Q: Which equation correctly converts Celsius to Kelvin?

$$K = \text{degree Celsius} + 273.15$$

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

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

Q: A student needs to convert 25.0 cm to inches using the conversion factor $$1 \text{ inch} = 2.54 \text{ cm}. $$What is the correct setup for dimensional analysis?

$$25.0 \text{ cm} \times \frac{1 \text{ inch}}{2.54 \text{ cm}}$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of atoms from two or more different elements, with a definite composition.

Question 2

Which property is classified as intensive?

Accepted Answer

Density

Question 3

A student measures the mass of a sample as 12.345 g. Which digit is considered uncertain?

Accepted Answer

5

Question 4

Which separation technique would be most appropriate for separating sand from water?

Accepted Answer

Filtration

Question 5

Which equation correctly converts Celsius to Kelvin?

Accepted Answer

$$K = 	ext{degree Celsius} + 273.15$$

Question 6

Which of the following is a chemical change?

Accepted Answer

Burning gasoline

Question 7

A homogeneous mixture is also known as:

Accepted Answer

A solution

Question 8

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 9

Which SI unit is used for measuring energy?

Accepted Answer

Joule (J)

Question 10

A sample contains 3.5 g of salt dissolved in 100 mL of water. What type of matter is this?

Accepted Answer

Homogeneous mixture

Question 11

Which of the following statements about significant figures is correct?

Accepted Answer

Zeroes at the end of a number are significant if the number contains a decimal point.

Question 12

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

Accepted Answer

Mass

Question 13

Which of the following is the correct formula for density?

Accepted Answer

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

Question 14

A student needs to convert 25.0 cm to inches using the conversion factor $$1 	ext{ inch} = 2.54 	ext{ cm}. $$What is the correct setup for dimensional analysis?

Accepted Answer

$$25.0 	ext{ cm} 	imes \frac{1 	ext{ inch}}{2.54 	ext{ cm}}$$

Question 15

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

Accepted Answer

Salad

Question 16

Which of the following best describes kinetic energy?

Accepted Answer

Energy of motion, dependent on mass and velocity

Question 17

Which of the following is an exact number?

Accepted Answer

The number of atoms in a mole

Question 18

A chemist wants to separate a mixture of dyes in ink. Which method should they use?

Accepted Answer

Chromatography

Question 19

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Liter (L)

Question 20

A student mixes two colorless solutions and observes a color change. This is evidence of:

Accepted Answer

A chemical change

Introduction to Chemistry: Matter, Energy, and Measurement

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