Presentation on theme: "9E Reactions of metals and metal compounds"— Presentation transcript:
19E Reactions of metals and metal compounds Useful metalsMetals and metal compoundsSalts
29E Reactions of metals and metal compounds Useful metals
3Complete the table. Answer ‘yes’ or ‘no’. 9E Properties of metalsWe use metals for bridges and cars, for jewellery, and even inside our bodies. What’s so special about metals?Complete the table. Answer ‘yes’ or ‘no’.propertytypical of metals?good conductor of heatpoor conductor of electricityshiny surfacecan be beaten into flat sheetsdoes not react with oxygengas at room temperatureyesnoyesyesnonoGive three more properties of metals.
4Match up the properties with the way we use each metal. 9E Which metal?There are lots of metals, all slightly different. How do we choose which metal to use for which job?Match up the properties with the way we use each metal.use 1 titanium for artificial hip joints2 copper in electrical circuits3 gold for jewellery4 lead for weightsproperty of metal C very light and strong, and unreactiveD cheap and a good conductor of electricityB shiny and unreactive, so it does not tarnishA has a high densityproperty of metal A has a high densityB shiny and unreactive, so it does not tarnishC very light and strong, and unreactiveD cheap and a good conductor of electricity
5There is something odd about these substances. What is it? 9E Odd ones outRead all about it!There is something odd about these substances. What is it?Mercury: a liquid metal that conducts heat and electricity well. It is very dense and was used during the Spanish Inquisition to kill people. Victims were forced to swallow mercury which is very poisonous.Graphite: a black powder that conducts electricity. It feels quite slippery and is used in pencils. A stick of graphite leaves a smear on a rough surface like paper as it passes over it. But is it a metal?
6Metals and metal compounds 9E Reactions of metals and metal compoundsMetals and metal compounds
7Many metals react with acids to produce a gas. But which gas is it? 9E I’ll name that gas in...Many metals react with acids to produce a gas. But which gas is it?And the gas is... Hydrogen!CLUE 3 The gas is not oxygen.CLUE 1 Think about the formulae for acids: sulphuric acid H2SO4, hydrochloric acid HCl, nitric acid HNO3.CLUE 2 The gas burns with a popping sound.
8How do metals react with acids? Complete this equation. 9E Metals and acidsHow do metals react with acids? Complete this equation.metal + hydrochloric acid?+Write a word equation for each metal with hydrochloric acid:calciummagnesiumzincironleadcoppersilverWhat evidence would tell you this reaction has occurred?
9Metals react with acids to produce a salt and hydrogen. 9E More metals, more acidsMetals react with acids to produce a salt and hydrogen.Which salts would be made here?metalsalt produced in hydrochloric acidsalt produced in sulphuric acidmagnesiumzincironmagnesium chloridemagnesium sulphatezinc chloridezinc sulphateiron chlorideiron sulphateWrite a word equation for the reaction of magnesium with nitric acid.
10In any chemical reaction the atoms are rearranged. 9E What happens to the atoms?In any chemical reaction the atoms are rearranged.Metals react with acids like this.zinc hydrochloric acidZn HCl+zinc sulphuric acidZn H2SO4+zinc sulphate hydrogenZnSO H2+zinc chloride hydrogenZnCl H2+Hydrogen bubbles appear because hydrogen atoms leave the acid and pair up to form hydrogen molecules.
11And the gas is... Carbon dioxide! CLUE 3 The gas is not hydrogen. 9E I’ll name that gas in...Metal carbonates react with acids to produce a gas. But which gas is it?And the gas is... Carbon dioxide!CLUE 3 The gas is not hydrogen.CLUE 1 The formulae for carbonates: sodium carbonate Na2CO3, copper carbonate CuCO3, zinc carbonate ZnCO3.CLUE 2 The gas puts out a burning spill.
12What will happen to the limewater? 9E Acids and metal carbonatesThere’s another way of proving that the gas given off is carbon dioxide.What will happen to the limewater?
