Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

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

Q: Which of the following is an exact value and therefore has an unlimited number of significant figures?

$1\ \mathrm{mole} = 6.02 \times 10^{23}$ units

Question 1

Which of the following statements best describes a quantitative observation in a chemistry experiment?

Accepted Answer

The temperature of the solution increased by $5.0\ ^\circ\mathrm{C}$.

Question 2

A student measures the mass of a sample as $2.50\ \mathrm{g}$ using a balance with a precision of $\pm 0.01\ \mathrm{g}$. Which of the following best represents the measurement and its uncertainty?

Accepted Answer

$2.50\ \mathrm{g} \pm 0.01\ \mathrm{g}$

Question 3

Which of the following is an example of a systematic (determinate) error in a laboratory measurement?

Accepted Answer

A balance that is not zeroed, causing all mass measurements to be 0.2 g too high.

Question 4

Convert a temperature of $25.0\ ^\circ\mathrm{C}$ to Kelvin.

Accepted Answer

$298.2\ \mathrm{K}$

Question 5

Which of the following numbers has exactly three significant figures?

Accepted Answer

0.0300

Question 6

A student multiplies $2.50\ \mathrm{cm}$ by $3.10\ \mathrm{cm}$ and obtains $7.75\ \mathrm{cm}^2$. How should the answer be reported with the correct number of significant figures?

Accepted Answer

$7.8\ \mathrm{cm}^2$

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

A sample of mercury has a density of $13.6\ \mathrm{g/cm}^3$. What is the mass, in grams, of $50.0\ \mathrm{mL}$ of mercury? (Assume $1\ \mathrm{mL} = 1\ \mathrm{cm}^3$)

Accepted Answer

$680\ \mathrm{g}$

Question 9

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

Accepted Answer

Energy of the universe is conserved.

Question 10

A chemical reaction in a beaker causes the temperature of the surroundings to decrease. Which of the following best describes the process?

Accepted Answer

The reaction is endothermic; heat flows from the surroundings to the system.

Question 11

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

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

Question 12

A student needs to convert $2.00\ \mathrm{ft}$ to centimeters. Which of the following conversion factors should be used?

Accepted Answer

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

Question 13

Which of the following is the correct scientific notation for the number 0.00450 with the correct number of significant figures?

Accepted Answer

$4.50 	imes 10^{-3}$

Question 14

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 $\mathrm{mL}$? (Assume $1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$)

Accepted Answer

$0.0292\ \mathrm{mL}$

Question 15

Which of the following is an exact value and therefore has an unlimited number of significant figures?

Accepted Answer

$1\ \mathrm{mole} = 6.02 	imes 10^{23}$ units

Question 16

A student adds $12.34\ \mathrm{g}$, $0.56\ \mathrm{g}$, and $1.2\ \mathrm{g}$ together. What is the sum reported to the correct number of significant figures?

Accepted Answer

$14.1\ \mathrm{g}$

Question 17

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

Accepted Answer

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

Question 18

A $100.0\ \mathrm{g}$ sample of water is heated from $25.0\ ^\circ\mathrm{C}$ to $75.0\ ^\circ\mathrm{C}$. If the specific heat of water is $4.184\ \mathrm{J/g\ ^\circ C}$, how much energy (in joules) is absorbed?

Accepted Answer

$20,900\ \mathrm{J}$

Question 19

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

Accepted Answer

candela (cd)

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

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