Chemistry C3

HideShow resource information
  • 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.
1 of 30
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,
2 of 30
3.What is the charge on a sulfide ion?
S2-
3 of 30
4.What is the overall charge on an ionic compound?
0
4 of 30
5.What is shown by an ionic equation?
Only the reacting particles (and the products they form) are included
5 of 30
6.What type of chemical equation would you use to show how electrons are transferred in a reaction?
Half equations
6 of 30
7.What is meant by a limiting reactant?
The reactant that's used up in a reaction
7 of 30
8.Give the formula that links concentration, volume of solution and mass of solute.
Mass=concentration divided by volume
8 of 30
9.Give the formula that links concentration, volume of solution and mass of solute.
Mass=concentration divided by volume
9 of 30
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
10 of 30
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
11 of 30
12.Sketch the reaction profile for an exothermic reaction
Exothermic reaction:
12 of 30
13.What is meant by the term 'activation energy'?
The minimum amount of energy needed for bonds to break and a reaction to start
13 of 30
14.Is energy released when bonds are broken or when they're made?
When bonds are made
14 of 30
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
15 of 30
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
16 of 30
17.Name two ways that you could measure the pH of a solution.
Universal indicator, pH probe attached to a pH meter
17 of 30
18.What are the reactants and products of a neutralisation reaction?
Reactants=acid and base Products=salt and water
18 of 30
19.Sketch a titration curve to show how the pH of a solution of acid changes as a base is added.
Titration graph
19 of 30
20.Write an equation to show the ionisation of ethanoic acid, a weak acid, in solution.
Equation with ethanoic acid:
20 of 30
21.Write a balance equation for the reaction of hydrochloric acid with aluminium.
Hydrochloric acid with aluminium=
21 of 30
22.Write a balanced equation to show how copper chloride is made from copper oxide and hydrochloric acid.
Copper oxide+hydrochloric acid>copper chloride
22 of 30
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)
23 of 30
24.Give the two definitions of a(oxidation b)reduction
a)loss of electrons b)gain of electrons
24 of 30
25.What is electrolysis?
The breaking down of a substance using electricity
25 of 30
26.When a molten ionic compound decomposes during electrolysis, at which electrode does the metal form?
Cathode
26 of 30
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
27 of 30
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
28 of 30
29.What is the test for carbon dioxide gas?
Limewater test- if it goes cloudy carbon dioxide is present
29 of 30
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
30 of 30

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

Preview of the front of card 3

Card 4

Front

4.What is the overall charge on an ionic compound?

Back

Preview of the front of card 4

Card 5

Front

5.What is shown by an ionic equation?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Acids, bases and salts resources »