Karteikarten
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Karten in diesem Stapel (13)
- 1What is an atom's atomic number and mass number?The atomic number of an atom is its number of protons.
- 2What are the relative masses of protons and neutrons?The relative mass of protons and neutrons is 1.
- 3What are isotopes?Isotopes are atoms of same element with different numbers of neutrons.
- 4How can we calculate the relative formula mass of a compound from the elements?We can work out the relative formula mass of a compound by adding up the relative atomic masses of the elements in it, in the ratio shown by its formula.
- 5What do balanced symbol equations tell us about chemical reactions?Balanced symbol equations tell us the number of moles of substances involved in a chemical reaction.
- 6What does the yield of a chemical reaction describe?The yield of a chemical reaction describes how much product is made.
- 7What are the factors affecting the yield of a chemical reaction?Factors affecting the yield of a chemical reaction include product being left behind in apparatus and difficulty separating the products from the reaction mixture.
- 8Why is it important to achieve a high yield in industry and to waste as little energy as possible?It is important to maximise yield and minimise energy wasted to conserve the Earth's limited resources and reduce pollution.
- 9What is a reversible reaction?The products of the reaction can react to make the original reactants.
- 10What are food additives?Food additives are substances added to food in order to improve its appearance, taste and how long it will keep.
- 11How can we identify food additives?Food additives can be identified by using paper chromatography.
- 12Gas chromatographyThe process of separating the components in a mixture by passing the vapours through a column and detecting them as they leave the column at different times.
- 13Mass spectrometerA machine that can be used to analyse small amounts of a substance to identify it and to find its relative molecular mass.
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- GCSE Chemistry Additional Science (AQA) Karteikarten am How much?, erstellt von yusanr98 am 04/04/2014.
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