Q: A sample of mercury has a density of $$13.6\ \mathrm{g/cm^3$}. $$What is the mass, in grams, of $$95.0\ \mathrm{mL} of $$mercury? (Assume $$1\ \mathrm{mL} = 1\ \mathrm{cm^3$})$$

$$1.29 \times 10^3$\ \mathrm{g}$$

Q: Which of the following is the correct equation to convert Celsius to Fahrenheit?

$$^\circ\mathrm{F} = 1.8\times(^\circ\mathrm{C}) + 32$$

Q: A field of $$145\ \mathrm{acres}$$ requires $$5.50\ \mathrm{g/m^2$} of a $$soil supplement. How many grams of supplement are required? ($$1\ \mathrm{km^2$} = 247\ \mathrm{acres}$$, $$1\ \mathrm{km^2$} = 10^6$\ \mathrm{m^2$})$$

$$3.23 \times 10^6$\ \mathrm{g}$$

Q: A student needs to convert $$2.00\ \mathrm{ft} to $$centimeters. Which of the following is the correct setup using dimensional analysis?

$$2.00\ \mathrm{ft} \times \frac{12\ \mathrm{in}}{1\ \mathrm{ft}} \times \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}}$$

Question 1

A student measures the mass of a sample three times and obtains values of 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.00 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 2

Which of the following is an example of a qualitative observation?

Accepted Answer

The solution turned blue after adding the reagent.

Question 3

Convert a body temperature of $$37.0\ ^\circ\mathrm{C} to $$kelvin.

Accepted Answer

$$310.2\ \mathrm{K}$$

Question 4

Which of the following numbers has three significant figures?

Accepted Answer

0.0600

Question 5

A student records a measurement as $$23.45 \pm 0.05\ \mathrm{mL}. $$What is the range in which the true value lies?

Accepted Answer

$$23.40\ \mathrm{mL} to$$ $$23.50\ \mathrm{mL}$$

Question 6

Which of the following is an exact number?

Accepted Answer

1 dozen = 12 items

Question 7

A sample of mercury has a density of $$13.6\ \mathrm{g/cm^3$}. $$What is the mass, in grams, of $$95.0\ \mathrm{mL} of $$mercury? (Assume $$1\ \mathrm{mL} = 1\ \mathrm{cm^3$})$$

Accepted Answer

$$1.29 	imes 10^3$\ \mathrm{g}$$

Question 8

Which of the following is the correct equation to convert Celsius to Fahrenheit?

Accepted Answer

$$^\circ\mathrm{F} = 1.8	imes(^\circ\mathrm{C}) + 32$$

Question 9

A student multiplies $$6.0\ \mathrm{cm} by$$ $$4.0\ \mathrm{cm}$$ and gets $$24.0\ \mathrm{cm^2$}. $$How should the answer be reported with the correct number of significant figures?

Accepted Answer

$$24\ \mathrm{cm^2$}$$

Question 10

Which of the following best describes an intensive property?

Accepted Answer

A property that does not depend on the amount of substance present.

Question 11

A sample of gasoline has a mass of $$22\ \mathrm{mg}$$ and a density of $$0.754\ \mathrm{g/cm^3$}. $$What is its volume in $$\mathrm{mL}$$?

Accepted Answer

$$0.029\ \mathrm{mL}$$

Question 12

Which of the following is the correct SI base unit for luminous intensity?

Accepted Answer

candela (cd)

Question 13

A chemical reaction absorbs heat from the surroundings and the temperature of the surroundings decreases. This process is:

Accepted Answer

Endothermic

Question 14

Which of the following conversion factors is considered to have an unlimited number of significant figures?

Accepted Answer

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

Question 15

A student adds $$23.46\ \mathrm{cm}$$ and $$7.1\ \mathrm{cm}. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$30.6\ \mathrm{cm}$$

Question 16

Which of the following best describes the First Law of Thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only converted from one form to another.

Question 17

A field of $$145\ \mathrm{acres}$$ requires $$5.50\ \mathrm{g/m^2$} of a $$soil supplement. How many grams of supplement are required? ($$1\ \mathrm{km^2$} = 247\ \mathrm{acres}$$, $$1\ \mathrm{km^2$} = 10^6$\ \mathrm{m^2$})$$

Accepted Answer

$$3.23 	imes 10^6$\ \mathrm{g}$$

Question 18

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 19

A student needs to convert $$2.00\ \mathrm{ft} to $$centimeters. Which of the following is the correct setup using dimensional analysis?

Accepted Answer

$$2.00\ \mathrm{ft} 	imes \frac{12\ \mathrm{in}}{1\ \mathrm{ft}} 	imes \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}}$$

Essentials of Units, Measurement, and Problem Solving in General Chemistry

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