Q: A student measures the mass of a sample as 12.30 g and its volume as 4.10 mL. What is the density of the sample, and how many significant figures should the answer have?

$$\text{Density} = \frac{12.30}{4.10} = 3.00\ \text{g/mL}$$, 3 significant figures

Q: A sample of ethanol has a mass of 39.5 g and a volume of 50.0 mL. What is its density?

$$\text{Density} = \frac{39.5}{50.0} = 0.790\ \text{g/mL}$$

Q: Convert 0.0056 kilometers to centimeters using conversion factors.

$$0.0056\ \text{km} \times \frac{1000\ \text{m}}{1\ \text{km}} \times \frac{100\ \text{cm}}{1\ \text{m}} = 560\ \text{cm}$$

Q: Which conversion factor would you use to convert grams to kilograms?

$$1\ \text{kg} = 1000\ \text{g}$$

Q: Which of the following is a correct example of dimensional analysis for converting 2.5 hours to seconds?

$$2.5\ \text{hr} \times \frac{60\ \text{min}}{1\ \text{hr}} \times \frac{60\ \text{s}}{1\ \text{min}} = 9000\ \text{s}$$

Question 1

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

Accepted Answer

Burning wood in a campfire

Question 2

Which property is considered extensive?

Accepted Answer

Volume

Question 3

A student measures the mass of a sample as 12.30 g and its volume as 4.10 mL. What is the density of the sample, and how many significant figures should the answer have?

Accepted Answer

$$	ext{Density} = \frac{12.30}{4.10} = 3.00\ 	ext{g/mL}$$, 3 significant figures

Question 4

Which of the following phase changes is irreversible under normal laboratory conditions?

Accepted Answer

Burning gasoline

Question 5

Which SI base unit is used to measure electric current?

Accepted Answer

Ampere

Question 6

A sample of ethanol has a mass of 39.5 g and a volume of 50.0 mL. What is its density?

Accepted Answer

$$	ext{Density} = \frac{39.5}{50.0} = 0.790\ 	ext{g/mL}$$

Question 7

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 8

Convert 0.0056 kilometers to centimeters using conversion factors.

Accepted Answer

$$0.0056\ 	ext{km} 	imes \frac{1000\ 	ext{m}}{1\ 	ext{km}} 	imes \frac{100\ 	ext{cm}}{1\ 	ext{m}} = 560\ 	ext{cm}$$

Question 9

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

Micro

Question 10

A student records a temperature of 25°C. What is this temperature in Kelvin?

Accepted Answer

$$T(K) = 25 + 273.15 = 298.15\ K$$

Question 11

Which of the following is an intensive property?

Accepted Answer

Density

Question 12

Which rule is correct for determining the number of significant figures in the measurement 0.00450 g?

Accepted Answer

Zeros between nonzero digits and trailing zeros after a decimal are significant

Question 13

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 14

A chemical reaction occurs in a sealed container. Which type of change is this most likely to be?

Accepted Answer

Irreversible chemical change

Question 15

Which of the following is the correct scientific notation for 0.00032?

Accepted Answer

$$3.2 	imes 10$$^{-4}$$

Question 16

Which of the following best describes a mixture?

Accepted Answer

A physical combination of two or more substances

Question 17

Which conversion factor would you use to convert grams to kilograms?

Accepted Answer

$$1\ 	ext{kg} = 1000\ 	ext{g}$$

Question 18

Which of the following is a correct example of dimensional analysis for converting 2.5 hours to seconds?

Accepted Answer

$$2.5\ 	ext{hr} 	imes \frac{60\ 	ext{min}}{1\ 	ext{hr}} 	imes \frac{60\ 	ext{s}}{1\ 	ext{min}} = 9000\ 	ext{s}$$

Question 19

Which of the following is a correct statement about physical and chemical properties?

Accepted Answer

Physical properties can be measured without changing the identity of the substance

Introduction to General Chemistry: Matter, Properties, and Measurement

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