OCR Combined Science A Papers 3 and 9 Automock

#1. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.

solution

solute

solvent

#2. What is the charge of an electron?

-1

0

+1

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

Select all that apply:

identifying substances by calculating Rf values

separating insoluble solids

distinguishing between pure and impure substances

determining the boiling point of a substance

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

#4. 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

#5. What is the chemical symbol for phosphorus?

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

Cathode

Neither

Anode

#7. What is the chemical symbol for calcium?

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

Electrical, Alternating

Electrical, Direct

Thermal, Direct

Thermal, Indirect

$fractional distillation diagram$

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

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

contains glass rods - is the same temperature throughout - 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

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

Ectothermic

Exothermic

Mesothermic

Endothermic

#11. Why is graphite softer than diamond?

Graphite is softer because the covalent bonds are weaker between atoms of carbon in graphite than in diamond

Graphite is arranged in sheets with weak intermolecular forces holding them together. These can easily slide, making graphite soft.

Graphite is actually harder than diamond

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

The simplest whole number ratio of atoms

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

The mean mass of an atom compared with carbon-12

#13. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.

#14. During electrolysis which electrode do anions and cations migrate to?

Anions to the cathode, cations to the anode

Anions to the anode, cations to the cathode

#15. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

Na₂SO₄(aq)

MgOH

H₂O (l)

NaOH

2H₂O (l)

#16. Are gases fluids?

Yes

No

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

melting

deposition

condensation

sublimation

evaporation/boiling

freezing

#18. 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

#19. Which of the following descriptions matches the term empirical formula?

Represents the actual number of atoms of each element in a molecule

Is the sum of the relative atomic masses

Represents the simplest integer ratio of atoms or ions of each element in a compound

#20. What is the chemical symbol for sulfur?

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

2

1

0 or 1/1840

#22. What is the chemical symbol for radon?

#23. Complete the following equation: MgO (s) + H₂SO₄ (aq) → …. + ….

Select all that apply:

H₂O (l)

MgSO₄ (aq)

MgS (g)

MgS₂

HO (l)

Neutralisation reactions follow the general structure –

metal oxide acid = salt water

the acid produces hydrogen ions and the metal oxide produces oxide ions – these combine to make the water

the salt is comprised of the remaining products – the metal and the other element from the acid

in this case, the other element is chlorine

The naming convention is to put the metal first for the salt created

#24. What is a simple molecular structure?

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

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

Ionically bonded substances such as sodium bromide

#25. Complete the equation: HCl (aq) → H⁺(aq) + …..

Cl⁻(l)

Cl⁻(s)

Cl⁻(aq)

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

False

True

#27. Which scientist proposed the Plum Pudding Model?

JJ. Thomson

Ernest Rutherford

John Dalton

#28. What is the chemical symbol for radium?

#29. 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 →

CuO

SO₄²⁻

Cu

#30. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?

Pure

Impure

#31. What type of substance is pure gold (Au)?

Element

Compound

Mixture

#32. What is the chemical symbol for sodium?

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

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

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

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

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

evaporation/boiling

deposition

melting

condensation

freezing

sublimation

#35. What is the chemical symbol for hydrogen?

#36. How many sulfur atoms will react with two lithium atoms to form an ionic compound?

3

2

1

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

Yes

No

#38. Which of these is a problem with 3D ball and stick models?

The model shows the atoms as being too far apart and there are no sticks

They do not show how the structure formed and suggest that the electrons in different atoms are different, but they are actually the same

The model does not show that the ions will be constantly vibrating

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

Nitrate

Borate

Sulfate

Chloride

Carbonate

#40. After paper chromatography has been carried out, the paper is known as?

a still

a chromatogram

a wet piece of paper

#41. What is the mass number of an element?

the number of protons plus neutrons

the total number of subatomic particles in an atom

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

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

Select all that apply:

atoms can be created and destroyed

all matter is made up of tiny spheres called atoms

atoms cannot be created or destroyed

atoms cannot be broken down into smaller parts

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

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

#44. Determine the empirical formula for Cyanuric triazide – C₃N₁₂.

