Q: Which of the following is the correct formula for density?

$$\\text{density} = \\frac{\\text{mass}}{\\text{volume}}$$

Q: A student needs to convert 2.5 kilometers to meters. Which conversion factor should they use?

$$1 \\ \mathrm{km} = 1000 \\ \mathrm{m}$$

Question 1

Which of the following best describes a scientific law?

Accepted Answer

A statement that is consistently and reproducibly observed, used to predict future events.

Question 2

A student measures the mass of a sample as 15.0 g and its volume as 3.0 mL. What is the density of the sample?

Accepted Answer

$$5.0 \ \mathrm{g/mL}$$

Question 3

Which of the following is the correct SI unit for temperature?

Accepted Answer

Kelvin (K)

Question 4

A graduated cylinder contains 25.0 mL of water. After a metal object is submerged, the water level rises to 32.5 mL. What is the volume of the object?

Accepted Answer

$$7.5 \ \mathrm{mL}$$

Question 5

Which of the following measurements contains three significant figures?

Accepted Answer

0.0300

Question 6

A thermometer reads $$37.0^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$310.2 \ \mathrm{K}$$

Question 7

Which of the following is a derived unit in the SI system?

Accepted Answer

Cubic meter ($$m^3)$$

Question 8

A student records the following measurements: 2.50 m, 2.55 m, 2.53 m, and 2.52 m. If the true value is 2.00 m, which statement best describes the data?

Accepted Answer

The measurements are precise but not accurate.

Question 9

Which metric prefix represents $$10^{-3}$$?

Accepted Answer

milli-

Question 10

A hypothesis must be:

Accepted Answer

Testable and falsifiable

Question 11

Convert $$4.77 \ 	imes \ 10^5$ to standard notation.

Accepted Answer

477,000

Question 12

Which of the following is NOT a base SI unit?

Accepted Answer

Gram (g)

Question 13

A sample has a mass of 250.0 g and a volume of 50.0 mL. What is its density?

Accepted Answer

$$5.00 \ \mathrm{g/mL}$$

Question 14

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between non-zero digits are always significant.

Question 15

When adding $$13.27 + 8.305$$, how many decimal places should the answer have?

Accepted Answer

2 decimal places

Question 16

Which of the following best describes the meniscus when measuring liquid volume?

Accepted Answer

The curve at the surface of a liquid caused by surface tension; measure at the apex of the curve.

Question 17

Which of the following is an example of a measured number?

Accepted Answer

The mass of a coin measured as 2.50 g

Question 18

Which of the following is the correct formula for density?

Accepted Answer

$$\text{density} = \frac{\text{mass}}{\text{volume}}$$

Question 19

A student needs to convert 2.5 kilometers to meters. Which conversion factor should they use?

Accepted Answer

$$1 \ \mathrm{km} = 1000 \ \mathrm{m}$$

Question 20

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

Accepted Answer

Accuracy is how close a measurement is to the true value; precision is how close repeated measurements are to each other.

Fundamentals of Chemistry: Chemistry in Our Lives & Measurements

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