Q: Convert 5.6 km to meters using the correct metric prefix.

$$5.6 \times 10^3$\ \mathrm{m}$$

Q: A room has a volume of $$1.5 \times 10^9$\ \mathrm{cm^3$}. $$What is the volume in $$\mathrm{m^3$}$$?

$$1.5 \times 10^3$\ \mathrm{m^3$}$$

Q: If the density of an unknown metal is $$2.14\ \mathrm{g/cm^3$}$$, what is its density in $$\mathrm{kg/m^3$}$$?

$$2.14 \times 10^3$\ \mathrm{kg/m^3$}$$

Question 1

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

Accepted Answer

Air

Question 2

Which of the following represents a chemical change?

Accepted Answer

Burning wood

Question 3

A student measures the mass of a metal cube as 54.0 g and its volume as 6.0 cm$$^3. $$What is the density of the metal?

Accepted Answer

$$9.0\ \mathrm{g/cm^3$}$$

Question 4

Which of the following is NOT a chemical property?

Accepted Answer

Is a yellow solid at room temperature

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

Convert 5.6 km to meters using the correct metric prefix.

Accepted Answer

$$5.6 	imes 10^3$\ \mathrm{m}$$

Question 7

Which of the following scientific notation values is written correctly?

Accepted Answer

$$1.25 	imes 10^2$

Question 8

A sample of copper with a density of $$8.96\ \mathrm{g/cm^3$}$$ has a diameter of $$0.32\ \mathrm{cm}. If $$the mass of the sample is $$21.7\ \mathrm{g}$$, what is its length? (Assume the sample is a cylinder. Use $$V = \pi r^2$ h.)$$

Accepted Answer

$$3.1\ \mathrm{cm}$$

Question 9

Which of the following is an example of an intensive property?

Accepted Answer

Melting point

Question 10

A room has a volume of $$1.5 	imes 10^9$\ \mathrm{cm^3$}. $$What is the volume in $$\mathrm{m^3$}$$?

Accepted Answer

$$1.5 	imes 10^3$\ \mathrm{m^3$}$$

Question 11

Which of the following best describes a physical change?

Accepted Answer

Dissolving sugar in water

Question 12

If the density of an unknown metal is $$2.14\ \mathrm{g/cm^3$}$$, what is its density in $$\mathrm{kg/m^3$}$$?

Accepted Answer

$$2.14 	imes 10^3$\ \mathrm{kg/m^3$}$$

Question 13

Which of the following is a reversible physical change?

Accepted Answer

Melting ice

Question 14

A scientist places a piece of unknown solid weighing $$0.45\ \mathrm{g} in a $$graduated cylinder. The water level increases from $$200\ \mathrm{mL} to$$ $$201\ \mathrm{mL}. $$What is the density of the solid?

Accepted Answer

$$0.45\ \mathrm{g/mL}$$

Question 15

Which of the following is the correct number of significant figures for the measurement $$0.003640$$?

Accepted Answer

4

Question 16

Which of the following is NOT a physical property?

Accepted Answer

Potassium metal is extremely reactive with water

Question 17

A pharmaceutical drug contains $$4.0\%$$ active ingredient by mass. What mass of active ingredient is present in a bottle containing $$120\ \mathrm{g} of $$the drug?

Accepted Answer

$$4.8\ \mathrm{g}$$

Question 18

Which of the following is classified as a pure substance?

Accepted Answer

Gold bar

Question 19

Which SI base unit is used to measure electric current?

Accepted Answer

Ampere

Question 20

A cube of silver has a density of $$10.5\ \mathrm{g/cm^3$}$$ and measures $$0.36\ \mathrm{cm} on $$each side. What is its mass in kilograms?

Accepted Answer

$$0.0049\ \mathrm{kg}$$

Ron ( test )

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