Q: What is the charge and approximate mass of a proton?

Charge: $$+1$$, Mass: $$1\ \text{amu}$$

Q: Which of the following compounds is named correctly?

$$\text{NaCl}$$: Sodium chloride

Question 1

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of substances present after a chemical reaction is the same as the mass before the reaction.

Question 2

According to Dalton’s Atomic Theory, which statement is INCORRECT?

Accepted Answer

Atoms are created and destroyed in chemical reactions.

Question 3

Which experiment led to the discovery of the electron?

Accepted Answer

Cathode ray tube experiment

Question 4

A sample of magnesium reacts with oxygen to form magnesium oxide. If 24 g of magnesium reacts with 16 g of oxygen, what is the mass of magnesium oxide formed?

$$	ext{Mg} + 	ext{O}_2 ightarrow 	ext{MgO}$$

Accepted Answer

$$40\ 	ext{g}$$

Question 5

Which law states that if two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in ratios of small whole numbers?

Accepted Answer

Law of Multiple Proportions

Question 6

Which scientist is credited with the discovery of the nucleus?

Accepted Answer

Ernest Rutherford

Question 7

What is the charge and approximate mass of a proton?

Accepted Answer

Charge: $$+1$$, Mass: $$1\ 	ext{amu}$$

Question 8

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 9

Calculate the atomic weight of chlorine if it consists of $$75.77\%$$ $$^{35}	ext{Cl} ($$mass $$= 34.969\ 	ext{amu}) $$and $$24.23\%$$ $$^{37}	ext{Cl} ($$mass $$= 36.966\ 	ext{amu}).$$

Accepted Answer

$$35.45\ 	ext{amu}$$

Question 10

Which of the following elements is a halogen?

Accepted Answer

Chlorine

Question 11

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

$$	ext{Mg(NO}_3)_2$$

Question 12

Which of the following is a diatomic molecule?

Accepted Answer

$$	ext{H}_2$$

Question 13

What is the name of the compound $$	ext{Fe}_2	ext{O}_3$$?

Accepted Answer

Iron(III) oxide

Question 14

Which of the following ions is a polyatomic ion?

Accepted Answer

$$	ext{SO}_4$$^{2-}$$

Question 15

Which of the following best describes the difference between molecular and empirical formulas?

Accepted Answer

Empirical formulas show the simplest whole-number ratio of atoms, while molecular formulas show the actual number of atoms in a molecule.

Question 16

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

Accepted Answer

Sulfuric acid

Question 17

Which of the following statements about the periodic table is TRUE?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 18

What is the charge on the sulfate ion?

Accepted Answer

$$-2$$

Question 19

Which of the following compounds is named correctly?

Accepted Answer

$$	ext{NaCl}$$: Sodium chloride

Question 20

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

Accepted Answer

$$	ext{Al}_2(	ext{SO}_4)_3$$

Atoms, Molecules, and Ions: Foundations of Atomic Theory and Chemical Nomenclature

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