8 f compounds and mixtures (whs)

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Information about 8 f compounds and mixtures (whs)
Education

Published on March 31, 2014

Author: PreetiGhosh2

Source: slideshare.net

03/31/14 Compounds and MixturesCompounds and Mixtures W Richards Worthing High School

03/31/14 ElementsElements If a solid, liquid or gas is made up of only one type of atom we say it is an element. For example, consider a tripod made up of iron: These atoms are ALL iron – there’s nothing else in here

03/31/14 CompoundsCompounds Compounds are different to elements. They contain different atoms. Here are some examples: Glucose Methane Sodium chloride (salt)

03/31/14 Some simple compounds…Some simple compounds… Methane, CH4 Water, H2O Carbon dioxide, CO2 Ethyne, C2H2 Sulphuric acid, H2SO4 Key Hydrogen Oxygen Carbon Sulphur

03/31/14 Making compoundsMaking compounds Compounds are made when two or more elements (or compounds) go through a chemical reaction. For example: 1) When carbon reacts with oxygen it usually forms ____ _________ 2) When oxygen reacts with hydrogen it could form ______ 3) When iron reacts with oxygen it could form ______ ______ There are usually “tell-tale” signs to show when a compound is being made, such as bubbling, heat given off, colour changes, fizzing etc. Water, iron oxide or carbon dioxide?

03/31/14 Naming compoundsNaming compounds Rule 1 – When two elements join the end is usually _______ide. e.g. Magnesium + oxygen magnesium oxide 1) Sodium + chlorine 2) Magnesium + fluorine 3) Lithium + iodine 4) Chlorine + copper 5) Oxygen + iron 6) KBr 7) LiCl 8) CaO 9) MgO2 10)KF

03/31/14 Naming compoundsNaming compounds Rule 2 – When three or more elements combine and one of them is oxygen the ending is _____ate e.g. Copper + sulphur + oxygen Copper sulphate 1) Calcium + carbon + oxygen 2) Potassium + carbon + oxygen 3) Calcium + sulphur + oxygen 4) Magnesium + chlorine + oxygen 5) Calcium + oxygen + nitrogen 6) AgNO3 7) H2SO4 8) K2CO3

03/31/14 Naming compoundsNaming compounds Rule 3 – If two identical elements combine then the name doesn’t change This happens with the following elements: 1) H2 2) N2 3) O2 4) F2 5) Cl2 6) Br2 These elements always go around in pairs. For example, hydrogen looks like this:

03/31/14 MixturesMixtures 100 g 105 g Before After

03/31/14 Element, mixture or compound?Element, mixture or compound? Salty water Hydrogen Hydrochloric acid Sodium chloride (salt) Diamond Air

03/31/14 AirAir Air is a mixture… 79% 79% 21% 18%0.03% 1%

03/31/14 Liquid air Separating airSeparating air Air can be separated into the different gases that make it up. To do this you first have to cool air down to -2000 C and turn it into a liquid: Fractional distillation In this chamber the air is gradually heated up again and the different parts of air “distil” off at different temperatures according to their boiling points Oxygen Argon Nitrogen

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