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 SI unit and symbol for measuring mass?

Accepted Answer

Kilogram (kg)

Question 2

A temperature is measured as 100 °C. What is this temperature in Kelvin (K)? Use the equation $K = ^\circ C + 273.15$.

Accepted Answer

$373.15\ \mathrm{K}$

Question 3

Which prefix multiplier corresponds to $10^{-6}$?

Accepted Answer

micro ($\mu$)

Question 4

Convert $5.0\ \mathrm{kg}$ to milligrams (mg) using the appropriate prefix multipliers.

Accepted Answer

$5.0 	imes 10^6\ \mathrm{mg}$

Question 5

A graduated cylinder contains $50.0\ \mathrm{mL}$ of water. After adding a solid, the water level rises to $53.3\ \mathrm{mL}$. If the solid has a mass of $10.0\ \mathrm{g}$, what is its density?

Accepted Answer

$3.03\ \mathrm{g/mL}$

Question 6

Which of the following measurements is both precise and accurate if the true value is $7.42\ \mathrm{g}$?

Accepted Answer

$7.42\ \mathrm{g},\ 7.42\ \mathrm{g},\ 7.42\ \mathrm{g}$

Question 7

How many significant figures are in the measurement $0.00450$?

Accepted Answer

3

Question 8

Calculate the result of $3.905 	imes 2.20$ and round to the correct number of significant figures.

Accepted Answer

$8.59$

Question 9

A sample of acetone has a density of $0.787\ \mathrm{g/mL}$. What is the mass, in grams, of $25.0\ \mathrm{mL}$ of acetone?

Accepted Answer

$19.7\ \mathrm{g}$

Question 10

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 11

Which of the following is the correct formula for density?

Accepted Answer

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

Question 12

If the density of carbon tetrachloride ($\mathrm{CCl}_4$) is $1.59\ \mathrm{g/mL}$, what is the volume of $100.0\ \mathrm{g}$ of $\mathrm{CCl}_4$?

Accepted Answer

$62.9\ \mathrm{mL}$

Question 13

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 14

A student records the following measurements for the mass of a sample: $2.51\ \mathrm{g},\ 2.52\ \mathrm{g},\ 2.53\ \mathrm{g}$. The true value is $2.80\ \mathrm{g}$. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 15

Which of the following numbers has 4 significant figures?

Accepted Answer

0.004560

Question 16

Convert $0.019\ \mathrm{kg}$ to milligrams (mg).

Accepted Answer

$1.9 	imes 10^4\ \mathrm{mg}$

Question 17

Which of the following is the correct conversion for $5.0\ \mathrm{m/s}$ to $\mathrm{km/hr}$?

Accepted Answer

$18\ \mathrm{km/hr}$

Question 18

Which of the following best describes the purpose of using significant figures in calculations?

Accepted Answer

To reflect the precision of the measured values in the final answer.

Question 19

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

Accepted Answer

$8.0\ \mathrm{cm}^3$

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