Chemistry C3
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- Created by: Amy_5639
- Created on: 05-04-18 21:02
1.In a reaction, how does the mass of products compare with the mass of reactants?
In a reaction the total mass of reactants always equal the total mass of products.
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2.Why might the mass of a reaction that occurs in an open vessel appear to decrease or increase?
liquids or aqueous and at least one of the products is a gas.Increase in mass=at least one of the reactants is a gas that's found in air.Decrease in mass=some or all of the reactants are solids,
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3.What is the charge on a sulfide ion?
S2-
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4.What is the overall charge on an ionic compound?
0
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5.What is shown by an ionic equation?
Only the reacting particles (and the products they form) are included
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6.What type of chemical equation would you use to show how electrons are transferred in a reaction?
Half equations
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7.What is meant by a limiting reactant?
The reactant that's used up in a reaction
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8.Give the formula that links concentration, volume of solution and mass of solute.
Mass=concentration divided by volume
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9.Give the formula that links concentration, volume of solution and mass of solute.
Mass=concentration divided by volume
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10.What does Avogadro's constant represent?
The constant, 6.022x10tothe23, representing the number of atoms, molecules, or ions in one mole of a substance
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11.What is the difference between an endothermic and exothermic reaction?
Exothermic=gives out energy to the surroundings, usually in the form of heat and by a rise of temperature Endothermic= takes in energy from the surroundings, usually in the form of heat and by a fall in temperature
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12.Sketch the reaction profile for an exothermic reaction
Exothermic reaction:
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13.What is meant by the term 'activation energy'?
The minimum amount of energy needed for bonds to break and a reaction to start
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14.Is energy released when bonds are broken or when they're made?
When bonds are made
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15.How would you calculate the overall energy change in a reaction from the bond energies?
Overall energy change= energy required to break bonds-energy released by forming bonds
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16.What is: a)an acid b)abase c)an alkali
a)a substance with a pH less than 7. Acids form H+ ions in water. b)a substance with a pH more than 7. c)a base that dissolves in water. Alkalis form OH- ions in water
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17.Name two ways that you could measure the pH of a solution.
Universal indicator, pH probe attached to a pH meter
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18.What are the reactants and products of a neutralisation reaction?
Reactants=acid and base Products=salt and water
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19.Sketch a titration curve to show how the pH of a solution of acid changes as a base is added.
Titration graph
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20.Write an equation to show the ionisation of ethanoic acid, a weak acid, in solution.
Equation with ethanoic acid:
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21.Write a balance equation for the reaction of hydrochloric acid with aluminium.
Hydrochloric acid with aluminium=
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22.Write a balanced equation to show how copper chloride is made from copper oxide and hydrochloric acid.
Copper oxide+hydrochloric acid>copper chloride
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23.Outline how you could make lead chloride using a precipitation reaction.
To make lead chloride(insoluble), mix lead nitrate and sodium chloride(both soluble)
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24.Give the two definitions of a(oxidation b)reduction
a)loss of electrons b)gain of electrons
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25.What is electrolysis?
The breaking down of a substance using electricity
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26.When a molten ionic compound decomposes during electrolysis, at which electrode does the metal form?
Cathode
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27.Outline how you would set up an electrochemical cell using copper sulfate solution and inert electrodes.
Get two copper electrodes and clean them with emery paper. Place electrodes in the beaker filled with your electrolectrolyte. Connect the electrodes to a power supply using crocodile clips and wires
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28.Why do masses of non-inert electrodes change during electrolysis?
The mass of the anode will decrease and the mass of the cathode will increase because copper is transferred from the anode to the cathode
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29.What is the test for carbon dioxide gas?
Limewater test- if it goes cloudy carbon dioxide is present
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30.If you were testing a gas to see if it was chlorine, describe what a positive result would look like.
If the gas is chlorine, it will bleach the litmus paper turning it white
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Other cards in this set
Card 2
Front
2.Why might the mass of a reaction that occurs in an open vessel appear to decrease or increase?
Back
liquids or aqueous and at least one of the products is a gas.Increase in mass=at least one of the reactants is a gas that's found in air.Decrease in mass=some or all of the reactants are solids,
Card 3
Front
3.What is the charge on a sulfide ion?
Back
Card 4
Front
4.What is the overall charge on an ionic compound?
Back
Card 5
Front
5.What is shown by an ionic equation?
Back
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