7C - Muscles and Bones: 1. The body needs oxygen (O2) to carry out cellular respiration and produce energy, and it also needs carbon dioxide (CO2) to eliminate waste from the body.
2. Breathing rate and pulse rate increase during physical activity to meet the increased oxygen demands of the body. This increase helps to supply oxygen to the muscles and remove CO2 from the body. During rest, breathing rate and pulse rate decrease as the oxygen demands of the body decrease.
3. A drug is any substance that alters the normal functioning of the body.
4. The human arm consists of three major bones: the humerus, radius, and ulna. The muscles that help move the arm include the biceps brachii, triceps brachii, brachialis, and brachioradialis.
5. Capillaries are small blood vessels with thin walls that allow for the exchange of gases, nutrients, and waste products between the blood and body tissues. Oxygen is stored in the red blood cells, and carbon dioxide is transported in the plasma and red blood cells.
7F - Acids and Alkalis
1. An acid is a substance that donates hydrogen ions (H+) in a solution, lowering its pH.
2. An alkali is a substance that accepts hydrogen ions (H+) in a solution, raising its pH.
3. A neutral substance has a pH of 7, indicating that it is neither acidic nor alkaline.
4. Litmus paper is a type of indicator that turns red in the presence of an acid and blue in the presence of an alkali.
5. A variable is any factor that can be changed or controlled in an experiment.
6. The reaction between an acid and an alkali is called a neutralization reaction.
7. Common word equations include: hydrochloric acid + sodium hydroxide → sodium chloride + water; sulfuric acid + calcium hydroxide → calcium sulfate + water.
8. Reactants are the substances that react in a chemical reaction, while products are the substances that are formed as a result of the reaction.
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Evaporation cools the liquid that is left behind because the molecules that leave the liquid during evaporation: A. have kinetic energy B.have greater than average speedeh C.Have broken the bonds that held them in the liquid. D. Create vapor pressure.
Create vapor pressure is behind because the molecules that leave the liquid during evaporation.
What is evaporation ?
The water cycle's crucial step is evaporation. When a liquid transforms into a gas, evaporation takes place. As rain puddles "disappear" on a hot day or when wet clothing dries in the sun, it is simple to envision. The liquid water in these instances is evaporating into a gas known as water vapor rather than actually dissipating.
What is kinetic energy ?
When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy.
Therefore, Create vapor pressure is behind because the molecules that leave the liquid during evaporation.
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ch 15 identify the bronsted lowry conjugate acid-base pair
a. NH3 NH4
b. H30 O OH
c. HCl HBr
d. ClO4 ClO3
NH₃/NH₄⁺ are a Bronsted-Lowry conjugate acid-base pair. The answer is a.
In a Bronsted-Lowry acid-base reaction, an acid donates a proton (H⁺) to a base, which accepts the proton. The species that donates the proton becomes the conjugate base, and the species that accepts the proton becomes the conjugate acid.
In option a, NH₃ is a base because it can accept a proton to form NH₄⁺, which is an acid because it can donate a proton to reform NH₃. Therefore, NH₃ and NH₄⁺ form a conjugate acid-base pair.
Option b shows a self-conjugate acid-base pair, where H₃O⁺ is an acid and can donate a proton to form H₂O, which is a base. However, H₂O can also donate a proton to form OH⁻, making it an acid. Therefore, H₃O⁺, H₂O, and OH⁻ are all part of the same conjugate acid-base pair.
Option c does not show a conjugate acid-base pair as both HCl and HBr are acids, and they cannot form each other by donating or accepting a proton.
Option d also does not show a conjugate acid-base pair because ClO₄⁻ and ClO₃⁻ are both oxyanions and cannot act as acids or bases in this context.
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The BLU-113A/B serves as the warhead for the a. GBU-32. b. CBU-107. c. GBU-15(V)1/B. d. GBU-28A/B and B/B.
The BLU-113A/B serves as the warhead for the GBU-28A/B and B/B. It is a penetrator bomb designed to penetrate hardened targets, such as underground bunkers and tunnels. The GBU-32 uses a different type of warhead, the BLU-109, which is also designed for penetrating targets.
