June 2022 Chemistry Regents #41-45
Highlight to reveal answers and explanations
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Questions |
Answer | Links |
Explanations |
41 Based on Table G, which solute sample in l00.g of
water at 40.°C can produce a solution equilibrium in a closed
system?
(1) 10.g KClO3 (3) 45 g KCl (2) 25 g NaCl (4) 55g KNO3 |
3 | equilibrium is
saturated...on the mass and temperature need to fall on the line
or in this case saturated with excess, so above the line (Hey 3 are below the line only 1 is above...that is how multiple choice works) |
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42 Given the equation representing a system at
equilibrium:
2SO2(g) + O2(g) <=> 2SO3(g) + energy Which change favors the forward reaction? (1) increasing the concentration of O2(g) (2) increasing the temperature (3) decreasing the pressure (4) decreasing the concentration of SO2(g) |
1 | LeChaterlier's principle
increasing a reactant shift to the right |
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43 When ice, H2O(s), melts at 0°C, entropy
increases because the
(1) average kinetic energy of the particles increases (2) average kinetic energy of the particles decreases (3) particle arrangement is more random (4) particle arrangement is less random |
3 | entropy is randomness,
based on how many different particle arrangements it can have
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44 At STP, propanal and propanone have different
chemical properties due to their different
(1) molecular masses (2) empirical formulas (3) percent compositions (4) functional groups |
4 | organic chem....these are isomers of each other and differ chemically because of functional groups | |
45 Given the formula for a compound:
What is the IUPAC name of the compound? (1) 2,3-dimethyloctane (2) 2,3-dimethylhexane (3) 4,5-dimethyloctane (4) 4,5-dimethylhexane |
2 | start numbering from the right | |
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