Q: Convert 2000 micrometers ($$\mum) to $$millimeters (mm).

$$2000\ \mu\mathrm{m} \times \frac{1\ \mathrm{mm}}{1000\ \mu\mathrm{m}} = 2\ \mathrm{mm}$$

Q: Mt. Whitney has an average temperature of 44°F. Convert this temperature to Kelvin.

$$K = (44 - 32) \times \frac{5}{9} + 273.15 = 279.8\ \mathrm{K}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to oxygen

Question 2

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 4

Which of the following is a compound?

Accepted Answer

H$$_2O$$

Question 5

Which of the following is NOT a chemical change?

Accepted Answer

Dissolving sugar in water

Question 6

A cube of soil has a side length of 5 cm and a mass of 163 g. What is its density?

Accepted Answer

$$D = \frac{163\ \mathrm{g}}{125\ \mathrm{cm}^3} = 1.3\ \mathrm{g/cm}^3$$

Question 7

Convert 2000 micrometers ($$\mum) to $$millimeters (mm).

Accepted Answer

$$2000\ \mu\mathrm{m} 	imes \frac{1\ \mathrm{mm}}{1000\ \mu\mathrm{m}} = 2\ \mathrm{mm}$$

Question 8

Which of the following best explains why the ocean is considered a relatively homogeneous mixture?

Accepted Answer

It is composed of gases and salts that are uniformly mixed at the molecular level

Question 9

A cylinder of soil has a radius of 40 mm and a height of 6 cm. If its mass is 330 g, what is its density? (Use $$V = \pi r^2$ h$$ and $$1\ \mathrm{cm} = 10\ \mathrm{mm})$$

Accepted Answer

$$D = \frac{330\ \mathrm{g}}{301\ \mathrm{cm}^3} = 1.1\ \mathrm{g/cm}^3$$

Question 10

If you compress soil by adding compost, what happens to its density?

Accepted Answer

The density increases because the denominator (volume) decreases while mass stays the same

Question 11

Which of the following is an example of a real-world application of chemistry at the molecular level in environmental science?

Accepted Answer

Understanding the different forms of nitrogen in the environment and their impact on plant growth

Question 12

Which of the following best describes the difference between heat and temperature?

Accepted Answer

Heat is the energy transferred due to a temperature difference, while temperature is a measure of the average kinetic energy of particles

Question 13

Mt. Whitney has an average temperature of 44°F. Convert this temperature to Kelvin.

Accepted Answer

$$K = (44 - 32) 	imes \frac{5}{9} + 273.15 = 279.8\ \mathrm{K}$$

Question 14

Which of the following is a heterogeneous mixture?

Accepted Answer

Soil

Question 15

Which of the following is an element?

Accepted Answer

O$$_2$$

Question 16

A sample of seawater has a mass of 95 g and a volume of 92 mL. What is its density?

Accepted Answer

$$D = \frac{95\ \mathrm{g}}{92\ \mathrm{mL}} = 1.03\ \mathrm{g/mL}$$

Introduction to Chemistry: Matter, Measurement, and Properties

Guida di studio - Domande di pratica

Study guide - Flashcard