| Questions | Answer | Explanation |
1. Which electron transition represents a gain of energy?
A. from 2nd to 3rd shell
B. from 2nd to 1st shell
C. from 3rd to 2nd shell
D. from 3rd to 1st shell | A | All the other transitions are decreasing |
2. Which particles are found in the nucleus of an atom?
A. electrons, only
B. neutrons, only
C. protons and electrons
D. protons and neutrons | D | electrons are found outside the nucleus |
3. What is the total number of valence electrons in an atom of sulfur in the ground state?
A. 6
B. 8
C. 3
D. 4 | A | valence electrons are the outermost electrons sulfur 2-8-6 |
| 4. An electron has a charge of A. –1 and the same mass as a proton
B. +1 and the same mass as a proton
C. –1 and a smaller mass than a proton
D. +1 and a smaller mass than a proton | C | electron are negative and have very little mass compared to a proton or neutron |
| 5. The elements in the Periodic Table are arranged in order of increasing A. atomic number
B. atomic radius
C. mass number
D. neutron number | A | atomic numbers are the only consistant pattern atomic mass has a few hiccups |
| 6. What is the correct IUPAC name for the compound NH4Cl? A. nitrogen chloride
B. nitrogen chlorate
C. ammonium chloride
D. ammonium chlorate
| C | NH4+ ammonium Cl- chloride |
| 7. Which element is a solid at STP? A. H2
B. I2
C. N2
D. O2 | B | hydrogen nitrogen and oxygen are all gases Iodine solid at room STP melting points are on table S |
| 8. In which compound is the percent by mass of oxygen greatest? A. BeO
B. MgO
C. CaO
D. SrO | A | Be has the smallest mass therefore BeO has the greatest % mass of oxygen |
| 9. Based on Reference Table F, which of these salts is the best electrolyte? A. sodium nitrate
B. magnesium carbonate
C. silver chloride
D. barium sulfate
| A | nitrates are soluble all the others are insoluble |
| 10. What is conserved during a chemical reaction? A. mass, only
B. charge, only
C. both mass and charge
D. neither mass nor charge | C | everything is conserved in a chemical reaction mass, charge, energy |