1. Formulae and Reaction Quantities
S3 Chemistry
Unit 2 Topic 2

2. Naming and Word Equations
Learning Intentions:
I remember how to name compounds
I know what a word equation is
I know how to write a word equation
Success Criteria:
I can name compounds based on the elements it contains.
I can write a word equation from a description of the reaction

3. Glossary
Molecule
Formed when two or more atoms join together chemically.
Compound
A molecule that contains at least two different elements (all compounds are molecules but not all molecules are compounds)
Gram Formula Mass
Mole
Concentration

4. Starter
What is the name given to the attractive forces which hold atoms together in molecules?
What is the name given when different elements are put together but do not react and join?
What is the name given when different elements are mixed and they do react and join?
What are the five signs of a chemical reaction?
What is the difference between a chemical reaction and a physical change?

5. Carbon dioxide gas 1) Diatomic element 2) Monatomic element 3)Molecule
4) Diatomic compound
5) Compound
6) Mixture
7) Element
Carbon dioxide is a compound and the fire extinguisher would contain millions of carbon dioxide molecules.

6. Helium gas 1) Diatomic element 2) Monatomic element 3)Molecule
compound
5) Compound
6) Mixture
7) Element
Helium is an monatomic element because helium atoms do not bond to any other atoms. The balloon is filled with the element helium.

7. Oxygen gas 1) Diatomic element 2) Monatomic element 3)Molecule
compound
5) Compound
6) Mixture
7) Element
Oxygen is a diatomic element because it is a molecule made of the same atoms. So we could also say that the canister is filled with the element oxygen.

8. Sparkling (fizzy) water
1) Diatomic element
2) Monatomic element
3)Molecule
4) Diatomic compound
5) Compound
6) Mixture
7) Element
Sparkling water is a mixture of water molecules and carbon dioxide molecules, which are both compounds.

9. The air around you 1) Diatomic element 2) Monatomic element 3)Molecule
4) Diatomic compound
5) Compound
6) Mixture
7) Element
It is a mixture of gas molecules of the diatomic elements nitrogen (N2) and oxygen (O2). It contains the monatomic element argon (Ar) and trace amounts of other noble gas atoms. It will have compounds of carbon dioxide (CO2) and water (H2O) vapour. 

10. Hydrogen Chloride 1) Diatomic element 2) Monatomic element 3)Molecule
4) Diatomic compound
5) Compound
6) Mixture
7) Element
Hydrogen Chloride (HCl) is a diatomic compound but please remember not all compounds are diatomic. For example magnesium chloride MgCl2.
hydrogen and chlorine react together to produce hydrogen chloride (HCl ).

11. Sucrose has the formula C12H22O11
Carbon Snake
Dehydration of sugar Demonstration
Sucrose has the formula C12H22O11
What will I be left with ?

12. Carbohydrate
Carbon
hydrogen
(ate) Oxygen

13. Hydrogen Oxide
Hydrogen
Oxygen

14. Naming Compounds ‘-ide’ rule ‘-ate’ and ‘-ite’ rule
Compounds made from two elements always end in -ide
‘-ate’ and ‘-ite’ rule
Compounds containing three elements, one of which is always oxygen end in -ate or -ite
One exception is -OH containing compounds
E.g. LiOH is called Lithium Hydroxide

15. Elements Present
Compound Name
Sodium, Sulphur, Oxygen
Potassium nitrate
Calcium, Carbon, Oxygen
Magnesium chloride
Potassium, Oxygen
Sodium, Hydrogen, Oxygen

16. Word Equations
This is a representation of a chemical reaction

17. Magnesium reacts with oxygen to produce magnesium oxide
Magnesium reacts with oxygen to produce magnesium oxide. Reactants: Products: Magnesium Magnesium oxide Oxygen

18. What to remember
1. We use not ‘=‘
The arrow means ‘reacts to give’

19. Which is correct?
Hydrogen gas is burned in oxygen and water is formed. Hydrogen + Oxygen Water Hydrogen + Oxygen = Water

20. What to remember
2. Reactants Products

21. Which is correct?
Calcium carbonate reacts with hydrochloric acid producing calcium chloride, water and carbon dioxide
Calcium + Hydrochloric Calcium + Water + Carbon
carbonate acid chloride dioxide Or
Calcium carbonate + Hydrochloric acid Calcium chloride + water + Carbon dioxide

22. The elements present in the reactants are also present in the products

23. Write word equations for the following reactions…
Carbon monoxide burning to form carbon dioxide.
Methane burning to form water and carbon dioxide.
Hydrogen sulphide burning to form water and sulphur dioxide.
Sodium chloride being produced from sodium and chlorine.
When hot lithium is placed in bromine vapour the two elements react to produce lithium bromide.
When sodium is heated in a Bunsen flame it bursts into flames, combining with oxygen to form sodium oxide.
Hydrogen and chlorine combine explosively in bright light to produce hydrogen chloride.
Silicon hydride burns spontaneously in air to produce silicon dioxide and water.
Calcium reacts quickly with water to produce calcium hydroxide and hydrogen.