Chemical equations

?
  • 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.
1 of 16
What do reactants become?
Products.
2 of 16
Define species.
Any type of particle that takes part in a chemical reaction.
3 of 16
Give 5 examples of a species.
An atom, an ion, a molecule, an empirical formula or an electron.
4 of 16
How are molecules shown?
By their molecular formula.
5 of 16
What is the molecular formula of nitrogen, oxygen, hydrogen, water and methane?
N₂, O₂, H₂, H₂O, CH₄.
6 of 16
How are giant structures shown?
By their empirical formula.
7 of 16
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.
8 of 16
What is the empirical formula of sodium chloride, calcium chloride, magnesium hydroxide, and silicon dioxide?
NaCl, CaCl₂, Mg(OH)₂, SiO₂.
9 of 16
What are the 4 states and their symbols?
Solid (s), liquid (l), gaseous (g), and aqueous (aq).
10 of 16
Why do you balance equations?
To have the same number of atoms on each side of the equation.
11 of 16
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)✓.
12 of 16
What does a subscript number apply to?
Only the symbol or symbols in the brackets before it.
13 of 16
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.
14 of 16
What does a balancing number do?
Multiply everything in the formula.
15 of 16
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.
16 of 16

Other cards in this set

Card 2

Front

What do reactants become?

Back

Products.

Card 3

Front

Define species.

Back

Preview of the front of card 3

Card 4

Front

Give 5 examples of a species.

Back

Preview of the front of card 4

Card 5

Front

How are molecules shown?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Atoms and reactions resources »