$$1 \text{ in.} = 2.54 \text{ cm}$$

$$q = m \times c \times \Delta T$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample of urine is analyzed and found to have regions with different compositions. How should this sample be classified?

Accepted Answer

Heterogeneous mixture

Question 3

Which of the following is the correct scientific notation for the number 0.000000120?

Accepted Answer

$$1.2 	imes 10$$^{-8}$$

Question 4

Which of the following is a physical property?

Accepted Answer

White crystalline appearance

Question 5

A cube measures 1.24 meters on each side. What is its volume in milliliters?

Accepted Answer

$$1.90 	imes 10^6$ mL

Question 6

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Saline solution

Question 7

How many significant figures are in the measurement 0.005400 cm?

Accepted Answer

4

Question 8

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

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

Question 9

A patient requires an injection of 0.012 g of a painkiller available as a 2.0 mg/mL solution. How many milliliters should be administered?

Accepted Answer

6.0 mL

Question 10

Which of the following statements about density is correct?

Accepted Answer

Density is mass divided by volume.

Question 11

Which of the following is the correct SI unit for measuring energy?

Accepted Answer

Joule (J)

Question 12

Which of the following is a sign of a chemical change?

Accepted Answer

Formation of a precipitate

Question 13

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 14

Which of the following is the correct conversion factor for changing inches to centimeters?

Accepted Answer

$$1 	ext{ in.} = 2.54 	ext{ cm}$$

Question 15

A 25.0 g sample of isopropyl alcohol has a density of 0.7855 g/mL. What is its volume?

Accepted Answer

$$31.8 	ext{ mL}$$

Question 16

Which of the following is the correct formula for calculating heat energy required to change the temperature of a substance?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 17

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 18

Which of the following is the correct metric prefix for $$10^{-6}$$?

Accepted Answer

micro-

Question 19

Which of the following best describes the process of condensation?

Accepted Answer

A gas turning into a liquid

Question 20

Which of the following elements is most abundant in the human body by mass?

Accepted Answer

Oxygen

Chapter 1: Matter and Measurements – GOB Chemistry Study Notes

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