Question 1

Which of the following best describes the difference between a physical and a chemical change?

Accepted Answer

A chemical change involves a change in the arrangement of atoms and the making or breaking of chemical bonds, while a physical change does not alter the chemical composition.

Question 2

A scientist observes that a metal cylinder has a mass of $8.3\ \mathrm{g}$, a length of $1.94\ \mathrm{cm}$, and a radius of $0.55\ \mathrm{cm}$. What is the density of the cylinder in $\mathrm{g/cm^3}$? (Use $V = \pi r^2 l$)

Accepted Answer

$4.5\ \mathrm{g/cm^3}$

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Wet sand

Question 4

A temperature is measured as $25.0\ ^\circ\mathrm{C}$. What is this temperature in Kelvin?

Accepted Answer

$298.15\ \mathrm{K}$

Question 5

Which of the following is the correct number of significant figures in the measurement $0.00420$?

Accepted Answer

3

Question 6

A student needs to convert $9255\ \mathrm{cm^3}$ to gallons. Given $1\ \mathrm{gal} = 3.785\ \mathrm{L}$ and $1\ \mathrm{cm^3} = 1\ \mathrm{mL}$, what is the correct answer?

Accepted Answer

$2.45\ \mathrm{gal}$

Question 7

Which SI unit is used to measure the amount of substance?

Accepted Answer

Mole

Question 8

Which prefix represents $10^{-9}$ in the metric system?

Accepted Answer

Nano

Question 9

A vineyard has $145$ acres. A soil supplement requires $5.50\ \mathrm{g}$ for every square meter of vineyard. How many kilograms of soil supplement are needed? ($1\ \mathrm{km^2} = 247\ \mathrm{acres}$)

Accepted Answer

$3.2	imes10^3\ \mathrm{kg}$

Question 10

Which of the following statements about accuracy and precision is correct?

Accepted Answer

Precision refers to how close measurements are to each other, while accuracy refers to how close measurements are to the true value.

Question 11

Which of the following is an exact number?

Accepted Answer

The number of pennies in a pile of 7 pennies

Question 12

Which process is a physical separation technique?

Accepted Answer

Filtration

Question 13

What is the correct answer, with the proper number of significant figures, for $\frac{131 - 86.7}{53.09}$?

Accepted Answer

0.83

Question 14

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 15

A cube has sides of $10\ \mathrm{mm}$. What is its volume in $\mathrm{mm^3}$?

Accepted Answer

$1000\ \mathrm{mm^3}$

Question 16

Which of the following best describes the scientific approach?

Accepted Answer

It involves making observations, forming hypotheses, testing with experiments, and revising theories or laws as needed.

Question 17

Which of the following is the correct conversion for $1\ \mathrm{cm^3}$?

Accepted Answer

$1\ \mathrm{mL}$

Question 18

Which of the following is the best example of a homogeneous mixture?

Accepted Answer

Tea with dissolved sugar

Question 19

Which of the following is the correct formula for density?

Accepted Answer

$d = \frac{m}{V}$

Question 20

Which of the following is the correct order-of-magnitude estimate for $1.67492728 	imes 10^{-27}\ \mathrm{kg} / 9.10938262 	imes 10^{-31}\ \mathrm{kg}$?

Accepted Answer

$10^3$

Units, Significant Figures, and Problem Solving in General Chemistry

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