The CBU-107 is a cluster bomb that disperses smaller bomblets, while the GBU-15(V)1/B is a guided bomb with a different type of warhead.
The BLU-109/B bomb is constructed with a thick, high-strength steel casing that enables it to withstand the extreme forces that occur during impact. The bomb typically features fins or wings that provide stability during flight and help guide it towards the intended target. When the bomb is released, it freefalls towards the target until it reaches the desired altitude, at which point the guidance system activates and steers the bomb towards the target.
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A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure?
a. sucrose
b. Al(ClO4)3
c. NaCl
d. KClO4
e. Ca(ClO4)2
To determine which 0.100 m solution will have the lowest vapor pressure, we need to consider the number of solute particles each substance will produce when dissolved in water. The more solute particles present, the lower the vapor pressure.
a. Sucrose: Since it is a non-electrolyte, it will not dissociate in water. Number of particles produced = 1.
b. Al(ClO₄)₃: When dissolved, it will dissociate into 1 Al³⁺ ion and 3 ClO₄⁻ ions. Number of particles produced = 1 + 3 = 4.
c. NaCl: When dissolved, it will dissociate into 1 Na⁺ ion and 1 Cl⁻ ion. Number of particles produced = 1 + 1 = 2.
d. KClO₄: When dissolved, it will dissociate into 1 K⁺ ion and 1 ClO₄⁻ ion. Number of particles produced = 1 + 1 = 2.
e. Ca(ClO₄)₂: When dissolved, it will dissociate into 1 Ca²⁺ ion and 2 ClO₄⁻ ions. Number of particles produced = 1 + 2 = 3.
The 0.100 m solution of Al(ClO₄)₃ (option b) will have the lowest vapor pressure, as it produces the highest number of solute particles (4) when dissolved in water.
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The endocrine system sends nerve impulses to control the activities of tissues and organs.
Group of answer choices
False
True
Answer: False
Explanation:
This statement is not entirely accurate. The endocrine system is a complex network of glands that secrete hormones into the bloodstream to regulate and control the activities of various tissues and organs in the body. Unlike the nervous system, which sends nerve impulses to specific cells or tissues to trigger a response, the endocrine system uses hormones to communicate with cells throughout the body.
Hormones are chemical messengers that travel through the bloodstream and bind to specific receptors on target cells, triggering a response. These responses can be slow and long-lasting, allowing the endocrine system to regulate many processes in the body, including growth and development, metabolism, reproductive functions, and stress responses.
Which one is considered to be the solvent if the solvent and the solute is present in equal amount in the solution?
If the solvent and solute are present in equal amounts in a solution, the solvent is still considered to be the substance that is capable of dissolving the solute.
A solvent is a substance that dissolves the solute and forms the solution. Even if the two substances are present in equal amounts, the solvent is still playing an active role in dissolving the solute. The substance known as the solvent is typically what determines whether a solution is in a solid, liquid, or gaseous state. The product that the solvent dissolves is known as the solute. A solvent is capable of dissolving the solute to form a solution and the solute is the substance that dissolves in a solvent giving rise to a solution.
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true or false 4) The primary source for the rising carbon dioxide levels is respiration of the Earth's growing population
Answer:
False
Explanation:
The primary source for the rising carbon dioxide levels is not respiration of the Earth's growing population. Carbon dioxide is primarily released into the atmosphere through the burning of fossil fuels such as coal, oil, and gas, as well as through deforestation and land use changes. While human respiration does release CO2 into the atmosphere, it is a much smaller factor compared to the other sources mentioned above. The amount of CO2 released by human respiration is balanced by the amount absorbed by plants during photosynthesis.
the carbon atom bonded to both the ring oxygen atom and a hydroxyl group is known as the
The carbon atom bonded to both the ring oxygen atom and a hydroxyl group is known as anomeric carbon.
