Chemistry - starter questions

1

Add the mass of all the atoms in the compound

2

Protons and neutrons

3

(x/total) x100

4

A positive ball of mass with impeded negative (electrons) charges

5

The reactivity as you go down group 1

6

It is arranged by atomic number / increase number of protons
(atomic number)

Green pen your answers

% yield and atoms

No atoms are gained or lost in a chemical reaction.
However they may not end up in the compound you
want them to.

CH4 (g) + H2O (g) → 3H2 (g) + CO (g)

Atom economy is the idea of measuring how much
of the starting material ends up as useful products.

Atom economy = Mr of product / Mr of all reactants
x100

% yield and atoms

CH4 + H2O → 3H2 + CO

Mr of CH4 = 16
Mr of H2O = 18

Mr of H2 = 2

% yield and atoms

CH4 + H2O → 3H2 + CO

However there are 3H2 atoms.

2 x 3 = 6

6/34 x100 = 17.647

% yield and atoms

Your turn
% yield and atoms

KO 3

In most reactions there is less product made then
theroised.

This can be for various reasons such as:
- Reaction not going till compilations
- Some of the product may be lost when separated

e.g. filtration.

- Sometimes the an unexpected reaction may

occur.

% yield and atoms

KO 3

% yield and atoms

KO 3

% yield and atoms

Explanation Slide...

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Explanation Slide...

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KO 1

You have 40 minutes to complete SLOP
1.

No questions for the first 5 minutes

2.

Golden silence

3.

Answer all teacher feedback with a green pen

% Yield

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