y10D UNIT 4 and 5 bingo

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created 2 years ago by terelaura
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teresa and laura
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chemistry
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4.1 what does every element have of his own ?

every element has a chemical symbol

2

4.1 how can we work the formula of a compound?

the formula of a compound can be worked out from the valency of the elements present

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4.2 what are the two types of formulas for molecules and what do each one shows ?

the molecular formula: shows the number of each type of atom present and the empirical formula: shows the simplest whole number ratio of the different atoms present.

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4.2 how can we find the formula of an ionic compound

the formula of an ionic compound can be worked out using the charges on the ions

5

4.3 in a chemical reactions the mass of the product is always equal to .......

the mass of the reactants

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4.4 what is the name given to the ions that do not take part in the reaction ?

spectator ions

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5.1 for what do we use simple proportion ?

we can use it to calculate the mass of a product formed if we have enough information

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5.2 what is the mass of sodium hydroxide in 0.5 moles of sodium hydroxide?

Mr of NAOH = 40

to find the mass we need to multiply the number of moles (0.5) by the molar mass (40) which would give you 20 g NaOH

answer = 20 g of NaOH

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5.3 how can we work out which reagent is limited ?

we can work it out by comparing the number of moles of each reactant.

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5.4 how can we find the percentage of a mass of an element in a compound

it can be found using the relative formula masses and relative formula masses