Chemical equations

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  • Created by: racheon
  • Created on: 01-03-14 15:47
What does a chemical reaction do and not do when talking about the atoms involved?
It doesn't create, destroy or change atoms, it only rearranges them.
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What do reactants become?
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Define species.
Any type of particle that takes part in a chemical reaction.
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Give 5 examples of a species.
An atom, an ion, a molecule, an empirical formula or an electron.
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How are molecules shown?
By their molecular formula.
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What is the molecular formula of nitrogen, oxygen, hydrogen, water and methane?
N₂, O₂, H₂, H₂O, CH₄.
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How are giant structures shown?
By their empirical formula.
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What are 3 things that can be giant structures, and what 3 elements are giant structures?
Ionic compounds, giant covalent structures, and metals. Carbon, silicon and boron.
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What is the empirical formula of sodium chloride, calcium chloride, magnesium hydroxide, and silicon dioxide?
NaCl, CaCl₂, Mg(OH)₂, SiO₂.
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What are the 4 states and their symbols?
Solid (s), liquid (l), gaseous (g), and aqueous (aq).
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Why do you balance equations?
To have the same number of atoms on each side of the equation.
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What are the 3 steps for balancing an equation?
1: Write down the equation using formulae and state symbols, N₂(g)+H₂(g)->NH₃(g). 2: Check the balancing, 2,2 -> 1,3 X. 3: Balancing the equation, N₂(g)+H₂(g)->2NH₃(g) X. N₂(g)+3H₂(g)->2NH₃(g)✓.
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What does a subscript number apply to?
Only the symbol or symbols in the brackets before it.
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How many of each atom does SO₂ and Cu(NO₃)₂ have?
SO₂ has 1S and 2O. Cu(NO₃)₂ has 1CU, N: (1x2)=2. O: (3x2)=6.
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What does a balancing number do?
Multiply everything in the formula.
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How many of each atom does 2SO₂ and 3K₂SO₄ have?
2SO₂ has S: 2x1=2, O: 2x2=4. 3K₂SO₄ has K: 3x2=6, S: 3x1=3, O: 3x4=12.
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Card 2


What do reactants become?



Card 3


Define species.


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Card 4


Give 5 examples of a species.


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Card 5


How are molecules shown?


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