Chemistry Department Mid-Term Questions
Test B
Select the ONE most correct response.
1.
The volume gradations on this lab equipment is used
a. to get a drink of water.
c. to make accurate measurements.
b. only to filter suspended solids.
d. only for “ballpark” estimates.
2. What happens to matter during a chemical reaction?
a.
Matter is neither destroyed nor created.
b.
Some matter is created.
c.
Some matter is destroyed.
d.
Some matter is destroyed and some is created.
3.
A variable in an experiment that does not change is
a.
a control variable.
b.
a manipulated variable.
c.
a responding variable.
d.
a scientific variable.
4. A variable in an experiment that responds to the change is
a.
a control variable.
b.
a manipulated variable.
c.
a responding variable.
d.
a scientific variable.
5. Which of the following is true for all chemical reactions?
a.
The total mass of the reactants equals the total mass of the products.
b.
The total mass of the products is greater than the total mass of the reactants.
c.
The total mass of the products is less than the total mass of the reactants.
d.
The total mass of the reactants increases.
6. Which of the following are considered physical properties of a substance?
a.
color and odor
c.
malleability and hardness
b.
melting and boiling points
d.
fermenting and gas production
7. How did Lavoisier transform the field of chemistry in the late 1700s?
a.
He transformed chemistry from a science of measuring to a science of observing.
b.
He transformed chemistry from a science of observing to a science of measuring.
c.
He concluded that oxygen was not necessary to burn candles.
d.
He concluded that phlogsten was necessary to burn candles.
8. Which of these steps should always be followed for effective problem solving?
a.
buying a larger quantity of material than estimated
b.
performing metric conversions
c.
developing a plan and then implementing the plan
d.
using a trial-and-error approach without considering the possible outcome
9. Which of the following is used to make measure liquid volume?
a.
c.
beaker
graduated cylinder
b.
d.
filtering funnel
Erlenmeyer flask
10. The subatomic particle with no charge is the:
a.
proton
b.
neutron
c.
electron
d.
scantron
11. How many protons are found in Copper-65?
a.
24
b.
27
c.
29
d.
65
e.
not enough information is given
12. How many neutrons are found in Silicon-30?
a.
2
b.
14
c.
16
d.
28
e.
30
13.
Read the graduated cylinder.
Use the measuring rule to decide what the volume is.
a.
50.61 mL
b.
56.52 mL
c.
50.6 mL
d.
56.5 mL
14.
Read the thermometer.
Use the measuring rule to decide what the temperature is.
a.
30.6 °C
b.
36.0 °C
c.
30.60 °C
d.
36.00 °C
15. What is the correct symbol for the isotope Oxygen-18?
a.
c.
b.
d.
Use the diagram below to answer questions 16 and 17.
16. Which picture to the left is a
mixture of elements?
17. Which picture to the left shows
pure compounds?
Use the diagram below to answer questions 18-19.
18. The atomic number is
a. 4
b. 3
c. 7
d. 9
19. The mass number is
a. 4
b. 3
c. 7
20. Which of the following is not a chemical change?
a. charcoal burning
b. newspaper yellowing in the sun
c. steel rusting
d. paper being shredded
21. What is the length of the bold line above?
a. 27.51 cm
b. 28.51 cm
c. 27.5 cm
d. 27 cm
d. 9
22. Convert 5.0 m to cm.
a. 50 cm
b. 5000 cm
c. 500 cm
d. 5 cm
Match the arrows to the correct choices for questions 23-25.
a. symbol
b. atomic number
c. average atomic mass
d. energy level
23.
24.
25.
26. Convert 45.0 mg to kg.
a. 0.0045 kg
b. 0.00045 kg
c. 0.000045 kg
d. 0.0000045 kg
Use the following passage and chart to answer questions 27-30.
Name
Carbon-12
Carbon-13
Carbon-14
Protons
6
6
6
Neutrons
6
7
8
Electrons
6
6
6
Mass
Number
12
13
14
Atoms are considered the basic building blocks of matter. The atom consists of a positively-charged
center, or nucleus, surrounded by negatively charged electrons. The major kinds of particles in the
nucleus are positively charged protons and negatively charged neutrons. The number of protons, called
the atomic number, identifies the element. The mass number of the atom represents the total number of
protons and neutrons. Not all atoms of an element are identical. The different atoms of an element are
called isotopes. The three carbon-isotopes are shown in the table above.
27. The atomic number of the element carbon is:
a. 6
b. 7
c. 12
d. 34
28. The three carbon-isotopes all have:
a. the same number of neutrons.
b. the same mass number.
c. an equal number of protons and electrons.
d. an equal number of neutrons and protons.
29. Carbon-13 has:
a. 6 protons and 7 electrons.
b. 7 protons and 6 electrons.
c. 6 protons and 7 neutrons.
d. 13 protons.
30. If the isotope of an element contains 8 protons, 9 neutrons, and 8 electrons, the atomic number and mass
number would be, respectively:
a. 8 and 17.
b. 9 and 17.
c. 8 and 26.
d. 9 and 26.