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GCSE Calculation Chemistry

Name ________________________

Abid Bata Ismail

Date Comment Date
Topic Started Completed

Worksheet 1

Worksheet 2

Worksheet 3

Worksheet 4

Worksheet 5

Worksheet 6

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1. Work out the masses of each substance in this reaction. Use the
periodic table.

Calcium + Sulphur Calcium Sulphide


2a. In a reaction involving oxygen gas we use O2 and not O. Why?

2b. What is the Molecular mass of O2

2c. What is the Formula mass of…

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Substance mass




3. Here the molecular formula for some common substances. Work
out the number of atoms in each molecule

HCl Hydrochloric Acid Number of atoms ____________

H2SO4 Sulphuric Acid Number of atoms ____________

Na OH Sodium Hydroxide Number of atoms ____________

Ca(OH) 2…

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4a. Write down the formula equation of this reaction.

Sodium + Hydrochloric Acid Sodium Chloride + Hydrogen gas

4b. Try to balance the equation you have written.

4c. Write down the formula equations of all these

i. Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen gas

ii. Sodium Hydroxide +…

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5b. For the first equation instead of using 2g of hydrogen gas in the
reaction a chemist used 8g. Then how much HCl will be produced in
the reaction?

5c. If instead of using 71g of chlorine gas in reaction two 7.1g was
used. Then how many grams of sodium…

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Number of moles of K= ______________
Number of moles of Cl2 = ______________

After Reaction
Number of moles of KCl = ______________

6c. One mole of chlorine atoms weight 35.5g but one mole of
chlorine molecules weight 71g. Why?

6d. How much does one mole of these substances weight?


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7. What is the concentration of each of these if a substance X is
totally dissolved in each?
(1 mole in 1000cm3 is 1Molar 1M Concentration)

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8. Work out the number of moles of each substance and then the
concentration of these solutions.


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