Chemistry 0.0 / 5 ? ChemistryStructure and bondingGCSEAQA Created by: George_Brown01Created on: 28-01-17 16:52 What is the relative mass of a neutron? 1 1 of 15 What is an atoms mass number? The mass number of an atom is the total number of protons and neutrons it contains. 2 of 15 What is an Isotope? Isotopes are the atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers. 3 of 15 What is meant by the term yield? The actual yield is the mass of product made when the reaction is carried out for real. 4 of 15 What is chromatography used for? Chromatography can be used to separate mixtures of coloured compounds. 5 of 15 What is a mass spectrometer used for? The mass spectrometer can be used to identify substances quickly and accurately, and in very small amounts. 6 of 15 How do you work out the rate of reaction? Product formed / time taken. 7 of 15 What two things need to happen for particles to react? The reactant particles must collide. But collisions with too little energy do not produce a reaction. 8 of 15 State 4 ways to speed up a chemical reaction? Temperature, Concentration, Surface area, pressure 9 of 15 Why do catalysts not need to be replaced? Because they do not get used up. 10 of 15 What is exothermic? A reaction that releases heat. 11 of 15 What is endothermic? A reaction that absorbs heat. 12 of 15 What is the PH of an acid? Anything less than 7. 13 of 15 What does the symbol (aq) stand for? Aqueous (dissolved in water) 14 of 15 What is a precipitate? A solid produced in a liquid in this way is called a precipitate. 15 of 15
Comments
No comments have yet been made