How much?

yusanr98
Flashcards by yusanr98, updated more than 1 year ago
yusanr98
Created by yusanr98 about 7 years ago
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GCSE Chemistry Additional Science (AQA) Flashcards on How much?, created by yusanr98 on 04/04/2014.

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Question Answer
What is an atom's atomic number and mass number? The atomic number of an atom is its number of protons.
What are the relative masses of protons and neutrons? The relative mass of protons and neutrons is 1.
What are isotopes? Isotopes are atoms of same element with different numbers of neutrons.
How 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.
What 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.
What does the yield of a chemical reaction describe? The yield of a chemical reaction describes how much product is made.
What 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.
Why 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.
What is a reversible reaction? The products of the reaction can react to make the original reactants.
What are food additives? Food additives are substances added to food in order to improve its appearance, taste and how long it will keep.
How can we identify food additives? Food additives can be identified by using paper chromatography.
Gas chromatography The 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.
Mass spectrometer A 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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