CN₄

C₄N₄

CN

C₂N₄

#45. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#46. Which of the following describes the Plum Pudding Model of atomic structure?

A central nucleus containing protons and neutrons, surrounded by electrons at discrete energy levels (shells)

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

#47. What is the charge of a proton?

-1

+1

0

#48. What is the formula for sulfuric acid?

NaOH

HCL

KOH

HNO₃

H₂SO₄

Ca(OH)₂

#49. What is the boiling temperature of water?

55˚C

66.5˚C

100˚C

10˚C

30˚C

25˚C

#50. What is the chemical symbol for helium?

#51. What is the chemical symbol for nitrogen?

#52. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?

Ca(NO₂)₂

CaNO₂

Ca(NO₃)₂

#53. What are negative ions called?

#54. Where is most of the mass of an atom?

orbiting the nucleus in the electrons

in the nucleus

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

Loss, Anode

Gain, Anode

Loss, Cathode

Gain, Cathode

#56. Which description most accurately describes covalent bonding

electrons are shared between atoms

electrons are transferred between atoms

#57. 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 it is made of ionically bonded carbon atoms.

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

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

liquids

gases

solids

#59. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….

Select all that apply:

electrons

positrons

water

a different acid

salt

GCSE OCR Combined Science A Papers 3 and 9

Good Luck!

Results

#1. Match the following description to the correct term. X is a mixture made of dissolved substances in a liquid.

#2. What is the charge of an electron?

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

#4. What do we use fullerenes for?

#5. What is the chemical symbol for phosphorus?

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

#7. What is the chemical symbol for calcium?

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

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

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

#11. Why is graphite softer than diamond?

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

#13. Chlorine has two stable isotopes, ³⁵Cl (75.77%) and ³⁷Cl (24.23%). Calculate the Aᵣ of chlorine to 2 decimal places.

#14. During electrolysis which electrode do anions and cations migrate to?

#15. H₂SO₄(aq) + Na₂O(s) → …. + ….

#16. Are gases fluids?

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

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

#19. Which of the following descriptions matches the term empirical formula?

#20. What is the chemical symbol for sulfur?

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

#22. What is the chemical symbol for radon?

#23. Complete the following equation: MgO (s) + H₂SO₄ (aq) → …. + ….

#24. What is a simple molecular structure?

#25. Complete the equation: HCl (aq) → H⁺(aq) + …..

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

#27. Which scientist proposed the Plum Pudding Model?

#28. What is the chemical symbol for radium?

#29. 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 →

#30. The graph shows a heating curve for substance X (red) and substance Y (blue). Is substance Y a pure or impure substance?

#31. What type of substance is pure gold (Au)?

#32. What is the chemical symbol for sodium?

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

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

#35. What is the chemical symbol for hydrogen?

#36. How many sulfur atoms will react with two lithium atoms to form an ionic compound?

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

#38. Which of these is a problem with 3D ball and stick models?

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

#40. After paper chromatography has been carried out, the paper is known as?

#41. What is the mass number of an element?

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

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

#44. Determine the empirical formula for Cyanuric triazide – C₃N₁₂.

#45. Calculate the relative formula mass of carbon monoxide (CO) to 2 decimal places. Carbon Aᵣ = 12, Oxygen Aᵣ = 16.

#46. Which of the following describes the Plum Pudding Model of atomic structure?

#47. What is the charge of a proton?

#48. What is the formula for sulfuric acid?

#49. What is the boiling temperature of water?

#50. What is the chemical symbol for helium?

#51. What is the chemical symbol for nitrogen?

#52. What is the formula for the compound calcium nitrate which is made of calcium and nitrate ions (NO₃⁻)?

#53. What are negative ions called?

#54. Where is most of the mass of an atom?

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

#56. Which description most accurately describes covalent bonding

#57. Why is diamond hard?

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

#59. Complete the following equation describing a neutralisation reaction with a metal oxide: metal oxide + acid → …. + ….

#60. What is the formula for potassium oxide? ? you might need a periodic table to answer this question

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