Grade 8 8F Review

What are atoms?

• All the small things in Science

• Tiny particles that make up all matter

• Compounds of different elements

• Molecules of the same element

Atomic Theory says that "atoms are indestructible and cannot be created or destroyed". What does this mean?

• It is very hard to create or destroy atoms.

• New atoms can only be created by the Earth, not people

• Global warming is dangerous because it can destroy atoms and we cannot make new ones.

• There are the same number of atoms now as there was 1,000,000 years ago.

How many unique(not the same kinds) of atoms are there in water?

• 3: 2 kinds of hydrogen, 1 kind of oxygen

• 3: 2 kinds of oxygen, one kind of hydrogen

• 2: 1 kind of hydrogen, 1 kind of oxygen

• 1: 1 kind of water.

Describe the bonding of atoms in water

• 1 hydrogen bonded to 1 hydrogen and 1 oxygen

• 1 hydrogen bonded to 2 oxygen

• 1 oxygen bonded to 2 hydrogen

• 1 water bonded to itself

What happens during a chemical reaction?

• The atoms in the reactants rearrange to form the products

• The atoms in the products rearrange to form the reactants

• The atoms in the reactants change to form the atoms in the products

• The atoms in the products change to form the atoms in the reactants

Different elements have different properties because

• They have different theories

• They have different symbols

• The have different names

• They have different atoms

Which are examples of physical properties?

• Flammability

• Conduction of electricity

• Strength

• Acidity/alkalinity (pH)

What are the IUPAC rules for symbols on the periodic table?

• Each element's unique symbol is the first 2 letters of its name.

• Each element has a unique 1 or 2 letter symbol and the first letter is capitalized

• Each element has a unique 1 or 2 letter symbol and the second letter is capitalized

• Symbols can be any number of letters, as long as the unique combination is not used for another element.

Which describes chemical reactions?

• Nothing happens

• New substances form

• No new substances form

• A substance changes state

Which choices are chemical properties?

• Flammability

• Acidity/alkalinity (pH)

• Colour

• Flexability