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someone getting angry
when someone gets angry, they breathe heavily (oxygen). We often say that steam is coming out of the person's ears when they are angry

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Like two kids sharing toys.
ow they are playing with separate toys, but later they will switch toys.

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A relationship breaking up
These people were together, but now they are not.

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It is like two magnets coming together.
Before, they were separate, now they are together.

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switching sides in an argument.
lets pretend the the girl in the middle is siding with the guy on the left. later, she will switch sides in the argument and is now siding with the girl on the right.

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A chemical reaction in which a compound breaks down to make simpler substances.
AB ------> A + B
Ex.
H₂CO₃ → H₂O + CO2
This is the chemical reaction that occurs when you open a can of soda.

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when two different atoms in two different compounds switch places, it is called double displacement.
AB + CD -----> AC + C
Ex.
HCl + NaOH --> H₂O +  NaCl
When aqueous hydrochloric acid is reacted with aqueous sodium hydroxide, the products are aqueous sodium chloride and water.

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A reaction when two or more compounds combine to make a more complex substance.
A + B -----> AB
Ex.
2Cu + O₂ --> 2CuO
2 coppers are reacting with oxygen to make two copper Oxides.

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One element replaces another element in a compound.
AB + C -------> AC + B
Ex.
Zn(s) + 2 HCl(aq) → ZnCl₂(aq) + H₂(g)
This equation is when Zinc metal and hydrochloric acid to produce zinc chloride and hydrogen gas.

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When a substance reacts quickly with oxygen it's called combustion
fuel + Oxygen ------> Carbon dioxide + water
Ex.
CH₄ + 2O₂ → CO₂ + 2H₂O
this is the combustion of methane