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Mrs Serafini – Chemistry Title page for new topic (whole page). C1: Carbon Chemistry. 04:38. Writing equations L.O. I know how many elements are in a compound and how many atoms of each there are.

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Mrs Serafini – ChemistryTitle page for new topic (whole page)

C1: Carbon Chemistry

04:38


  • Writing equations

  • L.O.

  • I know how many elements are in a compound and how many atoms of each there are.

  • I can recognise the reactants and products from a word equation and can write the word equation of a reaction.

05/10/2014

4:38 AM


Chemists use formula to show:

  • the different elements in a compound.

  • the number of particles of each element in a substance.

    eg.

    NaCl CH4

sodium chloride

methane

one

chlorine

one

sodium

one

carbon

four

hydrogen

4:38 AM


water

sulphuric acid

four

oxygen

one

sulphur

two

hydrogen

two

hydrogen

one

oxygen

H2O H2SO4

4:38 AM


If brackets are put around part of the formula remember to multiply everything inside the bracket by the number outside.

Al2(SO4)3 Mg(NO3)2

aluminium sulphate

magnesium nitrate

one

magnesium

twelve

oxygen

two

aluminium

three

sulphur

six

oxygen

two

nitrogen

4:38 AM


Molecules

  • Some elements exist as molecules.

  • The atoms in each molecule of an element are the same.

4:38 AM


Atoms combining

When atoms of two or more elements combine they form a compound.

4:38 AM


Chemical formula

  • The chemical formula of a substance shows the numbers of different types of atoms it contains.

  • The chemical formula of water is H2O.

  • A molecule of water contains two hydrogen atoms and one oxygen atom.

4:38 AM


Chemical formula

  • The chemical formula of hydrogen sulphide is H2S. What atoms does a molecule of hydrogen sulphide contain?

  • The chemical formula of ammonia is NH3. What atoms does a molecule of ammonia contain?

4:38 AM


Writing word equations

what we

make

what we

start with

REACTANTS

PRODUCTS

4:38 AM


Sulphuric Acid

Nitric Acid

+

+

Magnesium

Magnesium

Magnesium Sulphate

Magnesium Nitrate

+

+

Hydrogen

Hydrogen

Reactants

Reactants

Products

Products

4:38 AM


Writing word equations

  • Each of the bullet points below describes a chemical reaction. Write a word equation to represent each one. In some you will have to work out the name of the product(s).

  • When carbon is heated in oxygen, carbon dioxide is

  • formed

carbon

+ oxygen

carbon dioxide

4:38 AM


  • When magnesium reacts with hydrochloric acid, magnesium chloride and hydrogen are made.

magnesium

magnesium

chloride

+ hydrogen

+ hydrochloric

acid

4:38 AM


  • Plenary Questions

  • State how many elements there are in the

  • following compounds?

    • CO2

    • 2. HNO3

    • 3. CaO

    • 4. CaCO3

    • 5. H2SO4

4:38 AM


Using the whiteboards write ‘E’ if an element or ‘C’ if a compound

1

2

3

4

6

5

4:38 AM


11

12

7

8

9

9

7

8

12

10

11

4:38 AM


State the number of atoms of the element in the compounds shown below.6. The no. of Ca in Ca(NO3)27. The no. of H in H2SO48. The no. of S in H2SO49. The no. of N in NH3NO310. The no. of N in Al(NO3)3

1 x Ca

2 x H

1 x S

2 x N

3 x N

4:38 AM


Hydrochloric Acid

+

Magnesium

Magnesium Chloride

+

Hydrogen

11. Name a reactant from the equation below which begins with ‘M’.

12. State the product form the equation below which begins with ‘H’.

4:38 AM


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