Balancing a formulae: count the amount each element on both sides and change the numbers in front of the symbols to balance the equation.

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What do word equations show?

Word equations show which chemicals react together (the reactants) and which are produced (the products).

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What does the formula show?

The formula of a compound shows how many of each type of atom join together to make the compound.

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What do symbol equations show?

Symbol equations work out the masses that will react or be produced.

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What are the four state symbols?

State symbols: (s) solid (g) gas (l) liquid (aq) aqueous

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Why may you not get the calculated amount of mass?

It's not always possible to get the entire calculated amount as reversible reactions may not be completed, some reactants may react in an unexpected way and some products may be lost.

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What are the rules of mass in a reaction?

Mass is never lost or gained in a reactions, it's conserved

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What is the empirical formulae?

The empirical formulae is the simplest ration of compounds.

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How do you convert from an empirical formulae to a molecular formulae?

To covert from a empirical formulae to a molecular formulae you do the Mr divided by the total mass in the empirical formulae

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What are the steps to working out the mass?

1. Balance the equations. 2. Write the given mass. 3. Write the Mr mass.

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How do you work out the reacting mass?

Unknown mass= mass / Mr of known compound x Mr of unknown compound

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What is the easiest way to calculate masses?

If you are given the mass of the reactant and product, you can use ratio calculations in mass questions

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How do you calculate the % composition?

(Mr / total mass) x 100 = %

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What is the concentraion?

The strength of a solution, how much solute is dissolved in the solvent.

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What are the concentration conversions?

1 L= 1dm3 1dm3=1000ml 1ml = 1cm3

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How do you work out the molar concentration?

Moles of solute / dm3 of solvent

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How do you work out the percentage concentration?

% = mass of solute / 100ml of solvent

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How do you calculate the g/l concentration?

Mass of solute / dm3 of solvent

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Other cards in this set

Card 2

Front

What do word equations show?

Back

Word equations show which chemicals react together (the reactants) and which are produced (the products).

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