Atoms Molecules and Ions Chemistry.docx - Atoms, Molecules,...

Atoms, Molecules, and Ions Chemistry
1) A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. This is
a statement of ________.
A) the law of multiple proportions
B) the law of constant composition
C) the law of conservation of mass
D) the law of conservation of energy
E) none of the above
Answer: B
2) Which one of the following is not one of the postulates of Dalton's atomic
theory?
A
3) Consider the following selected postulates of Dalton's atomic theory:
(i) Each element is composed of extremely small particles called atoms.
(ii) Atoms are indivisible.
(iii) Atoms of a given element are identical.
(iv)Atoms of different elements are different and have different properties.
Which of the postulates is(are) no longer considered valid?
C
4) Which pair of substances could be used to illustrate the law of multiple
proportions?
B

5) Which statement below correctly describes the responses of alpha, beta, and
gamma radiation to an electric field?
A) Both beta and gamma are deflected in the same direction, while alpha shows no
response.
B) Both alpha and gamma are deflected in the same direction, while beta shows no
response.
C) Both alpha and beta are deflected in the same direction, while gamma shows no
response.
D) Alpha and beta are deflected in opposite directions, while gamma shows no
response.
E) Only alpha is deflected, while beta and gamma show no response.
Answer: D
6) Which one of the following is not true concerning cathode rays?
E