Q: Convert $$1.15 \times 10^8$\ \mathrm{cm^3$} to$$ $$\mathrm{km^3$}.$$

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

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 a compound?

Accepted Answer

A substance composed of two or more different elements that are chemically bonded together.

Question 2

Which of the following is a chemical change?

Accepted Answer

Burning wood in a campfire.

Question 3

A student measures the mass of a sample as 0.003840 g. How many significant figures does this measurement have?

Accepted Answer

4

Question 4

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

Accepted Answer

Density

Question 5

Which of the following is NOT a physical property?

Accepted Answer

Rusting in air

Question 6

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

Accepted Answer

About $$340\ \mathrm{cm}$$

Question 7

Which of the following is the correct formula for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 8

A pharmaceutical pill weighs $$2.5\ \mathrm{g}$$ and contains $$4.0\%$$ active ingredient by mass. What is the mass in mg of active ingredient in a bottle of 120 pills?

Accepted Answer

$$4,800\ \mathrm{mg}$$

Question 9

Which of the following is a correct statement about significant figures in calculations?

Accepted Answer

In multiplication and division, the answer should have as many significant figures as the number with the least significant figures.

Question 10

Which of the following is a homogeneous mixture?

Accepted Answer

A cup of black coffee

Question 11

A piece of unknown solid weighs $$0.045\ \mathrm{lbs}. $$When placed in a beaker, the water level rises from $$200\ \mathrm{mL} to$$ $$260\ \mathrm{mL}. $$What is the density of the solid in $$\mathrm{g/mL}$$? (1 lb = 453.6 g)

Accepted Answer

$$0.78\ \mathrm{g/mL}$$

Question 12

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

Accepted Answer

It reacts explosively with oxygen gas.

Question 13

Which of the following is NOT an extensive property?

Accepted Answer

Malleability

Question 14

Convert $$1.15 	imes 10^8$\ \mathrm{cm^3$} to$$ $$\mathrm{km^3$}.$$

Accepted Answer

$$1.15 	imes 10$$^{-10}$$\ \mathrm{km^3$}$$

Question 15

Which of the following is the correct scientific notation for 0.000101?

Accepted Answer

$$1.01 	imes 10$$^{-4}$$

Question 16

Which of the following is a reversible change?

Accepted Answer

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

Question 17

Which of the following is the correct formula for density?

Accepted Answer

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

Question 18

Which of the following is the SI base unit for temperature?

Accepted Answer

Kelvin (K)

Question 19

Which of the following is the correct way to express 7.3 x $$10^6 g $$without exponents using metric prefixes?

Accepted Answer

7.3 megagrams

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