C3 3.5 / 5 based on 3 ratings ? ChemistryGCSEEdexcel Created by: IzzieCaitlinCreated on: 20-01-13 17:26 In a chemical reaction, what are reactants made into? Products 1 of 33 What is the reaction time? The time taken for the reaction to finish. The shorter the reaction time, the faster the reaction 2 of 33 What does the rate of reaction measure? How much product is formed in a fixed period if time 3 of 33 In reactions that release gas, how can the reaction rate be measured? By monitoring the decrease in mass and collecting the gas made. (Both in a given time period) 4 of 33 What is the limiting reactant? The reactant not in excess that gets used up by the end of the reaction 5 of 33 When will chemical reactions take place? When reactant particles hit or collide with each other 6 of 33 How can a reaction be made to go faster? (3)` By increasing the temperature, concentration or pressure 7 of 33 What does the rate of reaction depend on? The number of collisions between the reacting particles 8 of 33 What does breaking up a block into smaller pieces increase? The surface area 9 of 33 What can increase the rate of reaction? A catalyst 10 of 33 What does a catalyst do? Changes the rate of reaction and is unchanged at the end of the reaction 11 of 33 Where can the relative atomic mass of elements be found? In the periodic table 12 of 33 What is conservation of mass? Where the total mass of the reactants equals the total mass of the products 13 of 33 Why is mass conserved? Because atoms cannot be created or destroyed, only rearranged into different compounds 14 of 33 What is the percentage yield of a reaction? The amount of product made compared to the amount we expect to make 15 of 33 What can relative formula mass calculations be used to find? How much product should be made in a chemical reaction 16 of 33 What is the formula for percentage yield? percentage yield = actual yield/predicted yield x 100 17 of 33 What is atom economy? A way of measuring the amount of atoms that are wasted or lost when a chemical is made 18 of 33 What do exothermic reactions do? Give out energy to the surrounding (releases energy) 19 of 33 What do endothermic reactions do? Take in energy from the surrounding (absorbs energy) 20 of 33 What are chemicals that are needed in large amounts usually made by? A continuous process 21 of 33 What are chemicals needed in small quantities made using? Batch processing 22 of 33 What are all made from carbon? Diamond, graphite and buckminsterfullerene 23 of 33 What can carbon atoms do? Join with themselves in different ways so that different structures can form 24 of 33 What are allotropes? Different structures of the same element 25 of 33 What can carbon be used the make very small structures of? Nanotubes 26 of 33 What is known about diamond? That it's the hardest natural substance and has a very hight melting and boiling point 27 of 33 What are continuous processes used to make? Chemicals such as ammonia 28 of 33 What are batch processes used to made? Pharmaceutical drugs 29 of 33 How are chemicals extracted form plants? By crushing, boiling, dissolving and chromatography 30 of 33 What costs are there in the making and developing a pharmaceutical drug? (5) Labour, raw materials, energy, research and testing 31 of 33 What is colourless and doesn't conduct electricity? Diamond 32 of 33 What does conduct electricity and is slippery? Graphite 33 of 33
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