OCR Combined Science A Papers 3 and 9 Automock

#1. Why are metals malleable?

Because metal atoms themselves are compressible and are moulded into shape

Because metal ions constantly break and reform their bonds, allowing the shape to be moulded

Because the layers of metal slide across each other, rather than breaking the bonds between ions

#2. Are non-metals usually good conductors of electricity?

Yes

No

#3. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?

Alpha particles

Electrons

Neutrons

Protons

#4. Which of these is the mobile phase in paper chromatography?

the solvent

the ink

the paper

#5. Which of these are common properties of giant covalent materials?

Conduct electricity

Do not conduct electricity

Low melting/boiling points

Soluble in water

Insoluble in water

High melting/boiling points

#6. What is the formula for nitric acid?

Ca(OH)₂

HCL

H₂SO₄

NaOH

KOH

HNO₃

#7. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question

2,7

2,5

2,8,5

#8. What is the chemical symbol for helium?

#9. What is the name of the phase change from solid to liquid?

sublimation

deposition

freezing

melting

condensation

evaporation/boiling

#10. Are metals usually good conductors of electricity?

No

Yes

#11. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

Cathode: Hydrogen (H₂) Anode: Hydroxide (OH⁻)

Cathode: Sodium (Na) Anode: Hydroxide (OH⁻)

Cathode: Hydrogen (H₂) Anode: Sulfate (SO₄²⁻)

#12. What is the freezing point of water?

66.5˚C

0˚C

55˚C

25˚C

100˚C

30˚C

#13. What are giant covalent structures?

Ionically bonded substances such as sodium bromide

a compound which contains atoms covalently bonded together, but with weak intermolecular forces between molecules

a structure where each atom has a covalent bond to its neighbour

#14. Do metals usually have a high or low melting point?

Low

High

#15. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.

#16. What method can we use to separate multiple types of liquids?

#17. What is the name of the force that holds together ions in ionic compounds?

electrostatic force

strong nuclear force

gravity

weak nuclear force

#18. Can compounds be pure, for example, carbon dioxide?

no

yes

#19. Which of the following descriptions matches the Mᵣ of a compound?

The sum of the relative atomic masses of all of the atoms or ions in its formula

The simplest whole number ratio of atoms

The mean mass of an atom compared with carbon-12

#20. Which three particles are atoms composed of?

#21. What is the name of the phase change from solid to gas?

condensation

freezing

sublimation

melting

evaporation/boiling

deposition

#22. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?

Endothermic

Exothermic

#23. Which type of reaction is photosynthesis?

Exothermic

Ectothermic

Endothermic

#24. Complete the equation: HCl (aq) + KOH(s) → ….. + …..

Select all that apply:

ClOH

O

KCl

H₂O

H₂

#25. Complete the equation: H₂SO₄(aq) + ZnO(s) → …. + ….

Select all that apply:

ZnSO₄ (aq)

H₂SO₄ (l)

H₂SO₄ (aq)

H₂O (l)

HZnO₄ (s)

#26. What is the formula for sodium hydroxide?

KOH

HCL

NaOH

Ca(OH)₂

HNO₃

H₂SO₄

#27. Complete the following half equation for a reaction the cathode during electrolysis of molten zinc chloride. Zn²⁺ + ….. → Zn

2e

Zn

ZnO

e

#28. What is the charge of a neutron?

+1

0

-1

#29. What are positive ions called?

cations

anions

#30. Are gases fluids?

No

Yes

#31. Why do both graphite and diamond have high melting points?

Many strong covalent bonds need to be broken in order to melt the solid forms of diamond and graphite.

All materials made of carbon have a high melting point, that is why carbon is added to iron to make steel.

#32. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the cathode. Cu²⁺ + 2e →

Cu

SO₄²⁻

CuO

#33. During a neutralisation reaction which salt is formed from sulfuric acid?

Carbonate

Sulfate

Nitrate

Chloride

Borate

#34. What is the relative mass of a proton?

1/1840

1

2

#35. What is the difference in concentration between pH 6 and pH 4?

1x

1000x

10x

100x

10,000x

#36. What is the formula for the polyatomic ion sulfate?

CO₃²⁻

OH⁻

SO₄²⁻

SO₃²⁻

NO₃⁻

NH₄⁺

#37. What is the chemical symbol for iron?

#38. Are metals usually shiny or dull in colour?

dull

shiny

#39. In aqueous solutions such as sodium chloride solution, there will be negatively charged ions from the salt (Cl⁻) as well as hydroxide ions (OH⁻). What is the rule that determines which will be discharged at the anode.

Always the other ions and never the hydroxide

Always the hydroxide regardless of the other ions

Always the hydroxide, unless a halide (group 7) is present.

#40. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?

Most of the atoms were deflected or bounced back

Most of the atoms passed straight through the foil

Most of the particles were destroyed when they met protons in the nucleus

#41. What are ions?

atoms which have gained or lost electrons

atoms which have different numbers of neutrons

atoms which have different numbers of protons

#42. Acids produce an excess of what when they dissolve in water?

sulfate ions

hydroxide ions

carbonate ions

hydrogen ions

#43. What is the chemical symbol for carbon?

#44. What is the chemical symbol for sulfur?

#45. What is the name of the process by which salt is removed from water?

desalination

unsaturation

demicronation

#46. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

H₂O (l)

NaOH

2H₂O (l)

MgOH

Na₂SO₄(aq)

#47. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

More soluble - shorter distance

More soluble - greater distance

#48. Which process can be used to separate water from dissolved salts, whilst keeping both substances?

#49. When using inert electrodes to perform electrolysis with water acidified with sulfuric acid, which products will be produced at the anode and cathode?

