Sec 2 G2 Chemical Changes

What is combustion?

• A chemical reaction in which a substance is heated in the presence of oxygen to form new substances

• A process in which a substance breaks down into simpler substances upon heating

• A process in which a substance gains oxygen

• A process in which an acid is mixed with an alkali

What is thermal decomposition?

• A process in which an acid is mixed with an alkali

• A chemical reaction in which a substance is heated in the presence of oxygen to form new substances

• A process in which a substance breaks down into simpler substances upon heating

• A process in which a substance gains oxygen

What is oxidation?

• A chemical reaction in which a substance is heated in the presence of oxygen to form new substances

• A process in which a substance breaks down into simpler substances upon heating

• A process in which an acid is mixed with an alkali

• A process in which a substance gains oxygen

What is neutralisation?

• A process in which an acid is mixed with an alkali

• A chemical reaction in which a substance is heated in the presence of oxygen to form new substances

• A process in which a substance breaks down into simpler substances upon heating

• A process in which a substance gains oxygen

Which process involves heating a substance in the presence of oxygen to form new substances?

• Combustion

• Thermal decomposition

• Oxidation

• Neutralisation

Paper burning is a __________________ change. 

• physical
• chemical

Dry ice (solid carbon dioxide) turning into carbon dioxide gas is a 

• physical change
• chemical change

Which example below is a chemical reaction?

• ice melting

• water boiling

• lighting a match

• grape juice freezing

According to the principle of conservation of mass, the number of atoms before a chemical reaction...

• is the same as the number of atoms after the reaction

• is more than the number of atoms after the reaction

• is less than the number of atoms after the reaction

• is more than the number of atoms in the product

How are you feeling today?

• Great

• Good

• Could be better

• Terrible