Q: Which of the following is the correct conversion factor to use when converting from centimeters to meters?

$$1 \ \text{cm} = 0.01 \ \text{m}$$

Q: Which of the following is the correct conversion from $$25 \ \text{mm} to $$meters?

$$2.5 \times 10$$^{-3}$$ \ \text{m}$$

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

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 1

Which of the following is the correct conversion factor to use when converting from centimeters to meters?

Accepted Answer

$$1 \ 	ext{cm} = 0.01 \ 	ext{m}$$

Question 2

A student measures the mass of a sample as $$5.62 \ 	ext{g}$$ and its volume as $$2.0 \ 	ext{mL}. $$What is the density of the sample?

Accepted Answer

$$2.8 \ 	ext{g/mL}$$

Question 3

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

Accepted Answer

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

Question 4

A patient receives a prescription for $$250 \ 	ext{mg} of a $$medication. If the pharmacy only has $$0.5 \ 	ext{g}$$ tablets, how many tablets should the patient take?

Accepted Answer

0.5 tablets

Question 5

Which of the following is the correct scientific notation for $$0.000345$$?

Accepted Answer

$$3.45 	imes 10$$^{-4}$$

Question 6

A cube has a side length of $$2.0 \ 	ext{cm}. $$What is its volume in $$	ext{cm}^3$$?

Accepted Answer

$$8.0 \ 	ext{cm}^3$$

Question 7

If a solution has a density of $$1.25 \ 	ext{g/mL}$$ and a mass of $$250 \ 	ext{g}$$, what is its volume?

Accepted Answer

$$200 \ 	ext{mL}$$

Question 8

Which of the following is the correct conversion from $$25 \ 	ext{mm} to $$meters?

Accepted Answer

$$2.5 	imes 10$$^{-3}$$ \ 	ext{m}$$

Question 9

A sample of gold has a mass of $$19.3 \ 	ext{g}$$ and a volume of $$1.0 \ 	ext{cm}^3. $$What is the density of gold?

Accepted Answer

$$19.3 \ 	ext{g/cm}^3$$

Question 10

A car travels $$120 \ 	ext{km} in$$ $$2.0 \ 	ext{hours}. $$What is its average speed in $$	ext{m/s}$$?

Accepted Answer

$$16.7 \ 	ext{m/s}$$

Question 11

Which of the following is the correct way to express $$5,600,000 in $$scientific notation?

Accepted Answer

$$5.6 	imes 10$$^{6}$$

Question 12

A student needs $$250 \ 	ext{mL} of a$$ $$0.5 \ 	ext{M}$$ NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.125 \ 	ext{mol}$$

Question 13

Which of the following is the correct conversion for $$1.5 \ 	ext{kg} to $$grams?

Accepted Answer

$$1,500 \ 	ext{g}$$

Question 14

A graduated cylinder contains $$35.0 \ 	ext{mL} of $$water. After a metal object is submerged, the water level rises to $$42.5 \ 	ext{mL}. $$What is the volume of the object?

Accepted Answer

$$7.5 \ 	ext{mL}$$

Question 15

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 16

A solution is prepared by dissolving $$5.0 \ 	ext{g} of $$NaCl in enough water to make $$250 \ 	ext{mL} of $$solution. What is the concentration in $$	ext{g/L}$$?

Accepted Answer

$$20 \ 	ext{g/L}$$

General Chemistry Homework Guidance: Unit Conversions, Density, and Significant Figures

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