Q: Which of the following is a correct energy conversion factor?

$$1\text{ Calorie} = 1\text{ kcal}$$

Question 1

Which of the following best describes why chemistry is often called 'the central science'?

Accepted Answer

Because it connects and underpins concepts in medicine, agriculture, food science, and many other fields.

Question 2

A student measures the mass of a sample as 12.305 g using a balance precise to the thousandth place. How many significant figures should be reported?

Accepted Answer

5 significant figures

Question 3

Which of the following is an example of a derived unit in the SI system?

Accepted Answer

cubic meter ($$m^3)$$

Question 4

A cube of copper has sides of 2.54 cm and a mass of 3.96 kg. What is the density of copper in $$g/cm^3$$? (1 kg = 1000 g)

Accepted Answer

$$2.44\ g/cm^3$

Question 5

Which temperature conversion formula is correct for converting Celsius to Kelvin?

Accepted Answer

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

Question 6

A student records the following measurements: 0.010 mL, 3.40 x $$10^2$$ mol, and 2 eggs. How many significant figures are in each measurement, respectively?

Accepted Answer

2, 3, infinite

Question 7

Which statement about significant figures is correct?

Accepted Answer

All nonzero digits are significant.

Question 8

A hand warmer releases heat to your hands. Which statement correctly describes the process?

Accepted Answer

It is exothermic; the system releases heat to the surroundings.

Question 9

Which of the following is the correct formula for converting Fahrenheit to Celsius?

Accepted Answer

$$^\circ C = (^\circ F - 32)/1.8$$

Question 10

A car is moving at 60.0 mph. What is its speed in m/s? (1 mile = 1609.3 m, 1 hour = 3600 s)

Accepted Answer

$$26.8\ m/s$$

Question 11

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 12

A sample of water is at $$9.0^\circ C. $$After an exothermic reaction, the temperature rises by $$3.12^\circ C. $$What is the final temperature, reported with the correct number of significant figures?

Accepted Answer

$$12.1^\circ C$$

Question 13

Which of the following is NOT a base SI unit?

Accepted Answer

liter (L)

Question 14

Which of the following statements about energy is correct?

Accepted Answer

Potential energy is associated with position or composition.

Question 15

A silver bar weighs 10.0 g. What is its volume if the density of silver is $$10.49\ g/cm^3$?

Accepted Answer

$$0.953\ cm^3$

Question 16

Which of the following is an example of an exact number in chemistry?

Accepted Answer

1 inch = 2.54 cm

Question 17

When multiplying or dividing measured quantities, how do you determine the number of significant figures in the final result?

Accepted Answer

Use the same number of significant figures as the factor with the fewest significant figures.

Question 18

Which of the following is a correct statement about dimensional analysis?

Accepted Answer

Units should be canceled out so that the final answer has the expected unit.

Question 19

Which of the following is a correct energy conversion factor?

Accepted Answer

$$1	ext{ Calorie} = 1	ext{ kcal}$$

General Chemistry I: Introduction, Measurement, and Problem Solving

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