Year 9 Chemistry

A universal indicator measures ___________.

• Acidity
• pH
• Ions
  Ions
• Alkali levels

A chemical reaction that produces energy is a /an

• endothermic reaction
• exothermic reaction 
• energy
• chemical reaction 

What is the law of Conservation of Mass?

• A measure of how much mass is created or destroyed. 
• Mass can neither be created nor destroyed during a chemical reaction. 

The compounds or elements present at the end of a reaction 

• reactants
• catalyst
• products
• energy 

The compounds and elements that are present at the beginning of a reaction:

• reactants
• catalyst
• products
• energy 

A chemical change happens when...

• a substance is changed at the atomic level 
• bonds are broken and formed 
• a new substance is made
• all of the above! 

What kind of change is a change of state?

• Physical
• Chemical 

The element symbol for Potassium is ...

• P
• Po
• Pt
• K

Sodium's chemical symbol is...

• S
• So
• Na
• K

One example of a chemical change is

• filtering a mixture
• burning wood
• boiling water
• crushing a can