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Chemistry, 07.10.2019 17:50 aidanfbussiness
Check my semester exam ! i have a flight to must submit !
question 1 (multiple choice worth 2 points)
[07.06]what is the major difference between nuclear and chemical reactions?
only chemical reactions release energy.
only chemical reactions release gamma rays.
only nuclear reactions involve the exchange of electrons.
i picked: only nuclear reactions change the identity of an element.
question 2 (multiple choice worth 2 points)
[07.03]when water is added to an erlenmeyer flask and then sealed, phase equilibrium occurs. which answer explains the resulting dynamic equilibrium?
rate of evaporation = rate of precipitation
i picked: rate of condensation = rate of evaporation
moles of vapor = moles of liquid
moles of vapor = moles of solid
question 3 (multiple choice worth 2 points)
[05.01]which phase of matter is made up of particles that are packed closely together, with both a definite shape and a definite volume?
gas
liquid
plasma
i picked: solid
question 4 (multiple choice worth 2 points)
[06.02]when sulfuric acid is poured on sugar the volume of sugar expands and the sugar turns black and becomes very hot. which of the following best describes this reaction?
endothermic
i picked: exothermic
decomposition
synthesis
question 5 (multiple choice worth 2 points)
[07.01]which of the following is not true of acids?
acids are corrosive.
i picked: acids feel slippery.
acids have a sour taste.
acids have more hydronium ions than hydroxide ions.
question 6 (multiple choice worth 2 points)
[06.04]according to the collision theory, what is the best explanation for why a higher temperature makes a reaction go faster?
there are fewer collisions per minute.
it increases the distance between the particles.
it decreases the average kinetic energy of the particles.
i picked: it increases the average kinetic energy and number of collisions per minute.
question 7 (multiple choice worth 2 points)
[07.02]which of the following represents pure water?
[h3o+] > [oh-]
[h3o+] < [oh-]
i picked: [h3o+] = [oh-]
[h3o+] [oh-] = 14
question 8 (multiple choice worth 2 points)
[07.06]which of the following types of radiation can penetrate the most deeply into your body?
alpha rays
beta rays
i picked: gamma rays
proton rays
question 9 (multiple choice worth 2 points)
[07.05]in the chemical reaction shown below, which element was oxidized?
2k + cl2 yields 2kcl
i picked: k, because it lost one electron
k, because it gained one electron
cl, because it lost one electron
cl, because it gained one electron
question 10 (multiple choice worth 2 points)
[06.02]on an exothermic potential energy diagram, what is true for the products?
the products are at the same energy level as the reactants.
i picked: the products are at a lower energy level than the reactants.
the products are at a higher energy level than the reactants.
the products do not have energy.
question 11 (multiple choice worth 2 points)
[07.02]what is the salt formed in the following neutralization reaction?
mg(oh)2 + hcl yields h2o + mgcl2
mg(oh)2
hcl
h2o
i picked: mgcl2
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