1. Which of the following represent isotopes?
a. C12 and C13 b. F-
and Cl- c. Ca++ and Mg++
d. H2O e. All of the above
represent isotopes
2. Decomposers are
a. dead, decaying matter that breaks down and nourishes living things
b. living things that use consumers as their source of energy
c. living things that use producers as their source of energy
d. living things that use dead producers and consumers as their source
of energy
e. living things that use the sunlight as their source of energy
3. Which of the following molecules has a polar covalent bond?
a. NH3 b. O2
c. NaCl d. H-H
4. Water tends to resist temperature change (increases very slowly)
due to
a. hydrogen bonds absorb a lot of energy
b. hydrogen bonds form more readily at higher temperatures
c. hydrogen bonds become more stable as the temperature increases
d. hydrogen bonds form between water and other molecules
e. all of the above are correct
5. The element F has 10 neutrons and a mass number = 19. How many
electrons are in its outermost shell?
a. 10 b. 3 c. 9
d. 7 e. cannot tell from the information given
6. All living things have?
a. RNA
b. At least one cell
c. The ability to move around in their environment
d. The ability to produce energy from the sun
e. None of the above are correct
7. An ionic bond is likely to form between two atoms that have the
following characteristics:
a. both need electrons to fill up the outermost shell
b. one needs an electron, one has a single electron, in the outermost
shell
c. anytime two atoms of the same element come together
d. both atoms have one or two electrons in the outermost shell
8. Lithium has an atomic number = 3. How many neutrons does it have?
a. 3 b. 6 c. 1
d. 9 e. cannot tell from the information given
9. Molecules with bonds tend to be hydrophobic.
a. ionic b. non-polar covalent
c. polar covalent d. hydrogen
10. Which of the following subatomic particles has a charge?
a. protons b. electrons
c. neutrons d. a & b are correct
e. all of the above are correct
Make sure to answer each question before checking that answers.