Q: If a room has a volume of $$1.15 \times 10^8$ cm^3$, what is the volume in km^3$? (Use 1$$ \text{ km}^3 = $$10^{15}$$ \text{ cm}^3$$)

$$1.15 \times 10$$^{-9}$$ km^3$

Q: Which of the following is the correct formula for density?

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

Question 1

Which of the following best describes an element?

Accepted Answer

A substance composed of only one kind of atom.

Question 2

Which of the following is a chemical change?

Accepted Answer

Burning wood in a fireplace.

Question 3

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

Accepted Answer

A cup of black coffee.

Question 4

Which property is classified as an intensive property?

Accepted Answer

Density

Question 5

Which of the following is NOT a physical property?

Accepted Answer

An iron bar rusts.

Question 6

Which of the following is a chemical property of hydrogen gas?

Accepted Answer

It reacts explosively with oxygen gas.

Question 7

Which of the following is an extensive property?

Accepted Answer

Moles

Question 8

What is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = 	ext{ºC} + 273$$

Question 9

Which scientific notation value is written correctly?

Accepted Answer

$$5.220 x 10^3$$

Question 10

Which SI base unit is used to measure mass?

Accepted Answer

Kilogram (kg)

Question 11

A copper wire (density = 8.96 $$g/cm^3) $$has a diameter of 0.32 mm. If a sample of this copper wire has a mass of 21.7 g, how long is the wire? (Assume the wire is a cylinder. Use $$V = \pi r^2$ h$$ and $$d = \frac{m}{V})$$

Accepted Answer

Approximately 3000 cm

Question 12

Which of the following represents a reversible change?

Accepted Answer

Melting a chocolate bar then re-solidifying it in the freezer.

Question 13

If a room has a volume of $$1.15 	imes 10^8$ cm^3$, what is the volume in km^3$? (Use 1$$ 	ext{ km}^3 = $$10^{15}$$ 	ext{ cm}^3$$)

Accepted Answer

$$1.15 	imes 10$$^{-9}$$ km^3$

Question 14

Which of the following is the correct formula for density?

Accepted Answer

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

Question 15

A piece of unknown solid weighs approximately 0.045 lbs. When a scientist places it in a glass beaker the water level increases from 200 mL to 260 mL. What is the density of the unknown solid in g/mL? (1 lb = 453.6 g)

Accepted Answer

0.87 g/mL

Question 16

Which of the following statements about significant figures is correct?

Accepted Answer

Leading zeros are not significant.

Question 17

Perform the following calculation to the correct number of significant figures: $$(3.16) 	imes (0.003027) 	imes (5.7 	imes 10$$^{-3}$$)$$

Accepted Answer

$$5.5 	imes 10$$^{-6}$$

Question 18

Which of the following is NOT a conversion factor?

Accepted Answer

1 mL = 1 cm

Question 19

Which of the following is a physical change?

Accepted Answer

Condensing water vapor.

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