Question 1

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

Accepted Answer

Brass (an alloy of copper and zinc)

Question 2

Which statement best describes a compound?

Accepted Answer

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

Question 3

Which of the following is the correct chemical formula for sodium chloride?

Accepted Answer

$$\mathrm{NaCl}$$

Question 4

A student measures the mass of a sample as 12.50 g and its volume as 5.00 mL. What is the density of the sample?

Accepted Answer

$$2.50\ \mathrm{g/mL}$$

Question 5

Which of the following changes is a chemical change?

Accepted Answer

Burning wood

Question 6

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 7

Convert 250 mL to liters using the correct conversion factor.

Accepted Answer

$$0.25\ \mathrm{L}$$

Question 8

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

Accepted Answer

$$\mathrm{K} = \mathrm{C} + 273$$

Question 9

A patient’s body temperature is measured as 102.2 °F. What is this temperature in Celsius?

Accepted Answer

$$39.0\ ^\circ\mathrm{C}$$

Question 10

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.

Question 11

Which of the following is NOT a property of gases?

Accepted Answer

Definite volume

Question 12

A medication is prescribed at 0.5 mg/kg for a patient weighing 70 kg. What is the total dose required?

Accepted Answer

$$35\ \mathrm{mg}$$

Question 13

Which of the following is the correct formula for density?

Accepted Answer

$$d = \dfrac{m}{V}$$

Question 14

Which of the following statements about the periodic table is TRUE?

Accepted Answer

Groups are vertical columns and periods are horizontal rows.

Question 15

A sample has a density of 0.85 g/mL. What is the specific gravity of the sample?

Accepted Answer

$$0.85$$

Question 16

Which of the following is the correct scientific notation for 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 17

Which of the following is a micronutrient essential for human health?

Accepted Answer

Iron

Question 18

If a chemical equation is not balanced, which of the following steps should be performed first?

Accepted Answer

Add coefficients to balance elements that appear only once on a side.

Question 19

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 20

A nutrition label states that a serving contains 8 g of fat, which is 12% of the daily value. What is the total daily value for fat in grams?

Accepted Answer

$$66.7\ \mathrm{g}$$

Chapter 1 Study Notes: Chemistry Basics—Matter and Measurement (GOB Chemistry)

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