Q: Which of the following is the correct formula to calculate the density of a substance?

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

Q: Which equation would you use to convert a temperature from Celsius to Kelvin?

$$\text{Temp (K)} = \text{Temp (°C)} + 273$$

Q: Which of the following is the correct formula for percent yield?

$$\%\text{Yield} = \dfrac{\text{Actual Yield}}{\text{Theoretical Yield}} \times 100$$

Q: Which of the following is the correct conversion factor for inches to centimeters?

$$1\ \text{in} = 2.54\ \text{cm}$$

Q: Which of the following is the correct formula for mass fraction?

$$\text{Mass Fraction} = \dfrac{\text{Mass of element}}{\text{Mass of compound}}$$

Question 1

Which of the following is the correct formula to calculate the density of a substance?

Accepted Answer

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

Question 2

A student measures the mass of a cube to be 5.3875 g and its volume to be 3.10 cm$$^3. $$What is the density of the cube?

Accepted Answer

$$1.7379\ 	ext{g/cm}^3$$

Question 3

Which of the following is NOT an element?

Accepted Answer

Bronze

Question 4

The boiling of water is an example of which type of change?

Accepted Answer

Physical change

Question 5

Convert $$0.5747\ 	ext{cm}^2 to$$ $$	ext{mm}^2.$$

Accepted Answer

$$57.47\ 	ext{mm}^2$$

Question 6

Which equation would you use to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$	ext{Temp (K)} = 	ext{Temp (°C)} + 273$$

Question 7

A compound contains 12 g of carbon and 32 g of oxygen. What is the mass percent of carbon in the compound?

Accepted Answer

$$27.3\%$$

Question 8

Which of the following is a quantitative observation?

Accepted Answer

The volume of solution B is greater than solution A.

Question 9

A student records the length of a pencil as 5.6 cm using a ruler marked every 0.1 cm. How many significant figures should be reported?

Accepted Answer

3

Question 10

Which of the following best describes the change depicted when ice melts into water?

Accepted Answer

Physical change

Question 11

You have a solution containing 5 g of NaCl dissolved in 100 g of water. What is the mass fraction of NaCl in the solution?

Accepted Answer

$$0.0476$$

Question 12

Which of the following is the correct formula for percent yield?

Accepted Answer

$$\%	ext{Yield} = \dfrac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100$$

Question 13

A graduated cylinder contains 10.0 mL of water. You add a metal object and the water rises to 13.5 mL. What is the volume of the metal object?

Accepted Answer

$$3.5\ 	ext{mL}$$

Question 14

Which of the following is the correct conversion factor for inches to centimeters?

Accepted Answer

$$1\ 	ext{in} = 2.54\ 	ext{cm}$$

Question 15

A student needs to convert 1.00 L to mL. What is the correct answer?

Accepted Answer

$$1000\ 	ext{mL}$$

Question 16

Which of the following is the correct formula for the volume of a cylinder?

Accepted Answer

$$V = \pi r^2$ h$$

Question 17

A reaction has a theoretical yield of 10.0 g and an actual yield of 8.5 g. What is the percent yield?

Accepted Answer

$$85\%$$

Question 18

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 19

Which of the following is the correct formula for mass fraction?

Accepted Answer

$$	ext{Mass Fraction} = \dfrac{	ext{Mass of element}}{	ext{Mass of compound}}$$

Introduction to Chemistry: Key Concepts, Formulas, and Practice Questions

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