Kinetics Question Preview (ID: 62202)
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Which step below is rate-determining for a reaction with the following rate law: Rate = k|A|^2 |B|
a) Step 1: A + B = F
b) Step 2: F + A -- C + G
c) Step 3: G + A = C + D
d)
If I add vinegar to baking soda, a chemical reaction takes place and carbon dioxide is produced. Which of the following will increase the speed of the chemical reaction?
a) increase the temperature of the vinegar
b) decrease the concentration of the vinegar
c) decrease the surface area of the baking soda
d) use an inhibitor
The following chemical equation represents the decomposition of ammonia. 2NH3 -- 3H2 + N2 Which of the following is true in all chemical reactions that result in decomposition?
a) The mass of the products is less than the mass of the reactants.
b) The mass of the products is equal to the mass of the reactants.
c) The mass of the products is greater than the mass of the reactants.
d) The mass of the products is not related to the mass of the reactants.
David watches a burning candle to determine whether a chemical reaction is taking place. Which of these observations shows evidence of a chemical reaction?
a) The wax is melting.
b) The candle is in a glass jar.
c) The color of the candle is blue.
d) The candle gives off light and heat.
Roger combines vinegar with baking soda to demonstrate a chemical reaction. What should he be looking for to determine that a chemical reaction has occured?
a) formation of bubbles
b) a reduction in total mass
c) the disappearance of atoms
d) a solid turning to a liquid
in a chemical reaction, if more energy is required to make the chemical bonds than to break them apart, the reaction is endothermic, so we see a
a) decrease in temperature
b) huh?
c) no change in temperature
d) increase in temperature
A chemical reaction that releases is heat is what type of chemical reaction?
a) endothermic reaction
b) exothermic reaction
c)
d)
A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the compound is ionic?
a) Both the solid and the liquid are good conductors.
b) Both the solid and the liquid are poor conductors.
c) The solid is a good conductor, and the liquid is a poor conductor.
d) The solid is a poor conductor, and the liquid is a good conductor.
The empirical formula of a substance is CH2O. Its molar mass is 180. What is the molecular formula?
a) C2H4O2
b) C4H8O4
c) C6H12O6
d) C8H16O8
What is the molecular geometry of H2S?
a) tetrahedral
b) trigonal pyramidal
c) bent
d) T-shaped
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