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Year 11: Chemical Reactions 1.2
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Where does the mass go when something burns?
Into gases released into the air.
Why does a yellow flame produce soot?
There is not enough oxygen, so incomplete combustion occurs.
Why does a candle go out under a jar?
The oxygen runs out.
Is this balanced: H₂ + O₂ → H₂O? Why?
No. There are 2 oxygen atoms on the left but only 1 on the right.
Why do we balance equations?
To show conservation of mass / same number of atoms on both sides.
What happens to atoms in a reaction?
They are rearranged into new substances.
What type of combustion can be seen using the yellow flame?
Incomplete Combustion
Which type of combustion uses the blue flame on a bunsen burner?
Complete combustion
What does the small number in a formula mean? e.g
How many atoms of that element there are.
What is combustion?
A reaction where something burns in oxygen and releases energy.
What happens to mass in a reaction?
The total mass stays the same.
Why is CO dangerous?
It stops oxygen being carried in the blood.
What is incomplete combustion?
Burning with not enough oxygen.
Why mass stays the same in a reaction?
Atoms are rearranged, not created or destroyed.
CO is safe to breathe - T/F
F
Atoms are rearranged in reactions - T/F?
T
A yellow flame is complete combustion - T/F?
F
COâ‚‚ has 2 carbon atoms - T/F?
F
Mass can disappear in a reaction - T/F?
F
Atoms are = ?
Tiny particles that make up substances.
Mass is = ?
The amount of matter in something.
Combustion needs = ?
Oxygen.
Oâ‚‚ = ?
2 oxygen atoms / oxygen gas.
COâ‚‚ = ?
Carbon Dioxide
CO =?
Carbon Monoxide
What does COâ‚‚ mean? (What atoms are present)
1 carbon atom and 2 oxygen atoms
What does Hâ‚‚O mean? (what atoms are present?)
2 hydrogen atoms and 1 oxygen atom.
Give one sign of a chemical reaction
Colour change Gas/bubbles Temperature change Solid forms
What are products?
The new substances formed in a reaction.
What are reactants?
The starting substances in a reaction.
What is a chemical reaction?
A process where substances change into new substances.
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