Q: A cable is $$8.94 × 10^3 km $$long. Convert this length to meters using the correct number of significant figures.

$$8.94 \times 10^6$\ \mathrm{m}$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

Copper reacts with nitric acid to form a blue solution.

Question 2

A sample of matter changes from a solid to a liquid when heated. Which of the following statements is correct?

Accepted Answer

This is a physical change because only the state changes.

Question 3

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 4

A student measures the mass of a metal block as 25.0 g and its volume as 5.00 $$cm^3. $$What is the density of the block, and how many significant figures should the answer have?

Accepted Answer

$$5.00\ \mathrm{g/cm^3$}$$, 3 significant figures

Question 5

Which of the following processes is primarily a chemical change?

Accepted Answer

Iron rusting in moist air

Question 6

A cable is $$8.94 × 10^3 km $$long. Convert this length to meters using the correct number of significant figures.

Accepted Answer

$$8.94 	imes 10^6$\ \mathrm{m}$$

Question 7

Which of the following statements about energy is correct?

Accepted Answer

Energy is conserved and can be converted from one form to another.

Question 8

A thermometer reads 38.7°C. What is this temperature in Kelvin?

Accepted Answer

$$311.8\ \mathrm{K}$$

Question 9

Which of the following is an exact number?

Accepted Answer

The number of centimeters in a meter

Question 10

A student adds 23.28 mL and 83.5 mL of water. What is the correct sum, rounded to the proper number of decimal places?

Accepted Answer

$$106.8\ \mathrm{mL}$$

Question 11

Which of the following best describes the scientific approach to understanding nature?

Accepted Answer

Making observations, forming a hypothesis, conducting experiments, developing a model, and further testing.

Question 12

A piece of lithium has a mass of $$1.49 	imes 10^2$ mg and a volume of 2.76$$\ \mathrm{$$cm^3$$}$$. What is its density in $$\mathrm{$$g/cm^3$$}$$?

Accepted Answer

$$0.540\ \mathrm{g/cm^3$}$$

Question 13

Which of the following is a correct conversion factor for converting feet to miles?

Accepted Answer

$$\frac{1\ \mathrm{mi}}{5280\ \mathrm{ft}}$$

Question 14

A furniture factory uses bolts of fabric, each holding exactly $$200\ \mathrm{m^2$}. If$$ $$31.5\ \mathrm{ft^2$} of $$fabric is needed to upholster one chair, how many chairs can be upholstered with three bolts? ($$1\ \mathrm{m} = 3.281\ \mathrm{ft})$$

Accepted Answer

205 chairs

Question 15

Which of the following is a physical property of copper?

Accepted Answer

It can be drawn into wires.

Question 16

Which of the following statements about significant figures is correct?

Accepted Answer

All nonzero digits are always significant.

Question 17

A student subtracts $$2.8121\ \mathrm{mL}$$ from $$865.9\ \mathrm{mL}. $$What is the correct answer, rounded to the proper number of decimal places?

Accepted Answer

$$863.1\ \mathrm{mL}$$

Question 18

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

Accepted Answer

Precision is how close measurements are to each other; accuracy is how close measurements are to the actual value.

Question 19

Which of the following is an example of a systematic error?

Accepted Answer

A balance that always reads 0.5 g too high.

Keys to the Study of Chemistry: Fundamental Concepts, Measurement, and Problem Solving

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