8E Combustion

A _______ is a chemical substance from which stored energy can be transferred usefully to make things happen. Choose the BEST answer

• gas

• fuel

• glucose

• food

Hydrogen can be used in fuel cells to release energy by racting with

• gas

• oxygen

• water

• carbon

The reaction of hydrogen in fuel cells is shown here:  hydrogen + oxygen → water

Identify the reactant(s) in the equation

• hydrogen

• oxygen

• water

• energy

What is another word for a 'burning' reaction?

• fuel cell

• combustion

• reaction

• respiration

Identify possible ways energy can be transferred during combustion?

• Sound

• Feel

• Light

• Heat

What elements are present in hydrocarbons (fossil fuels)?

• Carbon

• Hydrogen

• Hydros

• Water

What is the product(s) of a combustion reaction of a hydrocarbon?

• fuel

• oxygen

• water

• carbon dioxide

The image on the left shows the test for respiration using limewater. What is happening in the image?

• The water produced in respiration causes the limewater to become cloudy

• The carbon dioxide produced in respiration causes the limewater to become cloudy

• The water produced in respiration causes the limewater to become clear

• The carbon dioxide produced in respiration causes the limewater to become clear

Cobalt chloride paper (pictured to the left) could also be used to test for combustion. How would this work?

• Cobalt chloride paper turns from blue to pink in the presence of a fuel

• Cobalt chloride paper turns from blue to pink in the presence of oxygen

• Cobalt chloride paper turns from blue to pink in the presence of carbon dioxide

• Cobalt chloride paper turns from blue to pink in the presence of water

Chemical names of common substances are based on their...

• sizes

• elements

• geographic locations

• common names