Chemistry Review

The table below lists some properties of a sample of lauric acid.

Property Value

Volume 79.6 mL

Mass 70.022 g

Boiling point 222°C

Number of moles 0.350

Which of these is an intensive property of this sample?

• Volume

• Mass

• Boiling point

• Number of moles

Which of the following is considered to be a chemical property of matter?

• Viscosity

• Reactivity

• Texture

• Density

What is an intensive property that can be measured?

• Boiling point

• Mass

• Volume

• Length

What is an extensive property that can be calculated?

• Boiling point

• Volume

• Viscosity

• Specific heat

A lab technician is working on a sample of brass and testing its properties. Which of the following properties of the brass is an extensive property?

• Melting Point: 920°C

• Density: 8.52 g/mL

• Mass: 62.9 g

• Reactivity: Dissolves in strong acid

A student spills a chemical in the laboratory. What should he/she do first?

• Clean it up

• Tell the teacher

• Let it evaporate

• Dilute the spill with water

Which of the following would not be classified as a pure substance?

• Element

• Molecule

• Solution

• Compound

Which statement describes one of the main differences between a physical and a chemical change?

• A chemical change involves reactants and products, whereas a physical change involves only reactants.

• A physical change is a change of state, whereas in a chemical change the substance keeps the same form.

• A physical change brings about a different form of the same substance, whereas a chemical change forms a different substance.

• A chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.