13Metal carbonates react with acids. 9E Acids and metal carbonatesMetal carbonates react with acids.metal carbonate + acid salt + water + carbon dioxideThis reaction has helped to shape our landscape. It has formed huge caves out of solid rock, with stalactites and stalagmites.Calcium carbonate (limestone) is insoluble. When it reacts with acidic rainwater, a soluble salt is formed. The rock wears away.Write a word equation for the reaction of calcium carbonate with nitric acid.
14When a metal carbonate reacts with an acid, the atoms are rearranged. 9E What happens to the atoms?When a metal carbonate reacts with an acid, the atoms are rearranged.sodium carbonatenitric acid+Na2CO32HNO3sodium nitratecarbon dioxide+water2NaNO3CO2H2Omagnesium carbonate+sulphuric acidMgCO3H2SO4magnesium sulphate+MgSO4CO2H2Ocarbon dioxidewaterWhere did the carbon dioxide molecules come from? How was the water formed?
159E What, no gas?The reaction between a metal oxide and an acid does not produce a gas. What does it produce?And the answer is… When sulphuric acid reacts with iron oxide it produces iron sulphate and water.CLUE 3 There is no clue 3!CLUE 1 The formula for iron oxide is FeO, and the formula for sulphuric acid is H2SO4.CLUE 2 The salt formed when they react is iron sulphate, formula FeSO4. What else is left over?
16How does copper oxide react with sulphuric acid? 9E Acids and metal oxidesHow does copper oxide react with sulphuric acid?copper oxide + sulphuric acid copper sulphate + water
17When a metal oxide reacts with an acid, the atoms are rearranged. 9E What happens to the atoms?When a metal oxide reacts with an acid, the atoms are rearranged.copper oxide + sulphuric acidCuO H2SO4+copper sulphate waterCuSO H2O+magnesium oxidehydrochloric acidMgO2HCl+waterH2O+MgCl2magnesium chlorideHow was the water formed?Write a general word equation for this reaction.
189E Reactions of metals and metal compounds Salts
19What does the word salt mean to you? 9E Salt with everything?What does the word salt mean to you?Chemists use the word salt to mean...a compound that is made when a metal replaces the hydrogen in an acid.Which acid would you use to make these salts?metal+acidsaltpotassiumpotassium chloridesodiumsodium sulphatecalciumcalcium nitratehydrochloric acidsulphuric acidnitric acid
209E Yet more salts!Lots of different reactions make salts. Here are three examples to complete.metal + acidsalt +?metal oxide + acidsalt +?metal carbonate + acidsalt +?+
21Name as many salts as you can remember (or make up!) in two minutes. 9E Name that saltSalts are very useful chemicals. We use them to flavour our foods, fertilise our crops, and even as antiseptics.Remember that a salt is an acid with its hydrogen replaced by a metal. How many salts can you name?Name as many salts as you can remember (or make up!) in two minutes.
22These are just some of the salts you might have named... 9E How many did you get?These are just some of the salts you might have named...the chlorides (potassium chloride, sodium chloride…)the nitrates (lead nitrate, zinc nitrate…)the sulphates (magnesium sulphate, calcium sulphate…)Check your score!under 5don’t give up the day job!5–10not bad11–15good16–20very good20+wow! you’re super salty!
23Which formula belongs with which salt? 9E Names and formulaeWhich formula belongs with which salt?CuCl2 AlCl3 KNO3NaCl ZnSO4potassium chloridealuminium chloridezinc sulphatecopper chloridesodium chlorideNaClKNO3AlCl3ZnSO4CuCl2
241. Which of these are all metals? a) graphite, copper and lead 9E Quiz1. Which of these are all metals?a) graphite, copper and leadb) magnesium, calcium and marblec) copper, magnesium and iron.2. Which gas is given off when a metal carbonate reacts with an acid?a) carbon dioxideb) hydrogenc) none.
253. Which gas is given off when a metal oxide reacts with an acid? 9E Quiz3. Which gas is given off when a metal oxide reacts with an acid?a) carbon dioxideb) hydrogenc) none.4. Which gas is given off when a metal reacts with an acid?a) carbon dioxideb) hydrogenc) none.