Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample of matter is uniform in appearance and composition, but can be separated into simpler substances by chemical means. How should this sample be classified?

Accepted Answer

Compound

Question 3

Which of the following statements about the three states of matter is correct?

Accepted Answer

A solid has a definite shape and definite volume.

Question 4

Which of the following is the correct chemical symbol for sodium?

Accepted Answer

Na

Question 5

A patient’s blood sample contains $$0.000101 g of $$iron. Express this quantity in micrograms ($$\mug) $$using scientific notation.

Accepted Answer

$$1.01 	imes 10$$^{2}$$ \mu g

Question 6

Which of the following measurements contains three significant figures?

Accepted Answer

0.0834 cm

Question 7

A clinical thermometer reads $$104.0^\circ F. $$What is this temperature in degrees Celsius ($$^\circ C$$)? Use the formula $$T_{C} = \frac{5}{9}(T_{F} - 32).$$

Accepted Answer

$$40.0^\circ C$$

Question 8

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object; weight is the gravitational force acting on that mass.

Question 9

A sample of isopropyl alcohol has a mass of $$25.0 g $$and a density of $$0.7855 g/mL. $$What is its volume in mL? Use the formula $$	ext{Volume} = \frac{	ext{Mass}}{	ext{Density}}.$$

Accepted Answer

$$31.8 mL$$

Question 10

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

Accepted Answer

Vanilla ice cream with chocolate chips

Question 11

A nurse needs to administer $$0.012 g of a $$drug available as $$15 mg/mL $$solution. How many mL should be given? (1 g = 1000 mg)

Accepted Answer

$$0.80 mL$$

Question 12

Which of the following best describes the concept of specific gravity?

Accepted Answer

The density of a substance divided by the density of water at the same temperature

Question 13

A child is 21.5 inches long at birth. How long is this in centimeters? (1 inch = 2.54 cm)

Accepted Answer

$$54.6 cm$$

Question 14

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

Accepted Answer

$$1.20 	imes 10$$^{-7}$$ m$

Question 15

A 95 kg bathtub of water is heated from $$20^\circ C to$$ $$45^\circ C. $$How many calories are required? (Specific heat of water = $$1.00$$ cal/g$$\cdot ^\circC)$$

Accepted Answer

$$2,375,000$$ cal

Question 16

Which of the following is the correct rule for determining the number of significant figures in the result of a multiplication or division calculation?

Accepted Answer

The answer has as many significant figures as the number with the fewest significant figures.

Question 17

A patient weighing 160 lb is to receive a drug at a dosage of $$20$$ $$\mug/kg $$body weight. How many milligrams should the patient receive? (1 kg = 2.2 lb, 1 mg = 1000 $$\mug)$$

Accepted Answer

$$1.6 mg$$

Question 18

Which of the following is a derived SI unit?

Accepted Answer

Density (kg/m$$^3)$$

Question 19

Which of the following statements about density is correct?

Accepted Answer

Density is mass divided by volume.

Chapter 1: Matter and Measurements – GOB Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard