Question 1

Which of the following compounds is correctly classified as molecular, and why?

Accepted Answer

IF7, because both elements are non-metals.

Question 2

Which of the following formulas is incorrect for an ionic compound, and what is the correct formula?

Accepted Answer

CaNO3, because Ca2+ and NO3- must combine in a 1:2 ratio. The correct formula is $$Ca(NO_3$)_2.$$

Question 3

A compound containing only C, H, and O is combusted, producing 2.49 g of CO2 and 0.65 g of H2O. What is the empirical formula of the compound?

Accepted Answer

$$C_1H_1O_1$$

Question 4

Which of the following is the correct process for determining the limiting reactant in a reaction?

Accepted Answer

Calculate the moles of each reactant and compare the mole ratios to the balanced equation.

Question 5

If 40,000 g of LiOH is available, how many moles of CO2 can be treated according to the reaction $$2LiOH + CO_2$ \rightarrow Li_2CO_3 + H_2O$$?

Accepted Answer

835 mol CO2

Question 6

A sample contains 0.072 mol H and 0.0566 mol C. If the total mass of the sample is 1.000 g, what is the mass of oxygen present?

Accepted Answer

0.247 g

Question 7

Which of the following is the correct empirical formula for a compound with the following mole ratios: C: 3.67, H: 4.68, O: 1.00?

Accepted Answer

$$C_{11}H$$_{14}$$O_3$$

Question 8

In the reaction $$Cu_2CO_3(OH)_2 + C \rightarrow 2CuO + CO_2$ + H_2O$$, if you start with 1.00 kg of $$Cu_2CO_3(OH)_2$$ and 1.00 kg of C, what is the theoretical yield of CuO?

Accepted Answer

8.6 mol

Question 9

If the percentage yield for the reaction $$Cu_2CO_3(OH)_2 \rightarrow CuO is 95$$%, how many moles of $$Cu_2CO_3(OH)_2$$ are required to produce 334 mol of CuO?

Accepted Answer

1.8 x $$10^2$$ mol

Question 10

Which of the following is a correct name for $$Fe($$MnO_4$$)_2$$?

Accepted Answer

Iron (II) manganate

Question 11

Which of the following statements about ionic compounds is correct?

Accepted Answer

Ionic compounds can contain polyatomic ions.

Question 12

What is the correct formula for a compound formed between Ca2+ and NO3- ions?

Accepted Answer

$$Ca(NO_3$)_2$$

Question 13

Which of the following is the correct name for $$P_4S_3$$?

Accepted Answer

Tetraphosphorus trisulfide

Question 14

If astronauts exhale 900,000 L of air per minute, how many hours can 40,000 g of LiOH treat for 4 astronauts?

Accepted Answer

200 hours

Question 15

Which of the following is a correct statement about empirical formulas?

Accepted Answer

Empirical formulas show the simplest whole-number ratio of atoms in a compound.

Question 16

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

Accepted Answer

$$(NH_4$)_3PO_4$$

Question 17

Which of the following is a correct statement about the reaction $$2LiOH + CO_2$ \rightarrow Li_2CO_3 + H_2O$$?

Accepted Answer

Two moles of LiOH are required to react with one mole of CO2.

Question 18

Which of the following is the correct name for CuBr2?

Accepted Answer

Copper (II) bromide

Question 19

Which of the following is a correct statement about percentage yield?

Accepted Answer

Percentage yield is calculated as (actual yield / theoretical yield) x 100%.

General Chemistry: Compound Classification, Formula Correction, Empirical Formulas, Stoichiometry, and Limiting Reactants

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