Answer the questions using the "radio bullets" to the right.
Ignore questions and choices that aren't used, the form is standard.
Special Instructions (if any)
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. The most common elements in most living things are
a. oxygen, carbon, hydrogen, and calcium.
b. oxygen, carbon, hydrogen, and nitrogen.
c. oxygen, carbon dioxide, hydrogen, and nitrogen.
d. oxygen, carbon, sodium, and nitrogen.
____ 2. The nucleus is made up of
a. protons and electrons.
b. electrons and neutrons.
c. protons and neutrons.
d. protons, neutrons, and electrons.
____ 3. What type of ion forms when an atom loses electrons?
d. possibly positive or negative
____ 4. Identify the reactant(s) in the chemical reaction, CO2 + H2O H2CO3.
a. CO2, H2O, and H2CO3
b. CO2 and H2O
____ 5. Solutions that contain concentrations of H+ ions lower than pure water
a. have pH values below 7.
b. are acids.
c. are bases.
d. are enzymes.