$$5.0 \text{ in} \times \frac{2.54 \text{ cm}}{1 \text{ in}}$$

Question 1

Which statement best explains why graphite and diamond, both made of carbon, have such different properties?

Accepted Answer

The carbon atoms in graphite and diamond are arranged in different geometrical structures.

Question 2

Which of the following is the most important idea in scientific chemistry, according to the study materials?

Accepted Answer

The properties of matter are determined by the properties of molecules and atoms.

Question 3

A water molecule is composed of:

Accepted Answer

Two hydrogen atoms and one oxygen atom.

Question 4

Which of the following best describes a scientific theory?

Accepted Answer

A model for the way nature is and tries to explain why nature behaves as it does.

Question 5

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam.

Question 6

Which separation technique would be most appropriate for separating a mixture of sand and water?

Accepted Answer

Filtration

Question 7

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

Accepted Answer

Sweetened tea

Question 8

Which statement about elements and compounds is correct?

Accepted Answer

A compound is composed of two or more elements in fixed, definite proportions.

Question 9

Which of the following is an intensive property?

Accepted Answer

Density

Question 10

A sample of copper is heated from room temperature to 95°C. What happens to its density?

Accepted Answer

The sample expands.

Question 11

Which temperature scale has no negative temperatures?

Accepted Answer

Kelvin

Question 12

What type of energy is chemical energy?

Accepted Answer

Potential energy

Question 13

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

Accepted Answer

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

Question 14

A measurement is recorded as 0.0520 g. How many significant figures does this value have?

Accepted Answer

3

Question 15

Which rule should be followed when rounding numbers in multistep calculations?

Accepted Answer

Round only the final answer to the correct number of significant figures.

Question 16

Which of the following is a derived unit in the SI system?

Accepted Answer

Liter

Question 17

A student measures the mass of a lead block several times and gets values close to each other but far from the true value. The measurements are:

Accepted Answer

Precise but not accurate.

Question 18

Which of the following is the correct dimensional analysis setup to convert 5.0 inches to centimeters, given $$1 	ext{ in} = 2.54 	ext{ cm}$$?

Accepted Answer

$$5.0 	ext{ in} 	imes \frac{2.54 	ext{ cm}}{1 	ext{ in}}$$

Question 19

Which prefix multiplier is most appropriate for reporting a measurement of $$5.57 	imes 10^6$ meters?

Accepted Answer

Mega

Question 20

Which of the following statements about the law of conservation of mass is correct?

Accepted Answer

In a chemical reaction, matter is neither created nor destroyed.

Matter, Measurement, and Problem Solving: Foundations of Chemistry

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