Metals Nat 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37.

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Presentation transcript:

Metals Nat 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Name a metal found un combined in the Earth’s crust. Gold, silver or copper.

Give a property of metals. Ductile Strong Malleable Conducts heat Conducts electricity

Which metal is extracted from it’s ore in a Blast Furnace? IRON

What is produced when metal reacts with oxygen? Metal oxide

Name a metal obtained from its ore by electrolysis? Mg, Al, Na, K, Li

Name the products of the reaction between zinc and sulphuric acid. Zinc Sulphate + Hydrogen

Name the products of the reaction between sodium and water. Sodium Hydroxide + Hydrogen

What is an alloy? Mix of difference metals or a mix of metals and non metals.

Which type of reaction takes place when a metal is extracted from its compound (ore)? Reduction

Identify the two alloys from the list: brass, iron, copper and steel. Brass and Steel .

Calculate the percentage mass of potassium in potassium sulphide. gfm K = 39 G Gfm K2S = 2 x 39 + 32 = 110 % mass= (39/ 110) x 100 = 35.5 %

Name a metal which does NOT react with dilute acid Gold, silver or copper.

What is the name of group 1 metals? Alkali Metals .

What is a displacement reaction ? A metal high in the electrochemical series displaces ( takes its place) ions of a metal lower in the series from it solution.

Is this ion electron equation an example of reduction or oxidation? Cu 2+ + 2e- Cu Reduction.

Is this ion electron equation an example of reduction or oxidation? 2Cl - Cl2 + 2e- Oxidation

Electricity is the flow of ? Electrons .

Why do batteries run out? The chemicals get used up.

State an advantage of batteries over mains electricity Batteries are portable.

What is the purpose of the ion (salt) bridge? To complete the circuit.

What is the relationship between the position of metals in the electrochemical series and the voltage of a cell? The further away they are from each other the larger the voltage.

What is the purpose of an electrolyte? To complete the circuit.

What directions will the electrons flow in a zinc / copper cell? Zinc to Copper.

What is oxidation? Loss of electrons.

What is reduction? Gain of electrons.

Name the type of chemical reaction taking place. Mg + CuCl2 Cu + MgCl2 Displacement.

What is corrosion? A chemical reaction involving metals changing from element to a compound.

What are the two conditions required for rusting to take place? Water and oxygen.

What type of reaction takes place when a metal corrodes? Oxidation

How can you test to see if Iron has corroded? Will change from an element to an ion, Fe 2+ and Fe 2+ can be detected as it turns Ferroxyl indicator blue.

Which terminal of a battery protects iron from rusting? Negative

Why does salt speed up corrosion? As salt is an electrolyte.

How does a physical barrier protect iron against rusting? Prevents water and oxygen ( air).

What metal is used to galvanise Iron? Zinc

Why does scratched tin plated iron rust faster then non –plated iron? Electrons flow from Iron to Tin because Tin is below Iron in the electrochemical series.

Magnesium provides Iron with sacrificial protection Magnesium provides Iron with sacrificial protection. In which direction do electrons flow? From Magnesium to Iron.

Give examples how Iron can be physically protected? Layer of Paint Layer of Grease Layer of plastic Tin plating Electroplating Galvanising