Question 1

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

Accepted Answer

Salt dissolved in water

Question 2

Which statement best distinguishes a compound from an element?

Accepted Answer

A compound contains two or more elements chemically combined in a fixed ratio, while an element contains only one type of atom.

Question 3

How many oxygen atoms are present in one molecule of $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

6

Question 4

Which of the following changes is a chemical change?

Accepted Answer

Burning of wood

Question 5

A student measures the mass of a sample as $$12.34\ \mathrm{g}$$ and the volume as $$4.0\ \mathrm{mL}. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.1\ \mathrm{g/mL}$$

Question 6

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, while precision refers to how close measurements are to each other.

Question 7

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 8

Which of the following is a correct balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$} + 2\ \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\ \mathrm{H_2O}$$

Question 9

A patient receives a medication at a dose of $$0.250\ \mathrm{g}. $$How many milligrams is this?

Accepted Answer

$$250\ \mathrm{mg}$$

Question 10

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 11

A sample of gold has a mass of $$19.3\ \mathrm{g}$$ and a volume of $$1.00\ \mathrm{cm^3$}. $$What is its specific gravity?

Accepted Answer

$$19.3$$

Question 12

Which of the following best describes potential energy?

Accepted Answer

Energy stored due to position or composition

Question 13

Convert $$5.00\ \mathrm{cal} to $$joules. ($$1\ \mathrm{cal} = 4.184\ \mathrm{J})$$

Accepted Answer

$$20.9\ \mathrm{J}$$

Question 14

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 15

A nurse needs to convert a patient's temperature from $$102.2\ ^\circ\mathrm{F} to $$Celsius. What is the temperature in Celsius? ($$^\circ\mathrm{C} = ( ^\circ\mathrm{F} - 32 ) 	imes \frac{5}{9})$$

Accepted Answer

$$39.0\ ^\circ\mathrm{C}$$

Question 16

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

Accepted Answer

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

Question 17

Which of the following statements about the periodic table is correct?

Accepted Answer

Periods are horizontal rows and groups are vertical columns.

Question 18

A solution contains $$15\ \mathrm{g} of $$NaCl in $$85\ \mathrm{g} of $$water. What is the percent by mass of NaCl in the solution?

Accepted Answer

$$17.6\%$$

Question 19

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which one or more substances are converted into new substances with different properties.

Question 20

A sample of a liquid has a density of $$0.789\ \mathrm{g/mL}. $$What is the mass of $$250.0\ \mathrm{mL} of $$this liquid?

Accepted Answer

$$197.3\ \mathrm{g}$$

Chapter 1 Study Guide: Foundations of Matter and Measurement in GOB Chemistry

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