Chemistry Practice Questions - Review Test #2
Try your skill.....test your knowledge.
Number your paper 1 - 15. All the following questions are multiple choice. Write your answer next to each number on your paper.
The answers to the questions are at the bottom of the quiz.
1. Matter is made of atoms that have positive centers of neutrons and protons surrounded by a cloud of negatively charged electrons. This statement is
| A. A theory. |
| B. a hypothesis |
| C. an inference. |
| D. an observation. |
2. When a metal is heated in a flame, the flame has a distinctive color. This information was eventually extended to the study of stars because.
| A. the color spectra of stars indicate which elements are present. |
| B. a red shift in star color indicates stars are moving away. |
| C. star color indicates absolute distance. |
| D. it allows the observer to determine the size of stars. |
3. Iodine would have chemical properties MOST like
| A. manganese (Mn) |
| B. tellurium (Te) |
| C. chlorine (Cl) |
| D. xenon (Xe) |
4. Electrical fires cannot be safely put out by dousing them with water. However, fire extinguishers that spray solid carbon dioxide on the fire work very effectively. This method works because carbon dioxide
| A. displaces the oxygen. |
| B. renders the fire's fuel non-flammable. |
| C. forms water vapor |
| D. blows the fire out with strong wind currents. |
5. In order to advance to the level of a theory, a hypothesis should be
| A. obviously accepted by most people. |
| B. a fully functional experiment |
| C. in alignment with past theories. |
| D. repeatedly confirmed by experimentation. |
6. Which of the following ordered pairs of elements shows an INCREASE in atomic number but a DECREASE in average atomic mass?
| A. Ag to Pd |
| B. Co to Ni |
| C. Ge to Sn |
| D. Cr to Mo |
7. Which of the following atoms has six valence electrons?
| A. magnesium (Mg) |
| B. silicon (Si) |
| C. sulfur (S) |
| D. argon (Ar) |
8. Which statement BEST describes the density of an atom's nucleus?
| A. The nucleus occupies most of the atom's volume but contains little of its mass. |
| B. The nucleus occupies very little of the atom's volume and contains little of its mass. |
| C. The nucleus occupies most of the atom's volume and contains most of its mass. |
| D. The nucleus occupies very little of the atom's volume but contains most of its mass. |
9. Some of the molecules found in the human body are NH2CH2COOH (glycine), C6H12O6 (glucose) and CH3(CH2)16COOH (stearic acid). The bonds they form are
| A. nuclear |
| B. metallic |
| C. ionic |
| D. covalent |
10. Which of the following elements has the same Lewis dot (valence) structure as silicon?
| A. germanium (Ge) |
| B. aluminum (Al) |
| C. arsenic (As) |
| D. gallium (Ga) |
11. Under the same conditions of pressure and temperature, a liquid differs from a gas because the molecules of the liquid
| A. have no regular arrangement. |
| B. are in constant motion. |
| C. have stronger forces of attraction between them. |
| D. take the shape of the container they are in. |
12. The random molecular motion of a substance is greatest when the substance is
| A. condensed. |
| B. a liquid. |
| C. frozen. |
| D. a gas. |
13. Of the four different laboratory solutions, the solution with the HIGHEST acidity has a pH of
| A. 11 |
| B. 7 |
| C. 5 |
| D. 3 |
14. Which of the following is an observable property of many acids?
| A. They become slippery when reacting with water. |
| B. They react with metals to release hydrogen gas. |
| C. They produce salts when mixed with other acids. |
| D. They become more acidic when mixed with a base. |
15. C3H8 + O2 CO2 + H2O
This chemical equation represents the combustion of propane. When correctly balanced, the coefficient for water is
| A. 2. |
| B. 4. |
| C. 8. |
| D. 16. |
ANSWERS:
| # | Answer |
| 1 | A |
| 2 | A |
| 3 | C |
| 4 | A |
| 5 | D |
| 6 | B |
| 7 | C |
| 8 | D |
| 9 | D |
| 10 | A |
| 11 | C |
| 12 | D |
| 13 | D |
| 14 | B |
| 15 | B |