Q: A $$1.75\ \mathrm{L}$$ sample of a liquid has a density of $$0.921\ \mathrm{g/mL}. $$What is its mass in grams?

$$1.61 \times 10^3$\ \mathrm{g}$$

Question 1

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

Accepted Answer

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

Question 2

A chemist observes that when a metal is burned in a closed container, the mass of the container and its contents does not change. This observation led to which scientific law?

Accepted Answer

Law of conservation of mass

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Iron rusts when exposed to oxygen.

Question 4

Which of the following changes is a physical change?

Accepted Answer

Evaporation of rubbing alcohol

Question 5

A sample of matter is composed of two types of atoms bonded together in a fixed ratio. Which classification best describes this sample?

Accepted Answer

Compound

Question 6

Which separation technique would be most appropriate for separating a mixture of sand and water?

Accepted Answer

Filtration

Question 7

Which of the following statements about energy is correct?

Accepted Answer

Energy is always conserved in a physical or chemical change.

Question 8

A student measures the mass of a gold nugget as $$22.5\ \mathrm{g}$$ and its volume as $$2.38\ \mathrm{cm}^3. $$What is the density of the nugget, and is it pure gold? (Density of gold is $$19.3\ \mathrm{g/cm}^3)$$

Accepted Answer

$$9.45\ \mathrm{g/cm}^3$$, not pure gold

Question 9

Which of the following is an intensive property?

Accepted Answer

Density

Question 10

Convert $$85.0\ ^\circ\mathrm{F} to $$Kelvin ($$K). $$Use $$^\circ\mathrm{C} = ( ^\circ\mathrm{F} - 32 ) / 1.8$$ and $$K = ^\circ\mathrm{C} + 273.15.$$

Accepted Answer

$$302.6\ \mathrm{K}$$

Question 11

Which temperature scale does NOT allow for negative temperatures?

Accepted Answer

Kelvin

Question 12

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

Accepted Answer

Micro

Question 13

A laboratory balance gives a reading of $$1.27\ \mathrm{g}$$ for a sample. The balance has markings every $$0.1\ \mathrm{g}. $$How many significant figures should be reported?

Accepted Answer

Three

Question 14

Which of the following numbers has four significant figures?

Accepted Answer

0.04450

Question 15

A student performs the calculation $$(43.998 	imes 0.00552) / 2.002$$ and reports $$0.12131. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$0.121$$

Question 16

A cube has an edge length of $$10\ \mathrm{cm}. $$What is its volume in $$\mathrm{cm}^3$$?

Accepted Answer

$$1000\ \mathrm{cm}^3$$

Question 17

A $$1.75\ \mathrm{L}$$ sample of a liquid has a density of $$0.921\ \mathrm{g/mL}. $$What is its mass in grams?

Accepted Answer

$$1.61 	imes 10^3$\ \mathrm{g}$$

Question 18

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 19

A scientist finds a large animal bone that cannot fit in a beaker. Which method would best approximate its density?

Accepted Answer

Estimate the volume by water displacement in a large container and measure the mass with a scale.

Question 20

Which of the following is a derived SI unit?

Accepted Answer

Cubic meter ($$\mathrm{m}^3)$$

Chapter 1: Matter, Measurement, and Problem Solving

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