hey

I am in need of your knowledge for I am soo dumb af


1. What are the products in the chemical equation given below?

Zn + CuSO4 → ZnSO4 + Cu

a. Zn & Cu
b. Zn & CuSO4

c. ZnSO4 & Cu
d. Zn only

2. The rate of reaction increases as the temperature increases. Which of the
following statements provides the best explanation for this?
a. At lower temperatures, the particles do not collide with each other.
b. At higher temperatures, the particles have more energy, move faster, and
collide more often.
c. Higher temperature has higher activation energy.
d. Increasing the temperature increases the number
of particles, so they collide more often.
3. Analyze the diagram on the right. What evidence shows
that the reaction’s product is a gas?
a. bubbles are forming and collected
b. the gas is not soluble in water
c. acids always produce gases when they react with
solids
d. there is no filter funnel and paper to remove
unreacted solid
4. Fresh fish and meat that are not stored in a refrigerator show signs of spoilage
in less than a day. What has caused this spoilage?
a. temperature changes
b. presence of microorganisms
c. oxygen in air
d. all of the above

5. In a reaction with hydrochloric acid, why does powdered magnesium react
faster than the same mass of magnesium ribbon?
a. The powdered magnesium contains more atoms than the magnesium
ribbon.
b. The powdered magnesium is hotter than the magnesium ribbon.
c. The powdered magnesium has a bigger surface area than the magnesium
ribbon.
d. The powdered magnesium has a smaller surface area than the magnesium
ribbon.
6. Marble reacts with hydrochloric acid to produce calcium chloride, water, and
carbon dioxide. In which of these mixtures is the rate of the reaction likely to
be the greatest?
a. 1 g of marble chips in 100cm3 of hydrochloric acid at 20°C.
b. 1 g of powdered marble in 100cm3 of hydrochloric acid at 30°C.
c. 1 g of powdered marble in 100cm3 of hydrochloric acid at 20°C.
d. 1 g of marble chips in 100cm3 of hydrochloric acid at 30°C.
7. Quicklime (CaO) is used as a drying agent. When water is added to this, slaked
lime Ca(OH)2 is formed. What type of reaction is this?
a. combination
b. single displacement
c. decomposition
d. double displacement
8. The following depicts the formation
of methanol (CH3OH). What would
be the skeleton equation for this
reaction?
a. C + Cl2 + O2 → CH3ClH
b. C + H2 + O2 → CH3OH
c. C2 + H2 + O2 → CH3OH
d. C + H + O → CH3OH
9. Which of the following is the correct balanced equation?
a. 2C3H8 + 10O2 → 6CO2 + 8H2O
b. C3H8 + O2 → CO2 + H2O
c. C3H8 + O2 → 3CO2 + 2H2O
d. C3H8 + 5O2 → 3CO2 + 4H2O
10.What is the function of MnO2 in the production of oxygen from hydrogen
peroxide in this reaction:
a. inhibitor
b. catalyst
c. temperature
d. concentration
11.An iron nail and iron filings are both exposed to moisture. Which do you think
is most likely to occur?
a. The iron nail and iron filings will remain the same.
b. The iron nail will rust faster than the iron filings.
c. The iron filings will rust faster than the iron nail.
d. The iron nail and iron filings will rust at the same rate.
For items 12-15, write T if the statement is true and F if otherwise.
12.At higher temperature, chemical reactions occur at slower rates.
13.Catalysts increase the rate of reaction by providing a reaction pathway with a
higher activation energy.
14.Generally, the higher the concentration of the reacting substances, the faster
is the reaction.
15.The minimum energy required to start a reaction is called bond energy.