a chemical process in which substances are changed into different substances, or one substance changes into others substances.
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First question
What is a reaction?
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So write on your board
Are these examples of a chemical reaction? Write Yes or No
1. Combustion of methane gas
2. Breathing in animals
3. Melting of water
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So write on your board
Are these examples of a chemical reaction? Write Yes or No
1. Combustion of methane gas
2. Breathing in animals
3. Melting of water
YES , YES, NO
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What are Reactants/Products of chemical reactions?
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What are Reactants/Products of chemical reactions?
Reactants: The substances that react to form a product
Product: The substance that is made/formed in a reaction
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Question 2:
Classify the substances in this reaction as Products and/or Reactants:
Methane gas is one of the most used substances in our lives to generate heat. It reacts with oxygen to generate heat. After Methane and oxygen react, water and carbondioxide are formed.
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R: methane, oxygen
P: water, carbondioxide
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Methane combustion generates heat?
Atoms in molecules are broken apart and rearranged.
Atoms never disappear/get used up
Depending on the reaction it sometimes requires heat/energy
Sometimes reactions generate heat
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Lavoisier's law of mass conservation
The mass of the reactants, is equal to the mass of the products because mass is never added/depleted in a reaction
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However, Energy/Heat does change after a reaction
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R1: The erlenmeyer becomes freezing cold after the reaction.
It took the heat from the surrounding area to make this reaction possible. It is
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R2: The erlenmeyer becomes very hot after the reaction.
Lesduur is: 80 min
