Question 1

Which of the following best describes a chemical change?

Accepted Answer

A change that alters the composition of matter, resulting in the formation of new substances.

Question 2

A sample of water is heated from 25°C to 100°C. Which type of change does this represent?

Accepted Answer

Physical change

Question 3

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Decanting

Question 4

A student measures the mass of a cube as 12.0 g and its volume as 8.0 cm$$^3. $$What is the density of the cube?

Accepted Answer

$$1.4\ \mathrm{g/cm^3$}$$

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Sweetened tea

Question 6

Which statement about the states of matter is correct?

Accepted Answer

Solids have a constant shape and constant volume.

Question 7

A mixture of ethanol and water can be separated by which method?

Accepted Answer

Distillation

Question 8

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 9

A student records the following measurements for the mass of a ball: 2.3 kg, 2.4 kg, and 2.2 kg. The true mass is 1.0 kg. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 10

Which of the following numbers has three significant figures?

Accepted Answer

0.00340

Question 11

Convert 0.0587 L to mL.

Accepted Answer

$$587\ \mathrm{mL}$$

Question 12

Which of the following is an example of a pure substance?

Accepted Answer

Sodium chloride

Question 13

What is the SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 14

Which of the following changes is a phase change?

Accepted Answer

Melting of ice

Question 15

A cube has a length, width, and height of 3.0 cm each and a mass of 67.5 g. What is its density?

Accepted Answer

$$2.5\ \mathrm{g/cm^3$}$$

Question 16

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

Accepted Answer

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

Question 17

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeroes after a decimal point are significant.

Question 18

Which type of energy is associated with the position or composition of an object?

Accepted Answer

Potential energy

Question 19

A student multiplies 6.78 by 5.903 and then by (5.489 - 5.01). What is the correct way to handle significant figures in this multistep calculation?

Accepted Answer

Round only the final answer to the correct number of significant figures.

Question 20

Which of the following is NOT a physical property?

Accepted Answer

Toxicity

Introduction to Matter and Measurements – CHEM 1010 Study Notes

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