Matter can be modelled

Multiple Choice

From last lesson: What is the difference between a compound and a mixture?

• Compounds are made of atoms of only one element, mixtures are not

• Compounds are chemically bonded; mixtures are physically combined

• Mixtures are only solids; compounds are only gases

• Compounds have the same atoms as mixtures

Multiple Choice

From last lesson: Which of the following is an example of a molecular compound?

• Oxygen (O₂)

• Carbon dioxide (CO₂)

• Gold (Au)

• Helium (He)

Multiple Choice

From last lesson: What are polymers?

• Elements that can’t be broken down

• Gases that float in air

• Chains of repeating molecules

• Mixtures of metals and gases

Multiple Choice

Which of the following is not one of the learning intentions?

• Describe how elements, compounds, and mixtures are modelled

• Explain how energy is released in chemical reactions

• Model the difference between suspensions and colloids
  

• Understand chemical representations

Match

Match Each Element with its correct symbol

• Au

• O

• He

• Ag

• C

Gold

Oxygen

Helium

Silver

Carbon

• Gold

• Oxygen

• Helium

• Silver

• Carbon

Multiple Choice

What does the “2” in H₂O tell us?

• There are 2 oxygen atoms

• There are 2 water molecules

• There are 2 hydrogen atoms

• The molecule has a double bond

Multiple Choice

What is the chemical formula for methane?

• CO₂

• H₂O

• H₂

• CH₄

Multiple Choice

Why are percentages used to describe mixtures?

• To measure temperature

• To identify atomic numbers

• To show how much of each substance is present

• To calculate molecular weight

Multiple Choice

Which of the following is a common example of a suspension?

• Saltwater

• Dirt in water

• Air

• Lemonade

Multiple Choice

What makes colloids different from suspensions?

• They contain no atoms

• Their particles settle faster

• They are only found in gases

• Their particles never settle