Q: Which of the following is the correct formula for calculating the amount of heat absorbed or released by a substance?

$$q = m \times \Delta T \times \text{specific heat}$$

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 throughout and cannot be separated into simpler substances by physical means. Which classification best fits this sample?

Accepted Answer

Element or compound (pure substance)

Question 3

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

Accepted Answer

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

Question 4

A patient requires an injection of 0.012 g of a drug available as a 15 mg/mL solution. How many milliliters should be administered?

Accepted Answer

$$0.80 mL$$

Question 5

Which of the following statements about density is correct?

Accepted Answer

Density is the ratio of mass to volume.

Question 6

Convert 21.5 inches to centimeters. (1 inch = 2.54 cm)

Accepted Answer

$$54.6 cm$$

Question 7

Which of the following is a derived SI unit?

Accepted Answer

Meter per second (m/s)

Question 8

A body temperature of 107 °F is equivalent to approximately what temperature in Celsius?

Accepted Answer

$$42\ ^\circ\mathrm{C}$$

Question 9

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

Accepted Answer

Salt water

Question 10

How many significant figures are in the measurement 0.00760 mL?

Accepted Answer

4

Question 11

Which of the following equations correctly expresses the relationship between Celsius and Kelvin?

Accepted Answer

$$T_{\mathrm{K}} = T_{\mathrm{C}} + 273.15$$

Question 12

A 95 kg mass of water is heated from 15 °C to 40 °C. How much energy (in calories) is required? (Specific heat of water = 1.00 cal/g·°C)

Accepted Answer

$$2.4 	imes 10^6$ cal

Question 13

Which of the following is the correct formula for calculating the amount of heat absorbed or released by a substance?

Accepted Answer

$$q = m 	imes \Delta T 	imes 	ext{specific heat}$$

Question 14

Which of the following is a correct conversion factor for converting pounds to grams?

Accepted Answer

$$1\ \mathrm{lb} = 454\ \mathrm{g}$$

Question 15

A sample of isopropyl alcohol has a mass of 25.0 g and a density of 0.7855 g/mL. What is its volume?

Accepted Answer

$$31.8 mL$$

Question 16

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

Accepted Answer

Color

Question 17

Which of the following is the correct chemical formula for a compound containing 12 carbon, 22 hydrogen, and 11 oxygen atoms?

Accepted Answer

$$C_{12}H$$_{22}$$O_{11}$

Question 18

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 on that object.

Question 19

Which of the following is the correct value for the specific heat of water in SI units?

Accepted Answer

$$4.18\ \mathrm{J}/(\mathrm{g} \cdot ^\circ\mathrm{C})$$

Question 20

A solution is prepared by dissolving salt in water. Which term best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Chapter 1: Matter and Measurements – GOB Chemistry Study Notes

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