Q: A student wants to convert 25$$^\circC to $$Fahrenheit. Which formula should they use?

$$^\circ F = (^\circ C \times 1.8) + 32$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning wood in a campfire

Question 2

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

Accepted Answer

Density

Question 3

A student mixes 50 mL of ethanol with 50 mL of water. The resulting solution is best classified as:

Accepted Answer

A homogeneous mixture

Question 4

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

A sample of gold is hammered into a thin sheet. This process is an example of:

Accepted Answer

A physical change

Question 7

Which of the following best represents a reversible change?

Accepted Answer

Melting chocolate and then re-solidifying it

Question 8

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273$$

Question 9

A scientist measures the mass of a sample as 0.00452 kg. Express this value in scientific notation.

Accepted Answer

$$4.52 	imes 10$$^{-3}$$ kg

Question 10

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

Accepted Answer

It reacts explosively with oxygen gas

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

Seawater (unfiltered)

Question 12

Which of the following is NOT an SI base unit?

Accepted Answer

Gram

Question 13

A beaker contains 100 g of water at $$80^\circ C$$ and another contains 100 g of water at $$20^\circ C. If $$the two are mixed, what is the expected final temperature (assuming no heat loss)?

Accepted Answer

$$50^\circ C$$

Question 14

Which of the following is an example of a physical change?

Accepted Answer

Dissolving sugar in water

Question 15

Which of the following is NOT a homogeneous mixture?

Accepted Answer

Trail mix

Question 16

Which of the following is a correct scientific notation for 0.00000321?

Accepted Answer

$$3.21 	imes 10$$^{-6}$$

Question 17

Which of the following is a compound?

Accepted Answer

Ammonia ($$NH_3)$$

Question 18

Which of the following is NOT an example of an intensive property?

Accepted Answer

Milligrams

Question 19

A student wants to convert 25$$^\circC to $$Fahrenheit. Which formula should they use?

Accepted Answer

$$^\circ F = (^\circ C 	imes 1.8) + 32$$

Question 20

Which of the following is a physical property of mercury?

Accepted Answer

It is a silvery liquid at $$25^\circC$$

Fundamental Concepts of Matter and Measurement: Chemistry Foundations for Physical Science

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