Q: Which of the following is the correct formula for specific gravity?

$$\text{Specific gravity} = \frac{\text{Density of substance (g/mL)}}{\text{Density of water at the same temperature (g/mL)}}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to air

Question 2

A sample of a substance is heated from 25°C to 75°C, and its mass remains unchanged. Which of the following statements is true?

Accepted Answer

The substance has undergone a physical change.

Question 3

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride (NaCl)

Question 4

A student dissolves sugar in water. Which type of change is this, and why?

Accepted Answer

Physical change, because the sugar and water retain their identities.

Question 5

Which of the following is the correct scientific notation for 0.000123?

Accepted Answer

$$1.23 	imes 10$$^{-4}$$

Question 6

How many significant figures are in the measurement 0.0170200 ft.?

Accepted Answer

6

Question 7

A patient weighs 98 kg and requires a medication with a dosage of 2.5 mg per 100.0 lb. The medication is available as a liquid with a concentration of 2.5 mg/mL. What volume of medication (in mL) should the patient receive? (1 kg = 2.205 lb)

Accepted Answer

4.4 mL

Question 8

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

Accepted Answer

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

Question 9

A gold sample has a mass of 1448 g and a volume of 75.0 mL. What is the density of the gold sample?

Accepted Answer

$$19.3\ \mathrm{g/mL}$$

Question 10

Which of the following best describes a mixture?

Accepted Answer

A blend of two or more pure substances in any ratio, each retaining its identity.

Question 11

Which of the following is the correct equation for calculating the amount of heat required to raise the temperature of a substance?

Accepted Answer

$$q = ms\Delta T$$

Question 12

A rug measures 34 in. by 42 in. What is the area of the rug in square feet? (1 ft = 12 in.)

Accepted Answer

9.9 ft$$^2$$

Question 13

Which of the following is an example of a physical property of baking soda?

Accepted Answer

It is a white, crystalline solid.

Question 14

Which of the following is the correct formula for specific gravity?

Accepted Answer

$$	ext{Specific gravity} = \frac{	ext{Density of substance (g/mL)}}{	ext{Density of water at the same temperature (g/mL)}}$$

Question 15

A sample of ethanol has a specific gravity of 0.787 at 25°C. If the density of water at this temperature is 0.997 g/mL, what is the density of ethanol?

Accepted Answer

$$0.785\ \mathrm{g/mL}$$

Question 16

Which of the following is the correct way to express 4,500,000,000 with two significant figures in scientific notation?

Accepted Answer

$$4.5 	imes 10$$^{9}$$

Question 17

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros to the left of the first nonzero digit are never significant.

Question 18

A box measures 2.20 in. by 4.00 in. by 6.00 in. How many cubic centimeters (cm$$^3) $$are in the box? (1 in. = 2.54 cm)

Accepted Answer

865 cm$$^3$$

Chapter 1: Measurement and the Properties of Matter – GOB Chemistry Study Notes

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