Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture whose composition is the same throughout

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Boiling water to produce steam

Question 3

How many significant figures are in the measurement 0.04050 g?

Accepted Answer

4

Question 4

Which of the following is the correct balanced equation for the reaction of hydrogen gas with oxygen gas to form water?

Accepted Answer

$$2 \mathrm{H}_2 (g) + \mathrm{O}_2 (g) \rightarrow 2 \mathrm{H}_2\mathrm{O} (l)$$

Question 5

A patient’s body temperature is measured at 39.0 $$^{\circ}C. $$What is this temperature in Kelvin?

Accepted Answer

$$312.0\ \mathrm{K}$$

Question 6

Which of the following statements about density is correct?

Accepted Answer

Density is calculated as $$d = \frac{m}{V}$$

Question 7

Which of the following is a compound?

Accepted Answer

NaCl

Question 8

Convert 250 mL to liters using the correct conversion factor.

Accepted Answer

$$0.250\ \mathrm{L}$$

Question 9

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 10

A medication is prescribed at a dose of 5 mg/kg for a patient weighing 70 kg. What is the total dose required?

Accepted Answer

$$350\ \mathrm{mg}$$

Question 11

Which of the following is a correct statement about the periodic table?

Accepted Answer

A group is a vertical column of elements with similar chemical behaviors.

Question 12

What is the percent by mass of sodium in NaCl? (Na = 23.0 g/mol, Cl = 35.5 g/mol)

Accepted Answer

$$39\%$$

Question 13

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

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 14

A sample of a liquid has a mass of 24.0 g and a volume of 16.0 mL. What is its density?

Accepted Answer

$$1.50\ \mathrm{g/mL}$$

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

Iron

Question 17

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 18

A solution contains 5.0 g of glucose in 100 mL of solution. What is the percent (w/v) concentration?

Accepted Answer

$$5\%$$

Question 19

Which of the following is true about specific gravity?

Accepted Answer

It is the ratio of the density of a sample to the density of water and is unitless.

Question 20

Which of the following best describes kinetic energy?

Accepted Answer

The energy of motion

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

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