Question 1

Which of the following statements is NOT a postulate of Dalton's atomic theory?

Accepted Answer

Atoms can be created or destroyed in a chemical reaction.

Question 2

Which experiment led to the discovery of the electron?

Accepted Answer

Cathode ray tube experiment

Question 3

Given the isotope $$^{14}_{6}\mathrm{C}$$, how many neutrons does it contain?

Accepted Answer

$$8$$

Question 4

Which law states that the elemental composition of a pure substance is always the same?

Accepted Answer

Law of Constant Composition

Question 5

Calculate the average atomic mass of magnesium given the following isotopic abundances: $$^{24}\mathrm{Mg} (78.99$$%, 23.99 amu), $$^{25}\mathrm{Mg} (10.00$$%, 24.99 amu), $$^{26}\mathrm{Mg} (11.01$$%, 25.98 amu).

Accepted Answer

$$24.31$$ amu

Question 6

Which of the following elements is a metalloid?

Accepted Answer

Silicon (Si)

Question 7

Which of the following is the empirical formula for hydrogen peroxide ($$\mathrm{H}_2\mathrm{O}_2$$)?

Accepted Answer

$$\mathrm{HO}$$

Question 8

Which of the following compounds is an ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 9

What is the charge on the ion formed by sulfur?

Accepted Answer

$$2-$$

Question 10

Which of the following is the correct name for $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 11

Which of the following is a diatomic element in its natural state?

Accepted Answer

$$\mathrm{O}_2$$

Question 12

What is the formula for the ionic compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al}_2\mathrm{O}_3$$

Question 13

Which of the following is the correct name for $$\mathrm{H}_2\mathrm{SO}_4$$?

Accepted Answer

Sulfuric acid

Question 14

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

Question 15

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 16

What is the correct formula for magnesium nitrate?

Accepted Answer

$$\mathrm{Mg(NO}_3)_2$$

Question 17

Which of the following is the correct name for $$\mathrm{CuSO}_4$$?

Accepted Answer

Copper(II) sulfate

Question 18

Which of the following is the correct name for $$\mathrm{Na}_2\mathrm{CO}_3 \cdot 10\mathrm{H}_2\mathrm{O}$$?

Accepted Answer

Sodium carbonate decahydrate

Question 19

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(\mathrm{NH}_4)_2\mathrm{SO}_4$$

Question 20

Which of the following best describes the difference between a molecular and an ionic compound?

Accepted Answer

Molecular compounds are formed between nonmetals; ionic compounds are formed between metals and nonmetals.

Atoms, Molecules, Ions, and Naming: Foundations of General Chemistry

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