Q: Express $$0.000000120\ \mathrm{m} in $$scientific notation with the correct number of significant figures.

$$1.20 \times 10$$^{-7}$$\ \mathrm{m}$$

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 has a definite volume but no definite shape. Which state of matter does this describe?

Accepted Answer

Liquid

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Saltwater

Question 4

Which of the following statements about chemical symbols is correct?

Accepted Answer

Some symbols are based on Latin names, such as $$\mathrm{Na}$$ for sodium.

Question 5

Which of the following is the correct chemical formula for a compound containing two hydrogen atoms and one oxygen atom?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$

Question 6

A patient’s body temperature is measured as $$104\ ^\circ\mathrm{F}. $$What is this temperature in degrees Celsius? (Use $$^\circ\mathrm{C} = \frac{5}{9}(^\circ\mathrm{F} - 32))$$

Accepted Answer

$$40.0\ ^\circ\mathrm{C}$$

Question 7

How many significant figures are in the measurement $$0.00760\ \mathrm{g}$$?

Accepted Answer

3

Question 8

Express $$0.000000120\ \mathrm{m} in $$scientific notation with the correct number of significant figures.

Accepted Answer

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

Question 9

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

Accepted Answer

$$0.80\ \mathrm{mL}$$

Question 10

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 force of gravity on that object.

Question 11

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

Accepted Answer

$$54.6\ \mathrm{cm}$$

Question 12

How much energy (in calories) is required to heat $$95\ \mathrm{kg} of $$water from $$15\ ^\circ\mathrm{C} to$$ $$40\ ^\circ\mathrm{C}$$? (Specific heat of water $$= 1.00\ \mathrm{cal/g\ ^\circ C})$$

Accepted Answer

$$2,375,000\ \mathrm{cal}$$

Question 13

A sample of isopropyl alcohol has a mass of $$25.0\ \mathrm{g}$$ and a density of $$0.7855\ \mathrm{g/mL}. $$What is its volume in mL?

Accepted Answer

$$31.8\ \mathrm{mL}$$

Question 14

Which of the following is an example of a derived SI unit?

Accepted Answer

Gram per cubic centimeter ($$\mathrm{g/cm^3$})$$

Question 15

A solution contains $$0.000101\ \mathrm{g} of $$iron. Express this value in micrograms ($$\mu\mathrm{g}). (1 g$$ = $$10^6$$\ \mu\mathrm{g}$$)

Accepted Answer

$$101\ \mu\mathrm{g}$$

Question 16

Which of the following statements about density and specific gravity is correct?

Accepted Answer

Specific gravity is the density of a substance divided by the density of water at the same temperature.

Question 17

A patient weighs $$160\ \mathrm{lb}. If $$the prescribed dosage of a drug is $$20\ \mu\mathrm{g/kg}$$, how many milligrams should the patient receive? (1 kg = 2.2 lb, 1 mg = 1000 $$\mug)$$

Accepted Answer

$$1.5\ \mathrm{mg}$$

Question 18

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 should have as many significant figures as the number with the fewest significant figures.

Question 19

Which of the following is a physical property?

Accepted Answer

Color

Chapter 1: Matter and Measurements – General Chemistry Study Notes

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