In organic chemistry, the anomeric carbon is the carbon atom in a cyclic hemiacetal or hemiketal that is bonded to both an oxygen atom and a hydroxyl group. In the case of carbohydrates, the anomeric carbon is typically the carbon atom that was involved in the carbonyl group of the parent aldehyde or ketone prior to the formation of the cyclic hemiacetal or hemiketal.
The anomeric carbon is important in carbohydrate chemistry because it is often involved in glycosidic bond formation, which is how carbohydrates are linked together to form larger structures like polysaccharides. The configuration of the anomeric carbon (alpha or beta) also affects the physical and chemical properties of carbohydrates, including their solubility, reactivity, and biological activity.
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Complete the following equilibrium reaction and also predict whether the equilibrium lies to the left (Kc < 1) or to the right (Kc > 1):NO3- + H2O -->O2-+ H2O -->
The equilibrium lies to the left, with Kc < 1, favoring the reactants.
The given reaction is:
NO3- + H2O ⇌ O2- + H2O
First, let's complete the reaction. We need to balance the reaction by adding an H+ ion to the products side:
NO3- + H2O ⇌ O2- + H2O + H+
Now, we need to determine if the equilibrium lies to the left (Kc < 1) or to the right (Kc > 1). To do this, we need to analyze the stability of the reactants and products. NO3- is a stable ion since it is a conjugate base of a strong acid, HNO3. On the other hand, O2- is a very strong base, making it less stable. Therefore, the equilibrium will likely favor the more stable reactant side:
NO3- + H2O ⇌ O2- + H2O + H+ (Kc < 1)
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The following reaction is what type of chemical reaction?
Na + MgCl → NaCl + Mg
A. single replacement
B. combustion
C. Combination
D. double replacement
Answer:
A. Single replacement
Explanation:
Na replaces Mg as the cation
an herbicide contains only c , h , cl , and n . the complete combustion of a 150.0 mg sample of the herbicide in excess oxygen produced 156.9 ml of co2 and 91.52 ml of h2o vapor at stp. a separate analysis determined the 150.0 mg sample contained 41.36 mg cl . determine the percent composition of the herbicide.
The percent composition of the herbicide is 44.5% C, 6.27% H, 22.9% Cl, and 26.4% N.
To solve this problem, we will use the information provided to calculate the percent composition of the herbicide.
First, let's calculate the number of moles of CO2 and H2O produced by the combustion of the herbicide. We can use the ideal gas law to do this:
n_CO2 = (156.9 mL) / (22.4 L/mol) * (1 mol CO2 / 1 L) = 7.00 mol CO2
n_H2O = (91.52 mL) / (22.4 L/mol) * (1 mol H2O / 1 L) = 4.08 mol H2O
Next, let's calculate the number of moles of carbon, hydrogen, and nitrogen in the herbicide using the combustion reaction:
C_xH_yCl_zN_w + (x + y/4 - z/2) O2 → x CO2 + (y/2) H2O + z HCl + w NO2
From the balanced equation, we can see that the number of moles of CO2 produced is equal to the number of moles of carbon in the herbicide, and the number of moles of H2O produced is equal to the number of moles of hydrogen in the herbicide.
We can use this information to solve for the number of moles of carbon, hydrogen, and nitrogen in the herbicide:
n_C = 7.00 mol CO2
n_H = 8.16 mol H2O
n_Cl = 41.36 mg / 35.45 g/mol / 0.1500 g = 0.767 mol Cl
Since the herbicide contains no other elements besides C, H, Cl, and N, we can assume that the mass of the herbicide is equal to the sum of the masses of these elements. We can use this information to solve for the mass of the herbicide:
m_Herbicide = m_C + m_H + m_Cl + m_N
m_Herbicide = n_C * 12.01 g/mol + n_H * 1.008 g/mol + n_Cl * 35.45 g/mol + n_N * 14.01 g/mol
We can rearrange this equation to solve for the percent composition of the herbicide:
% C = (n_C * 12.01 g/mol / m_Herbicide) * 100% = 44.5%
% H = (n_H * 1.008 g/mol / m_Herbicide) * 100% = 6.27%
% Cl = (n_Cl * 35.45 g/mol / m_Herbicide) * 100% = 22.9%
% N = ((m_Herbicide - n_C * 12.01 g/mol - n_H * 1.008 g/mol - n_Cl * 35.45 g/mol) / m_Herbicide) * 100% = 26.4%
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Calculate the ratio of the concentration of acetic acid and acetate required in a buffer system at a pH of 4.208 (the pKa of acetic acid equals 4.752).
The required ratio of the concentration of acetate ([base]) to acetic acid ([acid]) in the buffer system at pH 4.208 is 0.318.
This means that for every molecule of acetic acid, there must be 0.318 molecules of acetate ions in the buffer solution.
The pH of a buffer system composed of a weak acid and its conjugate base can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([base]/[acid])
where pKa is the dissociation constant of the weak acid, [base] is the concentration of the conjugate base, and [acid] is the concentration of the weak acid.
We can rearrange this equation to solve for the ratio of [base]/[acid]:
[base]/[acid] = antilog(pH - pKa)
Substituting the given values, we get:
[base]/[acid] = antilog(4.208 - 4.752) = antilog(-0.544) = 0.318
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When solutes have a slightly -ve changes in free energy, will that dissolve or not?
The other factors can also influence the rate and extent of dissolution.
What is influence the rate and extent of dissolution?When solutes have a slightly negative change in free energy, they are likely to dissolve in a solvent.
Free energy is a measure of the amount of energy available to do work in a system. In the case of a solute dissolving in a solvent, the change in free energy is the difference in free energy between the solute and solvent before and after they come into contact.
If the overall change in free energy is negative, meaning the system has more energy available to do work after the solute dissolves in the solvent, then the solute is likely to dissolve.
In general, the solubility of a solute depends on several factors, including the strength of the intermolecular forces between the solute and solvent molecules, the temperature, and the pressure. When solutes have a slightly negative change in free energy.
it suggests that the intermolecular forces between the solute and solvent are favorable, making it easier for the solute to dissolve in the solvent.
It's important to note that a slightly negative change in free energy does not guarantee that the solute will dissolve completely or quickly.
The rate and extent of dissolution can depend on factors such as the solute concentration, agitation of the solution, and the presence of other solutes or impurities that may interfere with dissolution.
In summary, solutes with a slightly negative change in free energy are likely to dissolve in a solvent due to favorable intermolecular forces between the solute and solvent molecules.
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Use of SG to Calculate Weight (Mass) Using the SI System Must know the SG and the volume KNOW THIS Equation Grams = milliliters × SG Example Mass in grams of 2450 mL of ethanol (SG=0.810) 2450 mL × 0.810 = 1984.5 g
The mass of 2450 mL of ethanol with a specific gravity of 0.810 is 1984.5 grams.
The equation to calculate the mass (in grams) of a substance using its specific gravity (SG) and volume (in milliliters) in the SI system is:
Grams = milliliters × SG
For example, let's say you have 2450 mL of ethanol with a specific gravity of 0.810. To calculate the mass in grams, you would use the following equation:
Grams = 2450 mL × 0.810
Simplifying the equation, you get:
Grams = 1984.5 g
Therefore, the mass of 2450 mL of ethanol with a specific gravity of 0.810 is 1984.5 grams.
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How many moles of LiI are contained in 258.6 mL of 0.0296 M LiI solution?
Using the molarity formula, there are 0.00765 moles of LiI in 258.6 mL of 0.0296 M LiI solution.
Convert the given volume of 258.6 mL to liters by dividing by 1000: 258.6 mL ÷ 1000 mL/L = 0.2586 L. Use the molarity formula, M = moles of solute/liters of solution, to calculate the moles of LiI in the solution: 0.0296 M = moles of LiI / 0.2586 L
Rearranging the formula to solve for moles of LiI, we get moles of LiI = M x liters of the solution then moles of LiI = 0.0296 mol/L x 0.2586 L and moles of LiI = 0.00764576 mol. Round the answer to the appropriate number of significant figures, which in this case would be 3 since the given molarity has 3 significant figures: moles of LiI = 0.00765 mol.
