n did 6. When J. J. Thomson discovered the electron, he measure? A) its mass, m

Question

n did 6. When J. J. Thomson discovered the electron, he measure? A) its mass, m B) its charge, e C) its atomic number, z D) its temperature, T E) its charge-to-mass ratio, e/m 7. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? A) 11 B) 10 C) 21 D) 42 E) none of these 8. Atoms of the same element with different mass numbers are called A) chemical families. B) ions. C) isotopes. D) allotropes. E) neutrons. 9. An anion is defined as A) a group of stable atoms. B) an atom or group of atoms with a net positive charge C) a stable atom. D) a charged atom or group of atoms with a net negative charge. 10. A tentative explanation for a set of observations that can be tested by further experimentation is referred to as A) a law. B) a theory. C) a hypothesis. D) none of the above.

Explanation / Answer

6)

E) its charge to mass ratio , e/m

7)

the balanced reaction is

2 C7H14 + 21 O2 --> 14 CO2 + 14 H2O

so

the answer is C) 21

8)

atoms of the same element with different mass numbers are called isotopes

C) isotopes

9)

anions are a charged atom or group of atoms with a net negative charge

so the answer is D

10) By definition it is hypothesis

C) a hypothesis

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