Q: Which of the following is a correct conversion factor for changing centimeters to meters?

$$1 \text{ m} = 100 \text{ cm}$$

Question 1

Which of the following correctly expresses 0.000456 in scientific notation?

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 2

A nurse needs to administer 0.75 L of saline solution to a patient. How many milliliters (mL) is this?

Accepted Answer

$$750$$ 	ext{ mL}$

Question 3

Which of the following is NOT an SI base unit?

Accepted Answer

Gram (g)

Question 4

How many significant figures are in the measurement 0.04050 g?

Accepted Answer

4

Question 5

A student measures the mass of a sample as 12.30 g and its volume as 4.1 mL. What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.0$$ 	ext{ g/mL}$

Question 6

Which prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 7

Convert 5.0 km to meters using the correct conversion factor.

Accepted Answer

$$5,000 	ext{ m}$$

Question 8

A medication is prescribed at a dose of 250 mg. How many grams is this?

Accepted Answer

$$0.25$$ 	ext{ g}$

Question 9

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 10

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically combined in a fixed ratio

Question 11

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Question 12

A food contains 200 Calories (Cal). How many kilojoules (kJ) is this? (1 Cal = 4.184 kJ)

Accepted Answer

$$836.8$$ 	ext{ kJ}$

Question 13

Which statement about specific heat is correct?

Accepted Answer

Specific heat is the amount of heat required to raise the temperature of 1 g of a substance by 1 $$^\circC.$$

Question 14

A sample of water (specific heat $$= 4.184 J/g$^\circC) $$absorbs 418.4 J of heat. If the mass of water is 10.0 g, what is the temperature change ($$\Delta T$$)?

Accepted Answer

$$10.0^\circC$

Question 15

Which process describes the change from a solid directly to a gas?

Accepted Answer

Sublimation

Question 16

A heating curve for water shows a plateau at 100$$^\circC. $$What is happening at this point?

Accepted Answer

Water is boiling

Question 17

Which of the following is a correct conversion factor for changing centimeters to meters?

Accepted Answer

$$1 	ext{ m} = 100 	ext{ cm}$$

Question 18

A sample of metal has a mass of 45.0 g and a volume of 15.0 mL. What is its density?

Accepted Answer

$$3.0$$ 	ext{ g/mL}$

Question 19

Which of the following is a pure substance?

Accepted Answer

Oxygen gas

Question 20

Which of the following best describes kinetic energy?

Accepted Answer

Energy due to motion

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