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When two amino acids are joined via a peptide bond, what is the mass of the byproduct of this reaction? (Note: Assume that the amino acids were not modified by protecting groups.)
A.
17 amu
B.
18 amu
C.
32 amu
D.
44 amu
Assuming that protective groups did not alter the amino acids, dehydration causes peptide bonds to bind together, producing water H2O as a byproduct. The mass of H₂O is 18.
What do protecting groups on amino acids for peptide synthesis mean?The 9-fluorenyl methoxy carbonyl groups, employed as part of the respectively, methods, are the most popular -amino-protecting radicals for solid-phase peptide synthesis (SPPS).
How is the amino group of an amino acid protected in a peptide chain?By creating a Boc derivative, the amino group is shielded from damage. Dicyclohexylcarbodiimide (DCCI) is used to form an amide link between each of these protected amino acids. Trifluoroacetic acid is used to hydrolyze the Boc group in order to continue the peptide's extension.
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what is the purpose of adding anhydrous mgso4 to the ether solution ? what would occur if this step were omitted?
The purpose of adding anhydrous MgSO4 to the ether solution is to remove any remaining water from the solution. Water can interfere with the reaction or extraction process and cause unwanted side reactions or impurities. If this step were omitted, the presence of water in the ether solution could lead to undesirable results.
Anhydrous MgSO4 is a powerful desiccant that can absorb the water molecules from the solution, leaving it dry and free of moisture.
Water can react with some of the reagents or products, altering the yield or purity of the final product. Additionally, water can promote the growth of bacteria or other microorganisms in the solution, which can cause contamination and affect the safety of the process.
Therefore, adding anhydrous MgSO4 is an essential step in many chemical reactions and extractions that require a dry environment. It ensures that the solution is free of water and ready for the next step in the process.
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What would the concentration of sodium formate (NaCOOH) be in 0.00750 M formate buffer at pH 4.358?
The concentration of sodium formate in the buffer solution is 2.93 x [tex]10^{-3}[/tex] M.
To find the concentration of sodium formate in the buffer solution, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([NaCOOH] / [HCOOH])
Substituting the given values:
4.358 = 3.77 + log([NaCOOH] / 0.00750)
0.588 = log([NaCOOH] / 0.00750)
[NaCOOH] / 0.00750 = 3.91 x [tex]10^{-1}[/tex]
[NaCOOH] = 0.00750 x 3.91 x [tex]10^{-1}[/tex] = 2.93 x [tex]10^{-3}[/tex] M
Therefore, the concentration of sodium formate in the buffer solution is 2.93 x [tex]10^{-3}[/tex] M.
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ch 15 calculate the percent ionization of 1.45 M aquous acetic acid solution. for acetic acid Ka = 1.8 x 10^-5
a. .35%
b. .0018%
c. .29%
d. .0051%
The percent ionization of a 1.45 M aqueous acetic acid solution is approximately 1.19%.
Assuming that x is the extent of dissociation, the equilibrium concentrations of acetic acid, acetate ion, and hydrogen ion can be expressed as follows:
[CH3COOH] = (1.45 - x) M
[C2H3O2-] = x M
[H+] = x M
Ka = [H+] [C2H3O2-] / [CH3COOH]
[tex]1.8 * 10^-5 = x^2 / (1.45 - x)[/tex]
Since the extent of dissociation (x) is expected to be small compared to the initial concentration, we can approximate (1.45 - x) to 1.45 and solve for x using the quadratic formula:
[tex]x = [1.45 +/- sqrt(1.45^2 + 4 * 1.8 x 10^-5 * 1.45)] / 2 \\x = 0.0172 M (approx)[/tex]
Percent ionization:
% ionization = 1.19 %
Therefore, the percent ionization of a 1.45 M aqueous acetic acid solution is approximately 1.19%.
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--The Complete Question is , What is the percent ionization of a 1.45 M aqueous acetic acid solution?--
43) How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2
A) 310
B) 248
C) 1054
D) 351
E) not enough information
Rounding to the nearest gram, the answer is A) 310.
