Q: A patient is given 4.50 g of MgBr$$_2. $$How many anions are present?

$$2.94 \times 10$$^{22}$$ anions

Question 1

Which of the following best describes the process of a candle burning?

Accepted Answer

It is a chemical change because new substances are formed.

Question 2

A patient receives a dose of 2 μm of a medication. What is this length in meters?

Accepted Answer

$$2 	imes 10$$^{-6}$$ m

Question 3

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

NaBr

Question 4

A 43.6 g piece of metal has a density of 2.71 g/cm$$^3. $$What is its volume?

Accepted Answer

$$\frac{43.6}{2.71} = 16.1 cm$^3$$

Question 5

Which of the following is the correct empirical formula for a compound that is 62.0% C, 10.4% H, and 27.5% O by mass?

Accepted Answer

C3H6O

Question 6

A student mixes 3.00 g of ethanol ($$\mathrm{CH_3CH_2OH}) $$with water. How many moles of ethanol are present?

Accepted Answer

0.0652 mol

Question 7

Which of the following is a polyatomic molecule?

Accepted Answer

Phosphorus

Question 8

A person weighs 77.1 kg. What is their weight in pounds? (1 kg = 2.20462 lbs)

Accepted Answer

170 pounds

Question 9

Which of the following is NOT an empirical formula?

Accepted Answer

C2H4O2

Question 10

How many significant figures are in the measurement 463.090 m?

Accepted Answer

6

Question 11

Which of the following is the smallest volume?

Accepted Answer

22 cm$$^3$$

Question 12

What is the correct chemical formula for barium nitrite?

Accepted Answer

Ba(NO2)2

Question 13

Which of the following is a homogeneous mixture?

Accepted Answer

Cola

Question 14

A combustion analysis of a compound containing only C and H produces 0.2845 g of CO$$_2$$ and 0.1451 g of H$$_2O. $$What is the empirical formula?

Accepted Answer

C2H5

Question 15

Which of the following is an anion?

Accepted Answer

An atom that has gained an electron.

Question 16

What is the stoichiometric coefficient for oxygen when the following equation is balanced? 
$$\mathrm{C_2H_6O (l) + O_2$(g) \rightarrow CO_2$(g) + H_2O(l)}$$

Accepted Answer

3

Question 17

Which of the following sets contains species with the same number of electrons?

Accepted Answer

F-, Ne, Mg$$^{2+}$$

Question 18

A wine barrel holds 22.0 gallons. How many liters is this? (1 gal = 3.7854 L)

Accepted Answer

83.3 L

Question 19

Which of the following is the lowest temperature?

Accepted Answer

57°F

Question 20

A patient is given 4.50 g of MgBr$$_2. $$How many anions are present?

Accepted Answer

$$2.94 	imes 10$$^{22}$$ anions

General Chemistry Practice Exam 1 – Step-by-Step Study Guidance

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