Question 1

Which of the following statements best explains why graphite and diamond, both made of carbon, have such different properties?

Accepted Answer

The atoms in graphite are arranged in sheets, while in diamond they are arranged in a three-dimensional structure.

Question 2

Which of the following is a chemical change?

Accepted Answer

Rusting of an iron nail.

Question 3

A sample of water is decomposed into hydrogen and oxygen. If 20.0 g of water produces 2.2 g of hydrogen, how much oxygen is produced?

Accepted Answer

$$17.8\ \mathrm{g}$$

Question 4

Which of the following best describes a scientific law?

Accepted Answer

A brief statement that summarizes past observations and predicts future ones.

Question 5

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 6

A student measures the mass of a lead block four times and gets values close to each other but far from the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

Convert $$38.7\ ^\circ\mathrm{C} to $$kelvins.

Accepted Answer

$$311.85\ \mathrm{K}$$

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

Tea with sugar

Question 10

Which temperature scale does not allow for negative values?

Accepted Answer

Kelvin

Question 11

A sample of copper is heated from room temperature to $$95\ ^\circ\mathrm{C}. $$What happens to its density?

Accepted Answer

The sample expands.

Question 12

Which of the following is the correct SI base unit for the amount of substance?

Accepted Answer

Mole (mol)

Question 13

Which prefix multiplier is most appropriate for reporting a measurement of $$5.57 	imes 10$$^{-5}$$\ \mathrm{m}$$?

Accepted Answer

Milli

Question 14

How many significant figures are in the measurement $$0.0000007160\ \mathrm{cm}^3$$?

Accepted Answer

4

Question 15

Which of the following best describes the difference between a law and a theory?

Accepted Answer

A law summarizes a series of related observations; a theory gives the underlying reasons for them.

Question 16

A graduated cylinder contains $$19.9\ \mathrm{mL} of $$water. After adding a piece of galena, the volume rises to $$24.5\ \mathrm{mL}. If $$the density of galena is $$7.6\ \mathrm{g/cm}^3$$, what is the mass of the galena?

Accepted Answer

$$35\ \mathrm{g}$$

Question 17

Which of the following is a physical property?

Accepted Answer

Melting point

Question 18

Which of the following best describes chemical energy?

Accepted Answer

Potential energy

Question 19

A student converts $$15\ \mathrm{cm} to $$inches using the conversion $$1\ \mathrm{in} = 2.54\ \mathrm{cm}. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$5.9\ \mathrm{in}$$

Question 20

Which of the following best describes the process of distillation?

Accepted Answer

A mixture is heated to boil off the more volatile liquid, which is then recondensed and collected.

Chapter 1: Matter, Measurement, and Problem Solving – General Chemistry Study Notes

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