The balanced chemical equation is:
[tex]3Ca(NO_{3} )_{2}[/tex] + 2 Li3PO4 -> 6 LiNO3 + Ca3(PO4)2
The stoichiometry of the reaction shows that 3 moles of [tex]Ca(NO_{3} )_{2}[/tex] react with 2 moles of Li3PO4 to produce 1 mole of Ca3(PO4)2.
Given that 3.40 moles of [tex]Ca(NO_{3} )_{2}[/tex] and 2.40 moles of Li3PO4 are present, we can use the stoichiometry of the reaction to determine which reactant is limiting:
For [tex]Ca(NO_{3} )_{2}[/tex] : 3.40 moles [tex]Ca(NO_{3} )_{2}[/tex] x (1 mole Ca3(PO4)2 / 3 moles [tex]Ca(NO_{3} )_{2}[/tex] = 1.13 moles Ca3(PO4)2
For Li3PO4: 2.40 moles Li3PO4 x (1 mole Ca3(PO4)2 / 2 moles Li3PO4) = 1.20 moles Ca3(PO4)2
Since Li3PO4 produces more moles of Ca3(PO4)2 than [tex]Ca(NO_{3} )_{2}[/tex] it is the limiting reactant. Therefore, the maximum amount of Ca3(PO4)2 that can be produced is 1.20 moles.
The molar mass of Ca3(PO4)2 is 310.18 g/mol. Therefore, the theoretical yield of Ca3(PO4)2 is:
1.20 moles x 310.18 g/mol = 372.216 g
Rounding to the nearest gram, the answer is A) 310.
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Prevention/maintenance
Support of painful joints (eg arm slings, arm troughs, playboards) such as a painful shoulder, elbow, wrist or hand
Immobilization for healing or protection of tissues
Provide stability or restrict unwanted movement/motion
Prevention of contractures or normalising tone
Restoration
Restore mobility to joints
Prevention and maintenance of painful joints involves a variety of approaches, depending on the specific joint and the underlying cause of the pain. For example, arm slings, arm troughs, and playboards can be used to support and stabilize painful shoulders, elbows, wrists, and hands, while immobilization may be necessary for healing or protection of tissues.
In some cases, providing stability or restricting unwanted movement/motion can be beneficial, such as in the case of preventing contractures or normalizing tone.
To restore mobility to joints, a variety of techniques may be used, including physical therapy, stretching exercises, and joint mobilization. It's important to work with a healthcare professional to develop a personalized treatment plan that addresses your specific needs and goals. With proper care and management, it is often possible to improve mobility and reduce pain in painful joints.
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If radiation hits me that has more energy than required to emit an electron, what happens to the additional energy?
The photon will absorb the remaining energy because its frequency and wavelength match the extra energy.
What is radiation?The term radiation refers to energy which could be ionizing in nature. It consists of high frequency photons that move at the speed of light.
If radiation hits you that has more energy than required to emit an electron, the additional energy will be transferred to the emitted electron as kinetic energy.
This means that the electron will be emitted with a higher velocity (or speed) than if it had just enough energy to be emitted, but the electron itself will not gain any additional energy beyond that. The remaining energy will be carried away by the photon as its frequency and wavelength will correspond to the excess energy.
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QUESTION 6
How many grams of O₂ are used to produce 0. 72 liters of CO2 gas at standard temperature and pressure? __[a]___g
C3H8 +502->3CO2 + 4H₂O
Give the answer to 3 decimal places.
QUESTION 7
If 73. 0 g of aluminum chloride decomposes, how many molecules of chlorine gas are made?___ __[a]___x 1023
2AIC13 --> 2A1+ 3Cl2
Give the answer to two decimal places.
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6) The grams of the O₂ are used to produce 0.72 L of CO₂ gas at standard the temperature and the pressure is 0.10 g.
7) If 73 g of the aluminum chloride decomposes, the molecules of chlorine gas is 3.25 × 10²² molecules.
