| 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 |