Question 1

Which of the following best explains why water (H$$_2O) is a $$liquid at room temperature, while hydrogen (H$$_2) $$and oxygen (O$$_2) $$are gases, despite all being composed of small molecules?

Accepted Answer

Water molecules have stronger intermolecular forces (hydrogen bonding) compared to the weak London dispersion forces in H$$_2$$ and O$$_2.$$

Question 2

Given the reaction: $$2\ \mathrm{H}_2(g) + \mathrm{O}_2(g) \rightarrow 2\ \mathrm{H}_2\mathrm{O}(l)$$, what type of chemical bond is formed in the product?

Accepted Answer

Covalent bond

Question 3

Which of the following is the correct empirical formula for hydrogen peroxide?

Accepted Answer

$$\mathrm{HO}$$

Question 4

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 5

Which of the following compounds has the highest lattice energy based on the data provided?

Accepted Answer

$$\mathrm{ScN}$$

Question 6

What is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following best describes why solid NaCl does not conduct electricity, but its aqueous solution does?

Accepted Answer

In solid NaCl, ions are fixed in a lattice and cannot move, but in solution, ions are free to move and carry charge.

Question 8

Calculate the mass percent of nitrogen in $$\mathrm{Ca(NO}_3)_2 ($$molar mass = 164.10 g/mol).

Accepted Answer

$$17.07\ \%$$

Question 9

Which of the following is the correct formula for barium chloride hexahydrate?

Accepted Answer

$$\mathrm{BaCl}_2 \cdot 6\mathrm{H}_2\mathrm{O}$$

Question 10

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

Accepted Answer

Copper(II) sulfate

Question 11

What is the formula mass of $$\mathrm{CO}_2$$? (Atomic masses: C = 12.01 amu, O = 16.00 amu)

Accepted Answer

$$44.01\ \mathrm{amu}$$

Question 12

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 13

A sample of a compound contains 0.857 g of hydrogen and 6.86 g of oxygen. What is the empirical formula?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$

Question 14

Which of the following best describes the difference between an empirical formula and a molecular formula?

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms, while the molecular formula shows the actual number of atoms in a molecule.

Question 15

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

Accepted Answer

$$\mathrm{NH}_4\mathrm{NO}_3$$

Question 16

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds form between metals and nonmetals, while covalent bonds form between nonmetals.

Question 17

How many moles of Cl are present in 38.5 moles of $$\mathrm{CCl}_2\mathrm{F}_2$$?

Accepted Answer

$$77.0\ \mathrm{mol}$$

Question 18

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

Accepted Answer

Potassium sulfate

Question 19

Which of the following best explains why ionic compounds have high melting and boiling points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions in the lattice require a large amount of energy to break.

Chemical Bonding, Compounds, and Formula Calculations: Study Notes for General Chemistry

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