6) The chemical equation is as :
C₃H₈ + 5O₂ ----> 3CO₂ + 4H₂O
The ideal gas is as :
P V = n R T
Where,
The Pressure, P = 1 atm
The temperature, T = 273 K
The volume, V = 0.72 L
The gas constant, R = 0.823 L atm K⁻¹mol⁻¹
The moles, n = ?
n = P V / R T
n = ( 1 × 0.72 ) / 0.823 × 273
n = 0.0032 mol
The mass of the O₂ = moles × molar mass
The mass of the O₂ = 0.0032 × 32
The mass of the O₂ = 0.10 g
7) The chemical equation is :
2AICl₃ --> 2Al+ 3Cl₂
The mass of the AICl₃ = 73 g
The number of the moles of the AICl₃ = mass / molar mass
The number of the moles of the AICl₃ = 73 / 133.33
The number of the moles of the AICl₃ = 0.54 mol
The number of the molecules = 0.54 × 6.022 × 10²²
The number of the molecules of the AICl₃ = 3.25 × 10²² molecules.
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How many moles of oxygen are produced when 3.0 moles of potassium
chlorate decompose completely?
Balance this equation
_?_KClO4 → _?_KCl + _?_O2
Answer:
0.24
Explanation:
a.1 what volume of 0.3000 m hcl would contain 1.5000g of hcl (mw: 36.0g mol-1)? a) 12.5 ml b) 139 ml c) 16.2 l d) 180. l
The volume of 0.3000 M HCl required to contain 1.5000 g of HCl is b. 139 ml.
To calculate the volume of 0.3000 M HCl required to contain 1.5000 g of HCl.
we need to use the equation:
n = m/MW
Where n is the number of moles, m is the mass in grams, and MW is the molecular weight of HCl.
First, we need to calculate the number of moles of HCl in 1.5000 g of HCl:
n = 1.5000 g / 36.0 g/mol = 0.04167 mol
Next, we can use the equation:
C = n/V
Where C is the concentration in M, n is the number of moles, and V is the volume in liters.
Rearranging the equation, we get:
V = n/C
Plugging in the values, we get:
V = 0.04167 mol / 0.3000 mol/L = 0.1389 L
To convert liters to milliliters, we multiply by 1000:
V = 0.1389 L x 1000 mL/L = 138.9 mL
Therefore, the volume of 0.3000 M HCl required to contain 1.5000 g of HCl is 138.9 mL.
In summary, we used the mass of HCl and its molecular weight to calculate the number of moles. Then, we used the concentration of the HCl solution and the number of moles to calculate the volume of the solution required to contain the given mass of HCl. Therefore, the correct answer is option b.
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ch 15 what is the concentration of X^-2 in a .150 M solution of the diprotic acid H2X? For H2X Ka1= 4.5 x 1-^-6 and Ka2 = 1.2 x 10^-11
a. 9.9 -8
b. 2 -9
c. 8.2 -4
d. 1.2 -11
Answer:
a 87
Explanation:
b 56 c766 d77655
ch 17 find delta G for the reaction 2A + B ->2 from the given data
A---> B Delta G is 128
C--> 2B Delta G is 455
A--> C Delta G is -182
a. -401
b. 509
c. 401
d. -509
The Gibbs free energy for the reaction 2A + B → 2C is -401. The answer is a.
To find ΔG for the given reaction, we can use the Gibbs-Helmholtz equation:
ΔG_rxn = ΔH_rxn - TΔS_rxn
First, we need to find ΔH_rxn and ΔS_rxn for the reaction. We can do this by manipulating the given equations:
A → B: ΔG₁ = 128
C → 2B: ΔG₂ = 455
A → C: ΔG₃ = -182
Adding the equations for ΔG₁ and ΔG₂, we get:
C → A + B: ΔG = ΔG₁ + ΔG₂ = 583
Subtracting the equation for ΔG₃ from ΔG, we get:
2A + B → 2C: ΔG_rxn = ΔG - ΔG₃ = 401
Therefore, the ΔG for the reaction 2A + B → 2C is -401 kJ/mol. The answer is (a).