Cathode: Hydroxide (OH⁻) Anode: Hydrogen (H₂)

Cathode: Hydrogen (H₂) Anode: Sulfate (SO₄²⁻)

Cathode: Hydrogen (H₂) Anode: Hydroxide (OH⁻)

#50. What state of matter has particles which are close together and move around each other?

liquids

gases

solids

#51. What is the name of the phase change from gas to liquid?

condensation

sublimation

deposition

melting

evaporation/boiling

freezing

#52. Which of the following things were hypothesised by John Dalton in 1805? ? select 4 answers

Select all that apply:

atoms are hard cubes that can be broken down into protons, neutrons and electrons

atoms cannot be broken down into smaller parts

all matter is made up of tiny spheres called atoms

atoms cannot be created or destroyed

atoms in elements are identical, but elements have different types of atoms

atoms can be created and destroyed

#53. Can Rf values be higher than 1?

No

Under certain conditions

Yes

#54. Are non-metals usually malleable or brittle?

Brittle

Malleable

#55. Which of the following are uses for paper chromatography?

Select all that apply:

distinguishing between pure and impure substances

separating insoluble solids

identifying substances by calculating Rf values

determining the boiling point of a substance

identifying substances by comparing chromatogram patterns to patterns formed by known substances

#56. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

beta particles

alpha particles

gamma rays

#57. What is the symbol for relative atomic mass?

Aᵣ

Gᵣ

AMᵣ

Mᵣ

#58. What is the chemical symbol for magnesium?

#59. How could you separate a mixture of sand and salt?

use paper chromatography to separate the sand from the salt

fill a container with water to dissolve the salt, then filter out the sand and evaporate the water

add water and then use fractional distillation to separate the sand and water and you will be left with the salt

#60. What is graphene?

Graphene is a layer of graphite that is one atom thick

Graphene is the material that forms from the covalent bonding of oxygen and nitrogen

Graphene is a small section of a diamond

GCSE OCR Combined Science A Papers 3 and 9

Results

#1. Why are metals malleable?

#2. Are non-metals usually good conductors of electricity?

#3. In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?

#4. Which of these is the mobile phase in paper chromatography?

#5. Which of these are common properties of giant covalent materials?

#6. What is the formula for nitric acid?

#7. What is the electronic configuration of a nitrogen atom? ? you might need a periodic table to answer this question

#8. What is the chemical symbol for helium?

#9. What is the name of the phase change from solid to liquid?

#10. Are metals usually good conductors of electricity?

#11. When using inert electrodes to perform electrolysis with sodium sulfate solution, which products will be produced at the anode and cathode?

#12. What is the freezing point of water?

#13. What are giant covalent structures?

#14. Do metals usually have a high or low melting point?

#15. Lead has 4 stable isotopes. ²⁰⁴Pb (abundance – 1.4%), ²⁰⁵Pb (abundance – 24.1%), ²⁰⁷Pb (abundance – 22.1%) and ²⁰⁸Pb (abundance – 52.4%). Calculate the Aᵣ of lead. Answer to 2 decimal places.

#16. What method can we use to separate multiple types of liquids?

#17. What is the name of the force that holds together ions in ionic compounds?

#18. Can compounds be pure, for example, carbon dioxide?

#19. Which of the following descriptions matches the Mᵣ of a compound?

#20. Which three particles are atoms composed of?

#21. What is the name of the phase change from solid to gas?

#22. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?

#23. Which type of reaction is photosynthesis?

#24. Complete the equation: HCl (aq) + KOH(s) → ….. + …..

#25. Complete the equation: H₂SO₄(aq) + ZnO(s) → …. + ….

#26. What is the formula for sodium hydroxide?

#27. Complete the following half equation for a reaction the cathode during electrolysis of molten zinc chloride. Zn²⁺ + ….. → Zn

#28. What is the charge of a neutron?

#29. What are positive ions called?

#30. Are gases fluids?

#31. Why do both graphite and diamond have high melting points?

#32. Copper can be purified using electrolysis of copper sulfate solution. For this process we use the setup in the image below. Complete the half equation for the reaction at the cathode. Cu²⁺ + 2e →

#33. During a neutralisation reaction which salt is formed from sulfuric acid?

#34. What is the relative mass of a proton?

#35. What is the difference in concentration between pH 6 and pH 4?

#36. What is the formula for the polyatomic ion sulfate?

#37. What is the chemical symbol for iron?

#38. Are metals usually shiny or dull in colour?

#39. In aqueous solutions such as sodium chloride solution, there will be negatively charged ions from the salt (Cl⁻) as well as hydroxide ions (OH⁻). What is the rule that determines which will be discharged at the anode.

#40. Why did Ernest Rutherford’s experiments with gold foil demonstrate that most of atoms consists of empty space?

#41. What are ions?

#42. Acids produce an excess of what when they dissolve in water?

#43. What is the chemical symbol for carbon?

#44. What is the chemical symbol for sulfur?

#45. What is the name of the process by which salt is removed from water?

#46. H₂SO₄(aq) + Na₂O(s) → …. + ….

#47. The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

#48. Which process can be used to separate water from dissolved salts, whilst keeping both substances?

#49. When using inert electrodes to perform electrolysis with water acidified with sulfuric acid, which products will be produced at the anode and cathode?

#50. What state of matter has particles which are close together and move around each other?

#51. What is the name of the phase change from gas to liquid?

#52. Which of the following things were hypothesised by John Dalton in 1805? ? select 4 answers

#53. Can Rf values be higher than 1?

#54. Are non-metals usually malleable or brittle?

#55. Which of the following are uses for paper chromatography?

#56. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

#57. What is the symbol for relative atomic mass?

#58. What is the chemical symbol for magnesium?

#59. How could you separate a mixture of sand and salt?

#60. What is graphene?

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