OCR Combined Science A Papers 3 and 9 Automock

#1. Which of the following items would you need to perform crystallisation by heating? ? 6 items

Select all that apply:

a beaker

gauze

filter funnel

an evaporating basin

a heatproof mat

a bunsen burner

filter paper

tripod

#2. Which of the following was the Rutherford Model of atomic structure?

A central nucleus containing protons and neutrons, surrounded by electrons

A mass of positively charged material with negatively charged electrons distributed throughout it

#3. Solutions of less than pH 7 are?

acidic

alkaline

neutral

#4. Are gases fluids?

Yes

No

#5. What the the most dense state of matter?

liquids

solids

plasma

gases

#6. Which of these best describes metallic bonding?

Metal atoms lose their electrons to a delocalised pool and all of the metal ions are mutually attracted to the delocalised pool, holding all of the ions together.

Metal atoms lose their electrons to non-metal atoms which then creates positive and negative ions which are attracted by electrostatic attraction.

Metal atoms share their electrons in order to fill their electron shells, this causes an attraction between the positive nuclei and shared electrons.

#7. Alkalis produce an excess of what when they dissolve in water?

hydrogen ions

hydroxide ions

sulfite ions

sulfate ions

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

Select all that apply:

HZnO₄ (s)

ZnSO₄ (aq)

H₂SO₄ (aq)

H₂SO₄ (l)

H₂O (l)

#9. True or false. All atoms of the same element have the same atomic number.

True

False

#10. Which of the following are weak acids?

Select all that apply:

boric acid

ethanoic acid

nitric acid

hydrochloric acid

sulfuric acid

carbonic acid

#11. What is the chemical symbol for oxygen?

#12. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..

Loss, Anode

Loss, Cathode

Gain, Cathode

Gain, Anode

#13. In which type of reaction would the temperature of a solution increase?

Exothermic

Endothermic

Mesothermic

Ectothermic

#14. What is the chemical symbol for copper?

#15. Why are metals malleable?

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

Because metal atoms themselves are compressible and are moulded into shape

#16. Why is diamond hard?

Diamond is hard because it is composed of particular isotopes of carbon with extra neutrons, making the material more dense

Diamond is hard because carbon atom is covalently bonded to 4 other carbon atoms, in a tetrahedral arrangement.

Diamond is hard because it is made of ionically bonded carbon atoms.

#17. What is the chemical symbol for silver?

#18. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?

Thermal

Chemical

Electrical

#19. What is the chemical symbol for sodium?

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

melting

evaporation/boiling

sublimation

freezing

deposition

condensation

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

Borate

Sulfate

Chloride

Nitrate

Carbonate

#22. 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⁻)

#23. What is the chemical symbol for carbon?

#24. Are metals usually good conductors of electricity?

No

Yes

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

melting

freezing

deposition

condensation

sublimation

evaporation/boiling

#26. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

2H₂O (l)

Na₂SO₄(aq)

NaOH

MgOH

H₂O (l)

#27. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?

2

1

3

#28. What are giant covalent structures?

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

Ionically bonded substances such as sodium bromide

#29. What is the boiling temperature of water?

10˚C

55˚C

100˚C

66.5˚C

30˚C

25˚C

#30. Which of these is the stationary phase in paper chromatography?

the ink

the solvent

the paper

#31. During Ernest Rutherford’s experiments with gold foil, why did some of the particles bounce back?

Alpha particles behave in unpredictable ways and can randomly change direction due to quantum effects

Alpha particles are positively charged, they were deflected when they met the positively charged protons in the nucleus

He fired electrons at the gold foil and when they met protons they were reflected back

#32. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

Neither

Cathode

Anode

#33. 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 anode. Cu → ….. + …..

SO₃²⁻ + 2e

Cu²⁺ + 2e

Cu⁺ + e

#34. Which type of reaction takes in energy, making the surroundings cooler?

Ectothermic

Exothermic

Endothermic

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

the ink

the paper

the solvent

#36. What is the chemical symbol for radium?

#37. Are metals usually malleable or brittle?

Brittle

Malleable

#38. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#39. What is the relative mass of an electron?

0 or 1/1840

2

1

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

Alpha particles

Electrons

Neutrons

Protons

#41. Determine the empirical formula for Cyclopentane – C₅H₁₀?

CH₂

2CH

CH₄

C₂H₂

#42. True or false – Precipitation reactions can be either exothermic or endothermic.

True

False

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

NO₃⁻

CO₃²⁻

SO₃²⁻

OH⁻

NH₄⁺

SO₄²⁻

#44. True or false – You cannot use physical processes to separate mixtures into different substances.

