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 the difference between a law and a theory in the scientific method?

Accepted Answer

A law predicts future observations and summarizes past ones, while a theory provides a general explanation for the characteristics and behavior of nature.

Question 2

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

Accepted Answer

Melting of ice to form liquid water.

Question 3

A sample of matter is composed of two types of atoms chemically bonded together in a fixed ratio. Which classification best describes this sample?

Accepted Answer

Compound

Question 4

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 5

Which of the following is an intensive property?

Accepted Answer

Density

Question 6

A scientist observes that the total mass of substances before and after a chemical reaction remains unchanged. This observation is best explained by which law?

Accepted Answer

Law of conservation of mass

Question 7

Convert a temperature of $$36.6\ ^\circ\mathrm{C} ($$typical human body temperature) to Kelvin.

Accepted Answer

$$309.75\ \mathrm{K}$$

Question 8

Which of the following numbers has four significant figures?

Accepted Answer

0.04550

Question 9

A student measures the mass of a sample three times and gets values that are very close to each other, but far from the actual value. This set of measurements is:

Accepted Answer

Precise but not accurate

Question 10

Which of the following best describes the arrangement of atoms in a crystalline solid?

Accepted Answer

Atoms are in patterns with long-range, repeating order.

Question 11

A mixture of ethanol and water is heated. Ethanol boils at $$78.4\ ^\circ\mathrm{C}$$ and water at $$100\ ^\circ\mathrm{C}. $$Which separation technique would best separate ethanol from water?

Accepted Answer

Distillation

Question 12

Which of the following is a chemical property of gasoline?

Accepted Answer

It is flammable.

Question 13

A sample of gold is hammered into a thin sheet. This demonstrates which property?

Accepted Answer

Physical property

Question 14

Which of the following is the correct scientific notation for the number 0.0000560 with three significant figures?

Accepted Answer

$$5.60 	imes 10$$^{-5}$$

Question 15

A room has an area of $$90.0\ \mathrm{ft}^2. $$What is the equivalent area in square inches? (1 ft = 12 in)

Accepted Answer

$$12,960\ \mathrm{in}^2$$

Question 16

Which of the following best describes the difference between kinetic and potential energy?

Accepted Answer

Kinetic energy is associated with motion, while potential energy is associated with position or composition.

Question 17

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

Accepted Answer

Salt water

Question 18

A student needs to convert $$3.50\ \mathrm{yd} to $$inches. What is the correct answer? (1 yd = 36 in)

Accepted Answer

$$126\ \mathrm{in}$$

Question 19

Which of the following statements about atoms and molecules is correct?

Accepted Answer

Molecules are formed when atoms bind together in specific geometrical arrangements.

Question 20

Which of the following is the correct formula for density?

Accepted Answer

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

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