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An element reacts with oxygen to form oxide.an aqueous solution turns red litmus blue.is the element a metal or non-metal?give reason for your reason
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We know basic substance turns red litmus blue and since a solution turns red litmus blue it is basic.since basic oxides are formed by metal so given element is metal
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Why is iron not deposited over a copper plate when the copper plate is dipped in iron sulphate solution
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Since copper being less reactive than iron so it is not able to displace the iron from iron sulphate and thus no deposition takes place
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Consider the reaction:
copper sulphate + iron-iron sulphate+copper iron sulphate + zinc-zinc sulphate+iron on these basis which is the most reactive metal and which is the least reactive metal out of copper,zinc,iron |
In firse equation iron displaces copper so iron is more reactive
in second equation zinc displaces iron so zinc is more reactive than copper thus zinc is most reactive and copper is least reactive |
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Saloni took a piece of burning charcoal and collected the gas evolved in a test tube
a. how will she find the nature of the gas b. write down the word equation of all the reactions taking place in this process |
When charcoal is burnt it forms carbon dioxide .dissolve the gas in the water and dip red litmus and blue litmus paper.we will see it turns blue litmus red.showing carbon dioxide is acidic in nature
b. carbon +oxygen-carbon dioxide carbon dioxide +water-carbonic acid |
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What are metal?name 5 metals
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The elements which are malleableand ductile and which are good conductors of heat and electricity are called metals
iron,magnesium,potassium,copper,zinc |
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What are non metals?name 5 non metals
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The elements which are neither malleable nor ductile ,they are brittle are called non metals
C,S,I,Br,Cl, |
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What are metalloids?name two metalloids
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The elements whose properties are between metals and non metals are called metalloids
silicon,arsenic |
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Classify the following elements into metals,non metals and metalloids
Cu S Al O Si N Ge Hg Cl Na |
Metal-Cu,Al,Hg,Na
non metal-S,O,N,Cl metalloid-Si,Ge |
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What happens when sulphur dioxide is dissolved in water?write a word equation
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It forms sulphurous acid which turns blue litmus red showing that it is an acid
sulphur dioxide +water-sulphurous acid |
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What happens when an iron nail is placed in copper sulphate solution?write a word equation of the reactions involved
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The blue colour solution of copper sulphate fades and a red brown coating of copper metal is deposited on the iron strip.in this reaction copper being less reactive than copper is being displaced by iron.
copper sulphate + iron-iron sulphate + copper |
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State five characteristics of metals and five of non metals
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METALS
1)they are malleable 2)they are ductile 3)they are good conductor of heat and electricity 4)they are lustrous 5)they are hard NON METALS 1)they are brittle 2)they are neither malleable nor ductile 3)they are not good conductor of heat and electricity 4)they are dull 5)they are not strong |
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State 5 uses of metals and 5 uses of non metals
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METALS:
1)they are used in making cooking utensils 2)copper metal is used for making electric wires 3)aluminium metals are used for making aeroplanes 4)silver and gold used for making jewellary 5)mercury is used in thermometers NON METALS 1)oxygen is used in the process of burning 2)nitrogen is used in making fertilisers 3)chlorine is used for purification of water 4)iodine is used as an antiseptic 5)sulphur is used in fireworks |
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Compare the chemical properties of metals and non metals
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metals
Non metals
They form basic oxides
They form acidic oxides
They react with water to form hydrogen gas(except,Cu,Au,Ag)
They donot react with water
They react with dilute acid to form hydrogen gas(except Cu,Au,Ag)
They donot react with dilute acids
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What is the reactionm of metals and non metals with acids and bases?give equation to support to your answer
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Acids:most of the metals recat with dilute acids to form salt and hydrogen gas
eg: Mg + HCl --> MgCl2 + H2 base: some of the metals react with bases to form salt and hydrogen Al + NaOH----> NaAlO2 + H2O |
