Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Question 2

What is the correct formula for magnesium phosphate?

Accepted Answer

$$\mathrm{Mg}_3(\mathrm{PO}_4)_2$$

Question 3

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{KNO}_3$$

Question 4

A molecule of ammonia ($$\mathrm{NH}_3) $$has which molecular shape?

Accepted Answer

Trigonal pyramidal

Question 5

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH}_4$$)?

Accepted Answer

$$\mathrm{CH}_4 + 2\mathrm{O}_2 \rightarrow \mathrm{CO}_2 + 2\mathrm{H}_2\mathrm{O}$$

Question 6

Which intermolecular force is strongest in water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

Hydrogen bonding

Question 7

What is the molar mass of $$\mathrm{Na}_2\mathrm{CO}_3 ($$sodium carbonate)?

Accepted Answer

$$106\ \mathrm{g/mol}$$

Question 8

Which of the following best describes a double replacement reaction?

Accepted Answer

Two compounds exchange ions to form two new compounds.

Question 9

According to the Law of Conservation of Mass, which statement is true for a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products.

Question 10

Which of the following is the correct formula for zinc acetate?

Accepted Answer

$$\mathrm{Zn}(\mathrm{C}_2\mathrm{H}_3\mathrm{O}_2)_2$$

Question 11

Which gas law describes the relationship between pressure and volume at constant temperature?

Accepted Answer

Boyle's Law

Question 12

What is the correct formula for the ion formed by aluminum?

Accepted Answer

$$\mathrm{Al}^{3+}$$

Question 13

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO}_2$$

Question 14

A sample of gas has a volume of $$2.0\ \mathrm{L} at$$ $$1.0\ \mathrm{atm}. $$What will the volume be if the pressure is increased to $$4.0\ \mathrm{atm} at $$constant temperature?

Accepted Answer

$$0.5\ \mathrm{L}$$

Question 15

Which of the following is a correct statement about oxidation and reduction?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 16

What is the correct formula for calcium nitrate?

Accepted Answer

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

Question 17

Which of the following is true about the polarity of water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

Water is a polar molecule because it has a bent shape and unequal sharing of electrons.

Question 18

Which of the following is the correct formula for iron(III) phosphate?

Accepted Answer

$$\mathrm{Fe}_2(\mathrm{PO}_4)_3$$

Question 19

Which of the following is a property of gases according to the kinetic molecular theory?

Accepted Answer

Gas particles are in constant, random motion and have negligible volume compared to the container.

Chapters 6–8: Ions, Molecular Compounds, Chemical Reactions, and Gases – Study Notes

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