Elements, mixtures and compounds 0.0 / 5 ? ChemistryElements, mixtures and compoundsOtherOther Created by: Shreya KochharCreated on: 25-01-14 16:23 What is an element The simplest form of a substance that cannot be split ino anything simpler 1 of 23 What is a compound? Two or more substance chemically joined or combined via a chemical reaction that are not easily separated 2 of 23 What is a mixture? Two or more substances not chemically combined that are easily separated 3 of 23 What is an atom? The simplest particle from which all matter is composed 4 of 23 What is a molecule? Two or more atoms chemically joined or combined 5 of 23 What happens in a chemical reaction? New substances are formed 6 of 23 What happens in a physical change? No new substances are formed 7 of 23 What is conserved in both types of change? Mass 8 of 23 What happens during a chemical reaction? Atoms can be neither created nor destroyed 9 of 23 What is thermal decomposition? breaking down of a substance using heat 10 of 23 What is precipitation? the formation of an insoluble substance from two soluble substances 11 of 23 What is neutralisation? the reaction between an acid and an alkali 12 of 23 What is direct combination? the formation of a compound directly from its elements 13 of 23 What is exothermic? a reaction that gives out heat 14 of 23 What is enothermic? a reaction that takes in heat 15 of 23 What happens when metals burn in oxygen? They form oxies, these dissolve in water to form alkalis 16 of 23 What happens when non metals burn in oxygen? Teh form oxides, these dissolve in water to form acids 17 of 23 What are the three elements required for a fire? Oxygen, Heat and Fuel 18 of 23 What is combustion? The term for a substance burning. When burning, a fuel reacts with oxygen in the air 19 of 23 What happens when hydrogen combusts? Water is formed 20 of 23 Water turns cabalt chloride paper what colour? Blue to pink 21 of 23 What happens if a fuel contains both hydrogen and carbon? It will produce water and carbon dioxide as it burns 22 of 23 What do you call fuels containing both hydrogen and carbon? Hydrocarbons 23 of 23
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