Q: Which of the following is the correct formula for calculating the density of a substance?

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following best explains why graphite and diamond, both made of carbon atoms, have such different physical properties?

Accepted Answer

Their atoms are arranged in different geometric structures.

Question 2

A student observes that the mass of a closed container does not change during a chemical reaction. Which scientific concept does this observation best support?

Accepted Answer

Law of conservation of mass

Question 3

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 4

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

Accepted Answer

Filtration

Question 5

A sample of copper is heated from room temperature to $$95\ ^\circ\mathrm{C}. $$What happens to its density?

Accepted Answer

The sample expands.

Question 6

Which of the following statements best distinguishes a scientific law from a scientific theory?

Accepted Answer

A law summarizes a series of related observations; a theory gives the underlying reasons for them.

Question 7

Which of the following is a homogeneous mixture?

Accepted Answer

Sweetened tea

Question 8

Which temperature scale has no negative values?

Accepted Answer

Kelvin

Question 9

A student measures the mass of a coin as 5.01 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 10

Which of the following is the correct formula for calculating the density of a substance?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 11

A student adds 12.345 g and 1.2 g. What is the correct answer, using the rules for significant figures?

Accepted Answer

$$13.5\ \mathrm{g}$$

Question 12

Which of the following best describes a physical change?

Accepted Answer

Water boiling to form steam

Question 13

A block of aluminum has a mass of 54.0 g and a volume of 20.0 mL. What is its density?

Accepted Answer

$$2.7\ \mathrm{g/mL}$$

Question 14

Which of the following is an example of potential energy being converted to kinetic energy?

Accepted Answer

A car engine running and moving the car forward

Question 15

Which of the following is a compound?

Accepted Answer

Water

Question 16

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring experimental results

Question 17

A student multiplies $$2.0035 by$$ $$3.20. $$What is the answer rounded to the correct number of significant figures?

Accepted Answer

$$6.4$$

Question 18

Which of the following best describes a heterogeneous mixture?

Accepted Answer

Wet sand

Question 19

Which of the following is a correct statement about energy changes in chemical reactions?

Accepted Answer

Energy is conserved; it is neither created nor destroyed.

Question 20

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

Accepted Answer

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

Chapter 1: Matter, Measurement, and Problem Solving – General Chemistry Study Notes

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