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You desire to create a solution with a pH of 3.26. If you add 0.577 moles of HF to 1.00 L of solution, how many moles of NaF should you add? Ka of HF: 7.2 x 10¯4
We need to add 1.45 x 10^6 moles of NaF to 1.00 L of the solution to prepare a buffer solution with a pH of 3.26.
To prepare a solution with a pH of 3.26 using HF and NaF, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([F-]/[HF])
where pKa is the acid dissociation constant of HF, [F-] is the concentration of the conjugate base NaF, and [HF] is the concentration of the acid HF.
We can rearrange this equation to solve for [F-]/[HF]:
[F-]/[HF] = antilog(pH - pKa)
Substituting the given values, we get:
[F-]/[HF] = antilog(3.26 - (-log(7.2 x 10^-4))) = antilog(3.26 + 3.14) = antilog(6.40) = 2.51 x 10^6
Therefore, the required ratio of [F-] to [HF] is 2.51 x 10^6. If we add 0.577 moles of HF to 1.00 L of solution, the concentration of HF will be:
[HF] = moles of HF / volume of solution = 0.577 mol / 1.00 L = 0.577 M
To calculate the moles of NaF needed, we can use the desired ratio of [F-] to [HF] and the known concentration of HF:
[F-]/[HF] = [NaF] / [HF]
2.51 x 10^6 = [NaF] / 0.577 M
[NaF] = 2.51 x 10^6 x 0.577 M = 1.45 x 10^6 mol/L
To prepare a 1.00 L solution with this concentration of NaF, we need to add:
moles of NaF = [NaF] x volume of solution = 1.45 x 10^6 mol/L x 1.00 L = 1.45 x 10^6 mol
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The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced 22.5 g of
aluminum. What is the percent yield for this reaction?
Al2O3 + 3C = 2Al + 3CO
A) 25.0 % B) 31.8 % C) 44.9 % D) 50.1 % E) 70.9 %
The percent yield for the reaction is approximately 50.1%. The correct answer is option D.
To determine the percent yield for this reaction, we'll first find the limiting reactant and then calculate the theoretical yield. Finally, we'll compare the theoretical yield to the actual yield (22.5 g of aluminum) to find the percent yield.
1. Calculate moles of reactants:
Al2O3: 60.0 g / (2 × 26.98 g/mol + 3 × 16.00 g/mol) ≈ 1.000 mol
C: 30.0 g / 12.01 g/mol ≈ 2.498 mol
2. Identify limiting reactant:
Since the stoichiometry is Al2O3 + 3C, we'll divide the moles of carbon by 3 and compare it to the moles of aluminum oxide:
(2.498 mol C) / 3 ≈ 0.833 mol
Since 0.833 mol < 1.000 mol, carbon is the limiting reactant.
3. Calculate theoretical yield:
Using the stoichiometry (2 mol Al produced per 3 mol C), we can calculate the theoretical yield of aluminum:
(2/3) × 2.498 mol C ≈ 1.665 mol Al
1.665 mol Al × 26.98 g/mol ≈ 44.9 g Al
4. Calculate percent yield:
Percent yield = (actual yield / theoretical yield) × 100
= (22.5 g Al / 44.9 g Al) × 100 ≈ 50.1%
For this reaction the percent yield is approximately 50.1%,
so the correct answer is D) 50.1%.
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Two or more substances in variable proportions, where the composition is variable throughout, is considered
Select one:
a. a compound.
b. a solution.
c. a homogeneous mixture.
d. an amorphous solid.
e. a heterogeneous mixture
Two or more substances in variable proportions, where the composition is variable throughout, is considered as Heterogeneous mixture.
The correct answer is:
e. a heterogeneous mixture
Two or more substances in variable proportions, where the composition is variable throughout, is considered a heterogeneous mixture. In a heterogeneous mixture, the substances are not evenly distributed and can be separated easily. Examples of heterogeneous mixtures include sand and water, oil and water, and salad.
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