Y7 Chemical Reactions

A candle burning is an example of a _________________________

• physical reaction

• condensation

• neutrons

• chemical reaction

What indicates a chemical reaction occurred?

• heat or light is released

• gas (bubbles) produced

• color change

• all of the above

How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change results in a new substance

Which of the following IS a physical change?

• Getting a haircut

• Iron going rusty

• A compound forming

• Milk going sour

Which of the following is evidence of a chemical reaction?

• bubbles being produced

• water changing to ice

• saltwater

• paper being cut in half

a copper penny turning greenish after a few years is a...

• Chemical Change

• Physical Change

A substance that is formed when two or more elements are chemically joined during a chemical reaction is a(n)...

• Product

• Compound

• Molecule

• Atom

Is wood burning a physical or chemical change?

• Physical 
• Chemical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

How do you test for carbon dioxide gas?

• Turns limewater milky
• Relights a glowing splint
• Makes a squeaky pop with a splint
• Bleaches damp litmus paper

How do you test for oxygen gas?

• Makes a squeaky pop with a lit splint
• Relights a glowing splint
• Bleaches damp litmus paper
• Turns limewater milky