False

True

#45. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.

#46. Filtration and crystallisation are used to separate which types of materials?

separate soluble materials from insoluble materials

separate different types of liquids

separating soluble compounds

$fractional distillation diagram$

#47. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?

contains glass rods - is the same temperature throughout - only the desired liquid will reach the condenser

contains glass rods - is hotter at bottom than top - only the desired liquid will reach the condenser

contains glass rods - is hotter at top than bottom - only the desired liquid will reach the condenser

#48. During a neutralisation reaction which salt is formed from nitric acid?

Nitrate

Sulfate

Borate

Chloride

Carbonate

#49. What type of substance is the air?

Select all that apply:

Mixture

Element

Compound

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

demicronation

unsaturation

desalination

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

More soluble - greater distance

More soluble - shorter distance

#52. What is the charge of an electron?

0

+1

-1

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

strong nuclear force

gravity

electrostatic force

weak nuclear force

#54. What is the chemical symbol for iodine?

#55. Do non-metals usually have a high or low melting point?

Low

High

#56. What is the chemical symbol for calcium?

#57. What do we use fullerenes for?

as fuel in high performance internal combustion engines and in electric car batteries

nanoelectronics, delivery of medicines within the body and strengthening tennis racket frames

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

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

Most of the atoms passed straight through the foil

Most of the atoms were deflected or bounced back

#59. What is the approximate radius of a nucleus?

1 x 10⁻³

1 x 10⁻⁴

1 x 10⁻⁵

1 x 10⁻¹⁵

#60. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.

Electrical, Direct

Thermal, Direct

Thermal, Indirect

Electrical, Alternating

GCSE OCR Combined Science A Papers 3 and 9

Good Luck!

Results

#1. Which of the following items would you need to perform crystallisation by heating? ? 6 items

#2. Which of the following was the Rutherford Model of atomic structure?

#3. Solutions of less than pH 7 are?

#4. Are gases fluids?

#5. What the the most dense state of matter?

#6. Which of these best describes metallic bonding?

#7. Alkalis produce an excess of what when they dissolve in water?

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

#9. True or false. All atoms of the same element have the same atomic number.

#10. Which of the following are weak acids?

#11. What is the chemical symbol for oxygen?

#12. Fill in the blanks: Reduction refers to the …… of electrons and it occurs at the ……..

#13. In which type of reaction would the temperature of a solution increase?

#14. What is the chemical symbol for copper?

#15. Why are metals malleable?

#16. Why is diamond hard?

#17. What is the chemical symbol for silver?

#18. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?

#19. What is the chemical symbol for sodium?

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

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

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

#23. What is the chemical symbol for carbon?

#24. Are metals usually good conductors of electricity?

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

#26. H₂SO₄(aq) + Na₂O(s) → …. + ….

#27. How many atoms of potassium (group 1) are needed to bond ionically with oxygen (group 6)?

#28. What are giant covalent structures?

#29. What is the boiling temperature of water?

#30. Which of these is the stationary phase in paper chromatography?

#31. During Ernest Rutherford’s experiments with gold foil, why did some of the particles bounce back?

#32. Which electrode would the ion Mg²⁺ migrate to during electrolysis?

#33. 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 anode. Cu → ….. + …..

#34. Which type of reaction takes in energy, making the surroundings cooler?

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

#36. What is the chemical symbol for radium?

#37. Are metals usually malleable or brittle?

#38. Oxygen is in group 6 and fluorine is in group 7. How many fluorine atoms bond with one oxygen atom?

#39. What is the relative mass of an electron?

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

#41. Determine the empirical formula for Cyclopentane – C₅H₁₀?

#42. True or false – Precipitation reactions can be either exothermic or endothermic.

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

#44. True or false – You cannot use physical processes to separate mixtures into different substances.

#45. Hydrogen has two stable isotopes, ¹H (abundance – 99.972%) and ²H (abundance – 0.001%). Calculate the Aᵣ of hydrogen. Answer to 3 decimal places.

#46. Filtration and crystallisation are used to separate which types of materials?

#47. This image shows the apparatus used during fractional distillation. What is function of the fractionating column?

#48. During a neutralisation reaction which salt is formed from nitric acid?

#49. What type of substance is the air?

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

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

#52. What is the charge of an electron?

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

#54. What is the chemical symbol for iodine?

#55. Do non-metals usually have a high or low melting point?

#56. What is the chemical symbol for calcium?

#57. What do we use fullerenes for?

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

#59. What is the approximate radius of a nucleus?

#60. Fill in the blanks: Electrolysis is a process in which ………. energy from a ………. current supply is used to decompose electrolytes.

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