Q: A sample of metal with a mass of 45.0 g is heated from $$25.0^\circC to$$ $$55.0^\circC$$, absorbing 675 J of heat. What is the specific heat capacity of the metal? Use $$q = mc\Delta T.$$

$$c = \dfrac{675}{45.0 \times 30.0} = 0.50 J/g$^\circC$$

Q: A sample of a liquid has a density of $$0.789 g/mL. $$What is the mass of $$250 mL of $$this liquid?

$$0.789 \times 250 = 197.25 g$$

Q: A patient’s body temperature is measured as $$102.2^\circF. $$What is this temperature in Celsius? Use $$^\circC$$ = $$(^\circF - 32$$) $$\times \dfrac{5}{9}.$$

$$(102.2 - 32) \times \dfrac{5}{9} = 39.0^\circC$$

Question 1

Which of the following numbers has the correct number of significant figures for the measurement 0.0045200 g?

Accepted Answer

6 significant figures

Question 2

A nurse needs to convert a patient's weight from pounds to kilograms for medication dosage. If the patient weighs 154 lb, what is the weight in kilograms? (1 kg = 2.205 lb)

Accepted Answer

$$154 \div 2.205 = 69.8 kg$$

Question 3

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not evenly distributed and can be seen as separate phases

Question 4

Which of the following is a chemical change?

Accepted Answer

Burning of gasoline in a car engine

Question 5

A sample of metal with a mass of 45.0 g is heated from $$25.0^\circC to$$ $$55.0^\circC$$, absorbing 675 J of heat. What is the specific heat capacity of the metal? Use $$q = mc\Delta T.$$

Accepted Answer

$$c = \dfrac{675}{45.0 	imes 30.0} = 0.50 J/g$^\circC$$

Question 6

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 7

A student measures the temperature of a solution as $$25.0^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$25.0 + 273.15 = 298.15 K$$

Question 8

Which of the following best explains why water has a higher specific heat capacity than most other substances?

Accepted Answer

Water has strong hydrogen bonds that require more energy to break.

Question 9

Which of the following is the correct electron configuration for a neutral atom of oxygen (atomic number 8)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 10

A sample of a liquid has a density of $$0.789 g/mL. $$What is the mass of $$250 mL of $$this liquid?

Accepted Answer

$$0.789 	imes 250 = 197.25 g$$

Question 11

Which of the following best describes the process of measuring a volume by displacement?

Accepted Answer

Measuring the change in water level when an object is submerged

Question 12

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 13

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is made of two or more elements chemically combined, while a mixture is a physical combination of substances.

Question 14

A patient’s body temperature is measured as $$102.2^\circF. $$What is this temperature in Celsius? Use $$^\circC$$ = $$(^\circF - 32$$) $$	imes \dfrac{5}{9}.$$

Accepted Answer

$$(102.2 - 32) 	imes \dfrac{5}{9} = 39.0^\circC$$

Question 15

Which of the following statements about protons, neutrons, and electrons is correct?

Accepted Answer

Neutrons have no charge and are found in the nucleus.

Question 16

Which of the following is the correct scientific notation for the number 0.00056?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 17

Which of the following best explains why metals heat up faster than water when exposed to the same amount of energy?

Accepted Answer

Metals have a lower specific heat capacity than water.

Question 18

Which of the following is a physical change?

Accepted Answer

Sublimation of dry ice (solid CO$$_2 to $$gas)

Question 19

A food label states that a serving contains 200 Calories. How many joules is this? (1 Calorie = 4184 J)

Accepted Answer

$$200 	imes 4184 = 836,800 J$$

Question 20

Which of the following best describes the difference between an element and a compound?

Accepted Answer

A compound is made of two or more elements chemically combined in a fixed ratio.

Fundamental Concepts in GOB Chemistry: Measurement, Matter, and Atomic Structure

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