Chemical Bonding
Chemical Reactions
Chemical Compounds
Atomic Energy
100
Atoms and the chemical bonds that connect them cannot be observed with your eyes, so it is necessary to use a: (a) model (b) theory (c) both a and b
(c) both a and b
100
Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an illustration of: (a) activation energy. (b) the law of conservation of mass. (c) a double-replacement reaction.
(b) the law of conservation of mass.
100
A solution that has a pH of ____ is neutral. (a) -1 (b) 7 (c) 14
(b) 7
100
Nuclear fusion: (a) produces more radioactive waste than nuclear fission. (b) requires temperatures over 100,000,000˚C. (c) is a more dangerous energy source than nuclear fission.
(b) requires temperatures over 100,000,000˚C.
200
The number of ____ is most important in determining how an atom will bond: (a) protons (b) neutrons (c) electrons in the outermost energy level
(c) electrons in the outermost energy level
200
The law of conservation of mass means that a chemical equation must show the same: (a) kind of atom on both sides of the arrow. (b) number of atoms on both sides of the arrow. (c) number AND kind of atom on both sides of the arrow.
(c) number AND kind of atom on both sides of the arrow.
200
When all the molecules of a compound break apart in water to produce hydrogen ions, the compound is considered to be a: (a) strong acid (b) weak acid (c) weak base
(a) strong acid
200
The generation of electrical energy by a nuclear power plant does NOT involve: (a) using uranium-235 as fuel. (b) a controlled chain reaction. (c) the production of carbon dioxide.
(c) the production of carbon dioxide.
300
Why do atoms have no charge? (a) The number of electrons is equal to the number of neutrons. (b) The number of protons is equal to the number of electrons. (c) There is an equal number of neutrons, protons, and electrons.
(b) The number of protons is equal to the number of electrons.
300
In which type of reaction do ions in two compounds switch places? (a) synthesis (b)decomposition (c) double-replacement
(c) double-replacement
300
An alkane is also a: (a) saturated hydrocarbon. (b) polyunsaturated hydrocarbon. (c) aromatic hydrocarbon.
(a) saturated hydrocarbon.
300
Which statement about nuclear fusion is NOT true? (a) Nuclear fusion is the joining of the nuclei of atoms. (b) Nuclear fusion is currently used to generate electrical energy. (c) Nuclear fusion uses hydrogen as fuel.
(b) Nuclear fusion is currently used to generate electrical energy.
400
Which of the following describes what happens when an atom becomes an ion with a 2– charge? (a) The atom gains 2 protons. (b)The atom loses 2 protons. (c) The atom gains 2 electrons.
(c) The atom gains 2 electrons.
400
A reaction in which two or more substances combine to form a single compound is a: (a) synthesis reaction. (b) single-replacement reaction (c) double-replacement reaction
(a) synthesis reaction.
400
A hydrocarbon in which each carbon atom in the molecule shares a single bond with each of four other atoms is a(n): (a) saturated hydrocarbon. (b) polyunsaturated hydrocarbon. (c) aromatic hydrocarbon.
(a) saturated hydrocarbon.
400
After four half-lives have passed, ____ of the original sample remains. (a) one-sixteenth (0.0625) (b) one-eighth (0.125) (c) none
(a) one-sixteenth (0.0625)
500
A chemical reaction in which energy is released or removed is: (a) exothermic. (b) a synthesis reaction. (c) a decomposition reaction.
(a) exothermic.
500
An increase in the amount of hydrogen ions in a solution ____ the pH. (a) lowers (b) does not effect (c) doubles
(a) lowers
500
The half-life of a radioactive atom is 2 months. If you start with 1 g of the element, how much will remain after 6 months? (a) One-half (0.5) of a gram will remain. (b) One-eighth (0.125) of a gram will remain. (c) None will remain.
(b) One-eighth (0.125) of a gram will remain.
M
e
n
u