Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Rocky road ice cream

Question 2

Which statement best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically joined together

Question 3

How many significant figures are in the measurement 0.00320 g?

Accepted Answer

3

Question 4

Which of the following is a chemical change?

Accepted Answer

A copper penny turning green

Question 5

Balance the following chemical equation: $$\mathrm{CH_4$(g) + O_2$(g) \rightarrow CO_2$(g) + H_2O(g)}$$

Accepted Answer

$$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g)}$$

Question 6

A patient receives 500 mL of IV fluid over 4 hours. What is the drip rate in mL/hour?

Accepted Answer

125 mL/hour

Question 7

Which of the following best describes the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 8

Convert 0.5 years to hours. (Assume 1 year = 365 days)

Accepted Answer

4380 hours

Question 9

Which of the following is the correct formula for calculating density?

Accepted Answer

$$\mathrm{Density = \frac{mass}{volume}}$$

Question 10

A sample has a mass of 25.0 g and a volume of 20.0 mL. What is its density?

Accepted Answer

1.25 g/mL

Question 11

Which of the following is NOT a property of a solid?

Accepted Answer

Particles are far apart and move freely

Question 12

A nutrition label states that a serving contains 8 g of fat, 4 g of protein, and 28 g of carbohydrate. What is the total mass of macronutrients per serving?

Accepted Answer

40 g

Question 13

Which of the following is the correct relationship between calories and joules?

Accepted Answer

$$1\ \mathrm{calorie} = 4.184\ \mathrm{joules}$$

Question 14

A child is prescribed a medication at a dose of 5 mg/kg. If the child weighs 18 kg, what is the total dose required?

Accepted Answer

90 mg

Question 15

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 16

A 50.0 g sample of water is heated from 20.0°C to 30.0°C. How much heat is absorbed? (Specific heat of water = $$1.00\ \mathrm{cal/g\cdot ^\circ C})$$

Accepted Answer

500 cal

Question 17

Which of the following best describes specific gravity?

Accepted Answer

The ratio of the density of a sample to the density of water

Question 18

Which of the following is the correct scientific notation for 0.00045?

Accepted Answer

$$4.5 	imes 10$$^{-4}$$

Question 19

A solution is prepared by dissolving 5.0 g of NaCl in enough water to make 250 mL of solution. What is the concentration in g/mL?

Accepted Answer

0.020 g/mL

Question 20

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Introduction to Chemistry: Matter and Measurement (CH 117, Sacred Heart University)

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