Q: Express 0.000000120 m in scientific notation and using an appropriate metric prefix.

$$1.20 \times 10$$^{-7}$$\ \mathrm{m}$$ = $$120\ \mathrm{nm}$$

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 its components by physical means. Which classification best fits this sample?

Accepted Answer

Homogeneous mixture

Question 3

Which of the following is the correct chemical symbol for sodium, and what is its origin?

Accepted Answer

Na, from the Latin name natrium

Question 4

A patient’s 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

$$40\ ^\circ\mathrm{C}$$

Question 5

Which of the following measurements contains three significant figures?

Accepted Answer

0.0834 cm

Question 6

A nurse needs to administer 0.012 g of a medication. The medication is available as a solution containing 15 mg/mL. How many milliliters should be administered? (1 g = 1000 mg)

Accepted Answer

$$0.80\ \mathrm{mL}$$

Question 7

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 8

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

Accepted Answer

$$31.8\ \mathrm{mL}$$

Question 9

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

Accepted Answer

Vanilla ice cream with chocolate chips

Question 10

Express 0.000000120 m in scientific notation and using an appropriate metric prefix.

Accepted Answer

$$1.20 	imes 10$$^{-7}$$\ \mathrm{m}$$ = $$120\ \mathrm{nm}$$

Question 11

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

Accepted Answer

$$1.5\ \mathrm{mg}$$

Question 12

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

Accepted Answer

Specific gravity is the ratio of the density of a substance to the density of water at the same temperature.

Question 13

A clinical laboratory reports a blood sample contains 0.000101 g of iron. Express this value in micrograms ($$\mug). (1 g$$ = $$1 	imes 10^6$ $$\mu$$g)

Accepted Answer

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

Question 14

Which of the following is the correct relationship between Celsius and Kelvin temperature scales?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273.15$$

Question 15

How many significant figures are in the measurement 2730.78 m?

Accepted Answer

Six

Question 16

A bath uses 95 kg of water, which is heated from $$20\ ^\circ\mathrm{C} to$$ $$45\ ^\circ\mathrm{C}. $$How much energy in calories is required? (Specific heat of water = $$1.00\ \mathrm{cal/g\ ^\circ C}$$, 1 kg = 1000 g)

Accepted Answer

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

Question 17

Which of the following is a derived SI unit?

Accepted Answer

Meters per second ($$\mathrm{m/s})$$

Question 18

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

Accepted Answer

$$54.6\ \mathrm{cm}$$

Question 19

Which of the following best describes a physical property?

Accepted Answer

The melting point of ice

Chapter 1: Matter and Measurements – GOB Chemistry Study Notes

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