Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout, such as saltwater.

Question 2

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

Accepted Answer

Melting of ice to form liquid water.

Question 3

A sample contains only copper atoms. How would you classify this sample?

Accepted Answer

Element

Question 4

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

Accepted Answer

Groups are vertical columns and contain elements with similar chemical properties.

Question 5

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

Accepted Answer

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

Question 6

A patient’s body temperature is measured at 39.0 $$^\circC. $$What is this temperature in Fahrenheit? (Use $$F = 1.8C + 32)$$

Accepted Answer

$$102.2^\circ F$$

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning wood in a fireplace.

Question 8

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 9

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

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Question 10

A compound has the formula $$C_6H_{12}O_6$. How many atoms are present in one molecule of this compound?

Accepted Answer

24

Question 11

Which of the following is the correct conversion for 0.000000120 m to scientific notation?

Accepted Answer

$$1.20 	imes 10$$^{-7}$$ m

Question 12

A nurse needs to administer 250 mg of a drug. The available tablets are 0.10 g each. How many tablets should the nurse give? (1 g = 1000 mg)

Accepted Answer

2.5 tablets

Question 13

Which of the following statements about energy is correct?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 14

Which of the following is a correct statement about specific heat?

Accepted Answer

Specific heat is the amount of heat needed to raise the temperature of 1 gram of a substance by 1 $$^\circC.$$

Question 15

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

Accepted Answer

Iron

Question 16

A graduated cylinder contains 50.0 mL of water. A metal object is placed in the cylinder, and the water level rises to 62.5 mL. If the mass of the object is 100.0 g, what is its density?

Accepted Answer

$$8.00 	ext{ g/mL}$$

Question 17

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

Accepted Answer

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

Question 18

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition is not uniform throughout, such as a salad.

Question 19

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

Accepted Answer

$$2H_2(g) + O_2$(g) \rightarrow 2H_2O(l)$$

Question 20

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

Accepted Answer

$$\frac{8}{0.12} = 66.7$$ grams

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

Guida di studio - Domande di pratica

Study guide - Flashcard