2.4: Chemical Reactions

What is a chemical reaction?

• A chemical reaction is a process that leads to the separation of chemical substances.
• A chemical reaction is a process that leads to the change of one set of chemical substances to another.

• A chemical reaction is a process that leads to the destruction of chemical substances.
• A chemical reaction is a process that leads to the formation of the solutes that is the same as before.

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Why is this a chemical reaction?

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In the combustion reaction, which ones are the reactants?

• hydrocarbon

• oxygen

• carbon dioxide

• water

• heat and light

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In the combustion reaction, which ones are the products?

• hydrocarbon

• oxygen

• carbon dioxide

• water

• heat and light

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When cooking gas burns into oxygen, carbon dioxide and water are formed. Which is the reactant?

• water

• oxygen

• heat

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When we mix magnesium metal with oxygen, we see a bright white flame and a white powder. Which is the product?

• the flame

• the powder

• oxygen

• magnesium metal

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When we mix vinegar and baking soda, carbon dioxide gas and water are formed. What evidence do we have that a chemical reaction has taken place?

• We can taste it to check for water.

• We can see a colour change.

• We can see gas bubbles form.

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Organize these options into the right categories

Groups:

(a) Physical Changes

,

(b) Chemical Changes

• 
• 
• 
• 
• 
• 

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Eggs rotting is an example of a chemcial reaction because...

• a gas that smells bad is formed

• the egg shrinks

• the egg yolk and egg white separate from each other

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Which of the following is NOT evidence that a chemical reaction has occured?

• formation of liquid droplets above a solution

• colour of the solution changing from clear to yellow

• formation of smoke when a candle burns

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