Q: Which of the following is a correct conversion factor for changing kilograms to grams?

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

Q: A sample of water is heated from 20$$^\circC to 80$^\circC. $$What is the temperature in Kelvin at the final state?

$$80 + 273.15 = 353.15\ \text{K}$$

Q: A student measures the mass of a sample as 2.50 g and its volume as 1.2 mL. What is the density of the sample?

$$\frac{2.50}{1.2} = 2.08\ \text{g/mL}$$

Q: A student wants to convert 654 kg to grams. Which calculation is correct?

$$654 \times 1000 = 654,000\ \text{g}$$

Question 1

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

Accepted Answer

Burning wood in a campfire

Question 2

A student mixes sand and salt in a beaker. Which classification best describes the resulting mixture?

Accepted Answer

Heterogeneous mixture

Question 3

Which property is intensive?

Accepted Answer

Density

Question 4

A cube has a side length of 4.00 cm and a mass of 256 g. What is its density?

Accepted Answer

$$\frac{256}{64.0} g/cm$^3$$

Question 5

Which of the following is a correct conversion factor for changing kilograms to grams?

Accepted Answer

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

Question 6

Which of the following is a physical property?

Accepted Answer

Melting point

Question 7

A sample of water is heated from 20$$^\circC to 80$^\circC. $$What is the temperature in Kelvin at the final state?

Accepted Answer

$$80 + 273.15 = 353.15\ 	ext{K}$$

Question 8

Which of the following is the correct scientific notation for 0.00000668?

Accepted Answer

$$6.68 	imes 10$$^{-6}$$

Question 9

A student measures the mass of a sample as 2.50 g and its volume as 1.2 mL. What is the density of the sample?

Accepted Answer

$$\frac{2.50}{1.2} = 2.08\ 	ext{g/mL}$$

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros in a decimal number are significant.

Question 11

A student wants to convert 654 kg to grams. Which calculation is correct?

Accepted Answer

$$654 	imes 1000 = 654,000\ 	ext{g}$$

Question 12

Which of the following is a pure substance?

Accepted Answer

Gold

Question 13

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

Accepted Answer

Micro

Question 14

A graduated cylinder contains 200 mL of water. After a metal object is submerged, the water level rises to 265 mL. What is the volume of the object?

Accepted Answer

$$265 - 200 = 65\ 	ext{mL}$$

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 16

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is chemically bonded, while a mixture is physically combined.

Question 17

A student adds 3.00 g of salt to 100.0 mL of water and stirs until dissolved. Which type of change has occurred?

Accepted Answer

Physical change

Question 18

Which formula correctly converts Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 19

Which of the following is an extensive property?

Accepted Answer

Mass

Question 20

A student multiplies 2.5 cm by 3.00 cm to calculate area. How many significant figures should the answer have?

Accepted Answer

2

Introduction to General Chemistry: Matter, Properties, and Measurement

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