Topics 1 & 2 Review

Plants need ________from the air for photosynthesis

• oxygen
• soil
• carbon dioxide
• sugar

How many carbon atoms are there in a methane molecule? 

• 0
• 1
• 4
• 5

How many hydrogen atoms are there in a water molecule? 

• 0
• 1
• 2
• 3

Look at the picture. This is a molecule of ammonia, which we use for cleaning. How many atoms are in it? (The total number, not how many types)

• One

• Two

• Three

• Four

Explain the difference between an atom and a molecule.

• One molecule is made of one atom.
• One molecule is always made of different particles.
• One molecule is made of more than one atom.
• One molecule is made of more than two atoms.

Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

What is the total number of atoms in an ammonia (NH₃) molecule?

• 1
• 2
• 3
• 4

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

What is the term for combining 2 or more atoms together?

• atoms
• elements
• molecules
• compounds

When constructing a model of an atom, which two components' masses would you add together to get the atomic mass?

• Protons

• Neutrons

• Electrons

• Atom

• Electron Shells