WorksheetsChemistry paper 1 H
Total questions: 20
Worksheet time: 1hrs 2mins
How do you calculate the number of moles of a substance?
mass (g) x relative mass
relative mass ÷ mass (g)
mass (g) ÷ relative mass
relative mass + mass (g)
What takes place at the cathode?
Reduction - the loss of electrons
Reduction - the gain of electrons
Oxidation - the loss of electrons
Oxidation - the gain of electrons
In the electrolysis of molten sodium fluoride what ions are formed and which electrode do they migrate to?
Only Na+ and F- ions produced. Na+ migrates to the anode. F- ions migrate to the cathode
Only Na+ and F- ions produced. Na+ migrates to the cathode. F- ions migrate to the anode
Na+, H+ OH- and F- ions produced. Positive ions migrate to the anode, negative to cathode
Na+, H+ OH- and F- ions produced. Positive ions migrate to the cathode, negative to anode
What is the ionic equation for neutralisation?
H- + OH+ → H2O
2H2 + O2 → 2H2O
H+ + OH- → H2O
H+ + OH- → H2O+
In the electrolysis of copper chloride solution what ions are formed and which electrode do they migrate to?
Cu2+, Cl-, H+ and OH- are formed. Cu2+ and H+ migrate to the anode, Cl- and OH- migrate to the cathode
Only Cu2+ and Cl-are formed. Cu2+ migrates to the anode, Cl- migrates to the cathode
Only Cu2+ and Cl-are formed. Cu2+ migrates to the cathode, Cl- migrates to the anode
Cu2+, Cl-, H+ and OH- are formed. Cu2+ and H+ migrate to the cathode, Cl- and OH- migrate to the anode
Which half equation is correct for the reaction at the cathode during the electrolysis of lead bromide?
2Br- + 2e → Br2
Pb2+ - 2e → Pb
Pb2+ + 2e → Pb
2Br- - 2e → Br2
Calculate the number of sulfur dioxide molecules in 48.0 g, SO2
(relative atomic masses: O = 16.0, S = 32.0; Avogadro constant = 6.02 × 1023 mol–1)
Give your answer in standard form and to three significant figures.
Use a star symbol for standard form e.g. 6.02 x 10*23
(a)
What are strong acids?
Acids that completely dissociate into ions in solution. (Releasing H+ ions)
Acids that partially dissociate into ions in solution. (Releasing H+ ions)
Acids that completely dissociate into ions in solution. (Releasing OH- ions)
Acids that completely dissociate into ions in solution. (Releasing OH- ions)
Which of the following statements are true for NaCl?
It is an ionic compound, and the electrons are transferred forming ions.
It is an covalent compound, and the electrons are shared forming ions.
It has a high melting point as the electrostatic forces are strong requiring a lot of energy to overcome them.
It can only conduct electricity when solid as the ions cannot flow.
CO2 is a simple covalent compound, which of the following properties are true?
CO2 has a low melting point as the strong covalent bonds are broken.
CO2 has a low melting point as the weak intermolecular forces between molecules are broken.
CO2 can conduct electricity because there electrons that are free to move.
CO2 cannot conduct electricity because none of the electrons are free to move.
Can ionic compounds conduct electricity?
Yes all ionic compounds can conduct electricity because they contain ions
No ionic compounds cannot conduct electricity
Only solid ionic compounds can conduct electricity because ions cannot move
Only molten or aqueous ionic compounds can conduct electricity because ions can move
Which is true for ionic compounds?
Ionic compounds have high melting points because ionic bonds are strong bonds
Ionic compounds have low melting points because ionic bonds are strong bonds
Ionic compounds have high melting points because ionic bonds are weak bonds
Ionic compounds have low melting points because ionic bonds are weak bonds
Why can graphite be used as a lubricant?
Graphite is slippery as the layers are held together with weak intermolecular forces that can slide off each other
Graphite is slippery as the layers are held together with strong covalent bonds that can slide off each other
Because graphite is a giant covalent compound
Graphite cannot be used as a lubricant because it is not slippery
Which one best describes the bonding in metals
Consists of a giant lattice of positive ions with weak attractive forces holding them together
Positive and negative ions are formed which are attracted to each other
Metal atoms share their electrons with each other holding them together
Consists of a giant lattice of positive ions with a sea of delocalised electrons
A substance that consists of a metal and non-metal, has a high melting point and can conduct electricity when its molten has been identified. What type of substance is this?
Simple covalent
Giant covalent
Ionic
Metallic
An acid has a pH of 3, it is diluted by a factor of 100. What is the new pH?
1
2
4
5
Which of the following is true of an acid?
They dissociate to release H+ ions
They dissociate to release OH- ions
The pH of their solutions is greater than 7
The pH of their solutions is less than 7
What are the TWO limitations of the ball and stick model?
The model does not show the molecules 3 dimensional shape
It does not show the bonding and non-bonding electrons
It doesn't show how each atom is bonded to other atoms
It doesn't show the elements chemical symbol
What is the limitation of the dot and cross diagram?
It doesn't show the bonding and non-bonding electrons
It doesn't show the elements chemical symbol
It doesn't show the 3 dimensional shape
It doesn't show how each atom is bonded to other atoms
Which of the following explains why metals are malleable
Metals have rigid lattices and strong bonds so they don't shatter
Metals consist of layers of positive ions which can slide over each other and the electrons hold them together
Metals have layers which are held together by weak intermolecular forces that can slide off each other
Metals consist of layers of negative ions which can slide over each other and the electrons hold them together
