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© OUP: To be used solely in purchasers school or college 9E Reactions of metals and metal compounds Useful metals Metals and metal compounds 9E Reactions.

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Presentation on theme: "© OUP: To be used solely in purchasers school or college 9E Reactions of metals and metal compounds Useful metals Metals and metal compounds 9E Reactions."— Presentation transcript:

1 © OUP: To be used solely in purchasers school or college 9E Reactions of metals and metal compounds Useful metals Metals and metal compounds 9E Reactions of metals and metal compounds Salts

2 © OUP: To be used solely in purchasers school or college 9E Reactions of metals and metal compounds Useful metals

3 © OUP: To be used solely in purchasers school or college We use metals for bridges and cars, for jewellery, and even inside our bodies. What s so special about metals? 9E Properties of metals Complete the table. Answer yes or no. Give three more properties of metals. propertytypical of metals? good conductor of heat poor conductor of electricity shiny surface can be beaten into flat sheets does not react with oxygen gas at room temperature yes no yes no

4 © OUP: To be used solely in purchasers school or college 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 joints 2 copper in electrical circuits 3 gold for jewellery 4 lead for weights property of metal A has a high density B shiny and unreactive, so it does not tarnish C very light and strong, and unreactive D cheap and a good conductor of electricity property of metal C very light and strong, and unreactive D cheap and a good conductor of electricity B shiny and unreactive, so it does not tarnish A has a high density

5 © OUP: To be used solely in purchasers school or college Read all about it! 9E Odd ones out 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?

6 © OUP: To be used solely in purchasers school or college Metals and metal compounds 9E Reactions of metals and metal compounds

7 © OUP: To be used solely in purchasers school or college 9E Ill name that gas in... Many metals react with acids to produce a gas. But which gas is it? CLUE 1 Think about the formulae for acids: sulphuric acid H 2 SO 4, hydrochloric acid HCl, nitric acid HNO 3. CLUE 2 The gas burns with a popping sound. CLUE 3 The gas is not oxygen. And the gas is... Hydrogen!

8 © OUP: To be used solely in purchasers school or college How do metals react with acids? Complete this equation. 9E Metals and acids metal + hydrochloric acid ?? + Write a word equation for each metal with hydrochloric acid: What evidence would tell you this reaction has occurred? calcium magnesium zincironleadcoppersilver

9 © OUP: To be used solely in purchasers school or college 9E More metals, more acids Metals react with acids to produce a salt and hydrogen. Which salts would be made here? Write a word equation for the reaction of magnesium with nitric acid. metalsalt produced in hydrochloric acid salt produced in sulphuric acid magnesium zinc iron magnesium chloride zinc chloride iron chloride magnesium sulphate zinc sulphate iron sulphate

10 © OUP: To be used solely in purchasers school or college 9E What happens to the atoms? In any chemical reaction the atoms are rearranged. Metals react with acids like this. Hydrogen bubbles appear because hydrogen atoms leave the acid and pair up to form hydrogen molecules. zinc + sulphuric acid Zn + H 2 SO 4 + zinc sulphate + hydrogen ZnSO 4 + H 2 + zinc + hydrochloric acid Zn + 2HCl + zinc chloride + hydrogen ZnCl 2 + H 2 +

11 © OUP: To be used solely in purchasers school or college 9E Ill name that gas in... Metal carbonates react with acids to produce a gas. But which gas is it? CLUE 1 The formulae for carbonates: sodium carbonate Na 2 CO 3, copper carbonate CuCO 3, zinc carbonate ZnCO 3. CLUE 2 The gas puts out a burning spill. CLUE 3 The gas is not hydrogen. And the gas is... Carbon dioxide!

12 © OUP: To be used solely in purchasers school or college 9E Acids and metal carbonates Theres another way of proving that the gas given off is carbon dioxide. What will happen to the limewater?

13 © OUP: To be used solely in purchasers school or college Metal carbonates react with acids. 9E Acids and metal carbonates metal carbonate + acidsalt + water + carbon dioxide This 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.

14 © OUP: To be used solely in purchasers school or college 9E What happens to the atoms? When a metal carbonate reacts with an acid, the atoms are rearranged. Where did the carbon dioxide molecules come from? How was the water formed? magnesium carbonate +sulphuric acid + + MgCO 3 H 2 SO 4 magnesium sulphate + + +MgSO 4 CO 2 H2OH2O+ + carbon dioxide water + sodium carbonate nitric acid + +Na 2 CO 3 2HNO 3 + sodium nitrate carbon dioxide water 2NaNO 3 CO 2 H2OH2O

15 © OUP: To be used solely in purchasers school or college 9E What, no gas? The reaction between a metal oxide and an acid does not produce a gas. What does it produce? CLUE 1 The formula for iron oxide is FeO, and the formula for sulphuric acid is H 2 SO 4. CLUE 2 The salt formed when they react is iron sulphate, formula FeSO 4. What else is left over? CLUE 3 There is no clue 3! And the answer is… When sulphuric acid reacts with iron oxide it produces iron sulphate and water.

16 © OUP: To be used solely in purchasers school or college 9E Acids and metal oxides How does copper oxide react with sulphuric acid? copper oxide + sulphuric acid copper sulphate + water

17 © OUP: To be used solely in purchasers school or college 9E What happens to the atoms? When a metal oxide reacts with an acid, the atoms are rearranged. Write a general word equation for this reaction. copper sulphate + water CuSO 4 + H 2 O + copper oxide + sulphuric acid CuO + H 2 SO 4 + water H2OH2O MgCl 2 magnesium chloride magnesium oxide hydrochloric acid MgO2HCl How was the water formed?

18 © OUP: To be used solely in purchasers school or college Salts 9E Reactions of metals and metal compounds

19 © OUP: To be used solely in purchasers school or college What does the word salt mean to you? 9E Salt with everything? 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+acidsalt potassiumpotassium chloride sodiumsodium sulphate calciumcalcium nitrate hydrochloric acid sulphuric acid nitric acid

20 © OUP: To be used solely in purchasers school or college Lots of different reactions make salts. Here are three examples to complete. 9E Yet more salts! metal + acidsalt+ ? metal oxide + acidsalt+ ? metal carbonate + acidsalt+ ? + ?

21 © OUP: To be used solely in purchasers school or college 9E Name that salt 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. Salts are very useful chemicals. We use them to flavour our foods, fertilise our crops, and even as antiseptics.

22 © OUP: To be used solely in purchasers school or college 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 bad 11 – 15good 16 – 20very good 20+wow! you re super salty!

23 © OUP: To be used solely in purchasers school or college Which formula belongs with which salt? 9E Names and formulae CuCl 2 AlCl 3 KNO 3 NaClZnSO 4 KNO 3 NaCl potassium chloride aluminium chloride zinc sulphate copper chloride sodium chloride AlCl 3 ZnSO 4 CuCl 2

24 © OUP: To be used solely in purchasers school or college 1. Which of these are all metals? a) graphite, copper and lead b) magnesium, calcium and marble c) copper, magnesium and iron. 2. Which gas is given off when a metal carbonate reacts with an acid? a) carbon dioxide b) hydrogen c) none. 9E Quiz

25 © OUP: To be used solely in purchasers school or college 3. Which gas is given off when a metal oxide reacts with an acid? a) carbon dioxide b) hydrogen c) none. 4. Which gas is given off when a metal reacts with an acid? a) carbon dioxide b) hydrogen c) none. 9E Quiz


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