Q: How many molecules are present in $$2.00$$ moles of water ($$\mathrm{H_2O}$$)?

$$1.20 \times 10$$^{24}$$ molecules

Q: A patient receives an intravenous solution containing $$0.90$$ grams of sodium chloride ($$\mathrm{NaCl}). $$How many sodium ions are present in the solution? (Molar mass of $$\mathrm{NaCl} = 58.5 g/$$mol, Avogadro's number $$= 6.02 \times 10$$^{23}$$)

$$9.3 \times 10$$^{21}$$ sodium ions

Question 1

Which of the following elements is classified as a metalloid based on its position on the periodic table?

Accepted Answer

Silicon (Si)

Question 2

Which group on the periodic table is known as the alkaline earth metals?

Accepted Answer

Group 2A

Question 3

What is the predicted ionic charge for an element in Group 7A of the periodic table?

Accepted Answer

$$-1$$

Question 4

How many molecules are present in $$2.00$$ moles of water ($$\mathrm{H_2O}$$)?

Accepted Answer

$$1.20 	imes 10$$^{24}$$ molecules

Question 5

A sample contains $$18.0$$ grams of glucose ($$\mathrm{C_6H_{12}O_6$}). $$What is the number of moles present? (Molar mass of $$\mathrm{C_6H_{12}O_6$} = 180.0 g/$$mol)

Accepted Answer

$$0.100$$ mol

Question 6

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

Sodium nitrate ($$\mathrm{$$NaNO_3$$})$$

Question 7

Which of the following is the empirical formula for hydrogen peroxide ($$\mathrm{H_2O_2}$$)?

Accepted Answer

$$\mathrm{HO}$$

Question 8

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 9

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 10

Calculate the percent composition by mass of oxygen in $$\mathrm{H_2SO_4} ($$Molar mass = $$98.0 g/$$mol).

Accepted Answer

$$65.3\%$$

Question 11

A compound is found to contain $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 12

A compound has an empirical formula of $$\mathrm{CH_2$}$$ and a molar mass of $$56 g/$$mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C_4H_8}$$

Question 13

Which of the following is NOT one of the seven diatomic elements?

Accepted Answer

Carbon ($$\mathrm{C_2$})$$

Question 14

In the chemical equation $$\mathrm{2H_2O(l) \rightarrow 2H_2(g) + O_2$(g)}$$, what does the symbol $$(l)$$ represent?

Accepted Answer

Liquid

Question 15

Balance the following chemical equation: $$\mathrm{C_3H_8(g) + O_2$(g) \rightarrow CO_2$(g) + H_2O(g)}$$

Accepted Answer

$$\mathrm{C_3H_8(g) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(g)}$$

Question 16

Which of the following best describes the products of the complete combustion of any hydrocarbon?

Accepted Answer

$$\mathrm{CO_2$(g)}$$ and $$\mathrm{H_2O(g)}$$

Question 17

Which of the following compounds is named correctly?

Accepted Answer

Dinitrogen tetroxide ($$\mathrm{N_2O_4})$$

Question 18

A patient receives an intravenous solution containing $$0.90$$ grams of sodium chloride ($$\mathrm{NaCl}). $$How many sodium ions are present in the solution? (Molar mass of $$\mathrm{NaCl} = 58.5 g/$$mol, Avogadro's number $$= 6.02 	imes 10$$^{23}$$)

Accepted Answer

$$9.3 	imes 10$$^{21}$$ sodium ions

Question 19

Which of the following best describes the type of bonding in metallic copper ($$\mathrm{Cu}$$)?

Accepted Answer

Metallic bonding with a 'sea of electrons'

General Chemistry Study Guide: Atoms, Elements, Compounds, and Chemical Reactions

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