Q: A hand warmer releases heat when activated. Which of the following correctly describes the sign of $$\\Delta E ($$change in energy) for the hand warmer (the system)?

$$\\Delta E is $$negative because energy is released.

Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

$$^\\circ F = (1.8 \\times ^\\circ C) + 32$$

Q: Which of the following is the correct conversion for $$1 \\mathrm{kWh} to $$joules?

$$1 \\mathrm{kWh} = 3.60 \\times 10^6$ \\mathrm{J}$$

Question 1

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

Accepted Answer

Because it connects and overlaps with many other scientific disciplines such as biology, physics, medicine, and environmental science.

Question 2

A student measures the mass of a sample as 12.30 g and its volume as 4.5 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.7 \ \mathrm{g/mL}$$

Question 3

Which of the following statements about significant figures is correct?

Accepted Answer

All nonzero digits in a measurement are significant.

Question 4

A recipe calls for 3 eggs, 250 g flour, and 500 mL milk. If you only have 2 eggs, how much flour and milk should you use to keep the proportions the same?

Accepted Answer

167 g flour, 333 mL milk

Question 5

Convert a temperature of $$-6^\circ \mathrm{C} to $$Kelvin.

Accepted Answer

$$267.15 \ \mathrm{K}$$

Question 6

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

Accepted Answer

The number of students in a classroom

Question 7

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

Accepted Answer

$$24.4 \ \mathrm{g/cm^3$}$$

Question 8

Which of the following best describes an exothermic process?

Accepted Answer

A process in which the system releases heat to the surroundings.

Question 9

A hand warmer releases heat when activated. Which of the following correctly describes the sign of $$\Delta E ($$change in energy) for the hand warmer (the system)?

Accepted Answer

$$\Delta E is $$negative because energy is released.

Question 10

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

Accepted Answer

$$^\circ F = (1.8 \times ^\circ C) + 32$$

Question 11

A student adds $$9.0^\circ \mathrm{C}$$ water to a solution, causing the temperature to rise by $$3.12^\circ \mathrm{C}. $$What is the final temperature, reported with the correct number of significant figures?

Accepted Answer

$$12.1^\circ \mathrm{C}$$

Question 12

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

Accepted Answer

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

Question 13

Which of the following numbers has three significant figures?

Accepted Answer

3.40 \times $$10^2$$

Question 14

A silver object weighs $$10.0 \mathrm{g}. If $$the density of silver is $$10.49 \mathrm{g/cm^3$}$$, what is its volume?

Accepted Answer

$$0.953 \mathrm{cm^3$}$$

Question 15

Which of the following is a correct statement about the scientific method?

Accepted Answer

It involves making observations, forming hypotheses, testing through experiments, and developing theories or laws.

Question 16

Which of the following is NOT a base SI unit?

Accepted Answer

Gram

Question 17

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

Accepted Answer

$$26.8 \mathrm{m/s}$$

Question 18

Which of the following is a correct statement about energy changes in chemical reactions?

Accepted Answer

Exothermic reactions release heat to the surroundings.

Question 19

Which of the following is the correct conversion for $$1 \mathrm{kWh} to $$joules?

Accepted Answer

$$1 \mathrm{kWh} = 3.60 \times 10^6$ \mathrm{J}$$

General Chemistry I: Introduction, Measurement, and Problem Solving

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