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Fundamentals in Chemistry
Fichas del conjunto (15)
- 1If an atom has 12 protons, how many electrons will it have?12
- 2What is a compound?A substance made up of more than one element
- 3What is another name for positive ions?Cations
- 4What is another name for negative ions?Anions
- 5Why are ions stable or unreactive?They have a full outer shell
- 6What are isotopes?Atoms with the same amount of protons, but a different amount of neutrons
- 7What is the conservation of mass?The idea that you cannot lose matter in a reaction, however you can gain it e.g. when magnesium is burned, it joins with oxygen in the surrounding air
- 8metal carbonate + heat goes to what?metal oxide + carbon dioxide
- 9alkali metal + water goes to what?metal hydroxide + hydrogen?
- 10What is the relative formula mass of a compound?The sum of the relative masses of the atoms regarding the formula of the compound e.g. water would be 2 hydrogens with relative mass of 1 each and oxygen with a relative mass of 16, so the relative mass of water is 18.
- 11How do you work out the percentage of an element in a compound?(relative atomic mass of element/relative formula mass of compound) x 100
- 12What is empirical formula?The simplest ratio of atoms or ions in a compound
- 13How do you calculate empirical formula?Divide the mass of what each element would be in 100g of the compound, by its relative atomic mass to give the ratio of atoms, then divide everything by the smallest number and convert into smallest whole number ratio
- 14What is the yield of a reaction?How much substance you make
- 15How do you calculate percentage yield?(amount of product collected/maximum amount of product possible) x 100
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- GCSE Chemistry Fichas sobre Fundamentals in Chemistry, creado por kate.siena el 29/03/2014.
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