Q: Which equation correctly converts a temperature from Celsius to Kelvin?

$$K = \text{Temp}^\circ C + 273.15$$

Q: A patient weighs 154 lb. What is their mass in kilograms? (1 kg = 2.205 lb)

$$154 \text{ lb} \times \frac{1 \text{ kg}}{2.205 \text{ lb}} = 69.8 \text{ kg}$$

Q: A 15.0 g sample of an unknown solid is placed in a graduated cylinder containing 15.4 mL of water. The water level rises to 25.3 mL. What is the density of the solid?

$$\frac{15.0 \text{ g}}{25.3 \text{ mL} - 15.4 \text{ mL}} = 1.52 \text{ g/mL}$$

Q: Which of the following is the correct conversion factor to change 1 yard to centimeters? (1 yd = 3 ft, 1 ft = 12 in, 1 in = 2.54 cm)

$$1 \text{ yd} \times \frac{3 \text{ ft}}{1 \text{ yd}} \times \frac{12 \text{ in}}{1 \text{ ft}} \times \frac{2.54 \text{ cm}}{1 \text{ in}}$$

Q: A sample of gold has a mass of 38.6 g and a volume of 2.00 mL. What is its density?

$$\frac{38.6 \text{ g}}{2.00 \text{ mL}} = 19.3 \text{ g/mL}$$

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

$$\text{Specific gravity} = \frac{\text{Density of substance}}{\text{Density of water at the same temperature}}$$

Q: A 3.0 yard rope needs to be measured in centimeters. Using the following conversions: 1 yd = 3 ft, 1 ft = 12 in, 1 in = 2.54 cm, what is the length in centimeters?

$$3.0 \text{ yd} \times \frac{3 \text{ ft}}{1 \text{ yd}} \times \frac{12 \text{ in}}{1 \text{ ft}} \times \frac{2.54 \text{ cm}}{1 \text{ in}} = 274 \text{ cm}$$

Q: If 37 cal of heat is added to 3.0 g of water, what is the change in temperature? (Specific heat of water = 1 cal/g·°C)

$$\Delta T = \frac{q}{ms} = \frac{37 \text{ cal}}{3.0 \text{ g} \times 1 \text{ cal/g·}^\circ \text{C}} = 12.3^\circ \text{C}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 2

A sample of a substance is heated from 25°C to 75°C, and its mass remains unchanged. Which property is most likely to change?

Accepted Answer

Its density

Question 3

Which of the following is a pure substance?

Accepted Answer

Sodium chloride (NaCl)

Question 4

Which equation correctly converts a temperature from Celsius to Kelvin?

Accepted Answer

$$K = 	ext{Temp}^\circ C + 273.15$$

Question 5

A patient weighs 154 lb. What is their mass in kilograms? (1 kg = 2.205 lb)

Accepted Answer

$$154 	ext{ lb} 	imes \frac{1 	ext{ kg}}{2.205 	ext{ lb}} = 69.8 	ext{ kg}$$

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

7

Question 8

Which of the following best describes the state of matter for steam?

Accepted Answer

Indefinite shape and indefinite volume

Question 9

A 15.0 g sample of an unknown solid is placed in a graduated cylinder containing 15.4 mL of water. The water level rises to 25.3 mL. What is the density of the solid?

Accepted Answer

$$\frac{15.0 	ext{ g}}{25.3 	ext{ mL} - 15.4 	ext{ mL}} = 1.52 	ext{ g/mL}$$

Question 10

Which of the following is a chemical change?

Accepted Answer

Burning a candle

Question 11

What is the correct formula for calculating the amount of heat required to raise the temperature of a substance?

Accepted Answer

$$q = ms\Delta T$$

Question 12

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride (NaCl)

Question 13

A solution is prepared by dissolving 5.0 g of NaCl in 100 mL of water. What type of matter is this solution?

Accepted Answer

Mixture

Question 14

Which of the following is the correct conversion factor to change 1 yard to centimeters? (1 yd = 3 ft, 1 ft = 12 in, 1 in = 2.54 cm)

Accepted Answer

$$1 	ext{ yd} 	imes \frac{3 	ext{ ft}}{1 	ext{ yd}} 	imes \frac{12 	ext{ in}}{1 	ext{ ft}} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ in}}$$

Question 15

A sample of gold has a mass of 38.6 g and a volume of 2.00 mL. What is its density?

Accepted Answer

$$\frac{38.6 	ext{ g}}{2.00 	ext{ mL}} = 19.3 	ext{ g/mL}$$

Question 16

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

Accepted Answer

$$	ext{Specific gravity} = \frac{	ext{Density of substance}}{	ext{Density of water at the same temperature}}$$

Question 17

A 3.0 yard rope needs to be measured in centimeters. Using the following conversions: 1 yd = 3 ft, 1 ft = 12 in, 1 in = 2.54 cm, what is the length in centimeters?

Accepted Answer

$$3.0 	ext{ yd} 	imes \frac{3 	ext{ ft}}{1 	ext{ yd}} 	imes \frac{12 	ext{ in}}{1 	ext{ ft}} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ in}} = 274 	ext{ cm}$$

Question 18

If 37 cal of heat is added to 3.0 g of water, what is the change in temperature? (Specific heat of water = 1 cal/g·°C)

Accepted Answer

$$\Delta T = \frac{q}{ms} = \frac{37 	ext{ cal}}{3.0 	ext{ g} 	imes 1 	ext{ cal/g·}^\circ 	ext{C}} = 12.3^\circ 	ext{C}$$

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

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