combustion

Why do we need food to break apart the food we eat?

• So it can fit into our stomachs

• So our bodies can use the nutrients from the food

• So liquids can be separated from solids

• So that our bodies' enzymes have something to do.

Where does digestion begin?

• Our teeth

• Our stomach

• The esophogus

• Small intestines

Chewing is an example of what type of digestion?

• Dental

• Fragmentary

• Chemical

• Mechanical

Place the following events in sequence: A) Food enters your large intestines

B) Food enters your small intestines

C) Food enters your esophagus

• A, B, C

• C, B, A

• C, A, B

• B, A, C

A combustion reaction is when

• A fuel burns realeasing heat and light energy
• A substance burns and goes black

The reactants of all combustion reactions are

• Fuel and Water
• Fuel and Oxygen
• Fuel and heat

When a fuel is burnt the gases released are

• Oxygen and Carbon
• Carbon dioxide and Water
• Sulfur dioxide

The test for carbon dioxide is

• Limewater turning cloudy
• Cobalt chloride paper turning from blue to pink

The test for water is

• Limewater turning cloudy
• Cobalt chloride paper turning from blue to pink

Combustion reactions are an example of an exothermic reaction because

• they release light
• they release heat
• they give out smoke