Q: A student needs to convert 5.00 feet to inches. Which dimensional analysis setup is correct?

$$5.00\ ft \times \frac{12\ in}{1\ ft}$$

Question 1

Which statement best describes the First Law of Thermodynamics as it applies to chemical reactions?

Accepted Answer

Energy of the universe is conserved; energy lost by the system is gained by the surroundings.

Question 2

During the melting of ice, which of the following best describes the direction of heat flow and the sign of heat?

Accepted Answer

Heat flows from the surroundings to the ice; heat is positive.

Question 3

A student burns natural gas in a laboratory experiment. Is this process exothermic or endothermic, and what is the sign of the energy change for the system?

Accepted Answer

Exothermic; negative

Question 4

Which of the following is a correct conversion factor for converting inches to centimeters?

Accepted Answer

$$\frac{1\ in}{2.54\ cm}$$

Question 5

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition varies from one region to another.

Question 6

Which statement correctly distinguishes between a scientific law and a scientific theory?

Accepted Answer

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

Question 7

Which of the following is an example of a compound?

Accepted Answer

Water ($$H_2O)$$

Question 8

A sample of sweetened tea is best classified as which type of matter?

Accepted Answer

Homogeneous mixture

Question 9

Which of the following is NOT a characteristic of the scientific method?

Accepted Answer

Acceptance of explanations without evidence

Question 10

Which statement about elements is correct?

Accepted Answer

Elements are composed of a single type of atom.

Question 11

A student needs to convert 5.00 feet to inches. Which dimensional analysis setup is correct?

Accepted Answer

$$5.00\ ft 	imes \frac{12\ in}{1\ ft}$$

Question 12

Which of the following is a correct statement about gases?

Accepted Answer

Gases are compressible and their particles are far apart.

Question 13

Which of the following is a falsifiable hypothesis?

Accepted Answer

If a substance burns, it combines with a component of air.

Question 14

Which law states that in a chemical reaction, matter is neither created nor destroyed?

Accepted Answer

Law of conservation of mass

Question 15

Which of the following is an example of quantifiable scientific data?

Accepted Answer

The mass of the sample is $$12.5\ g.$$

Question 16

Which of the following statements about solids is correct?

Accepted Answer

Solids have a fixed volume and rigid shape.

Question 17

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

Accepted Answer

Air

Question 18

Which of the following best describes the composition of a compound?

Accepted Answer

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

Question 19

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

Accepted Answer

Ignoring experimental results

Question 20

Which of the following statements about the classification of matter is correct?

Accepted Answer

A pure substance can be either an element or a compound.

CHEM 1201: Basic Chemistry – Structure, Properties, and Measurement

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