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.

solvent

solute

solution

#2. What is the chemical symbol for iron?

#3. Fill in the gap. Metal atoms bond forming a giant ……… of ions.

Lettuce

Anchor

Lattice

Ball

#4. 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 → ….. + …..

Cu²⁺ + 2e

Cu⁺ + e

SO₃²⁻ + 2e

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

Select all that apply:

determining the boiling point of a substance

identifying substances by calculating Rf values

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

distinguishing between pure and impure substances

separating insoluble solids

#6. Relative atomic mass used to have a different name. What was that name?

Molecular molar mass

Relative formula mass

Atomic weight

#7. Solutions of less than pH 7 are?

acidic

neutral

alkaline

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

desalination

demicronation

unsaturation

#9. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?

Cathode: Bromine (Br₂) (g) Anode: Lead (Pb) (s)

Cathode: Hydrogen (H₂) (g) Anode: Lead (Pb) (s)

Cathode: Lead (Pb) (s) Anode: Bromine (Br₂) (g)

#10. What is the chemical symbol for mercury?

#11. What type of substance is carbon dioxide (CO₂ )?

Mixture

Element

Compound

#12. Why is magnesium a better electrical conductor than sodium?

Group 1 sodium is less electrically conductive because it quickly forms impurities that prevent efficient conduction

Group 2 magnesium has two spare electrons to donate to the delocalised pool, whereas, sodium atoms only have one electron to donate. This means there are more electrons to carry the charge

#13. What are negative ions called?

#14. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?

Cathode: Hydrogen (H₂) Anode: Chlorine (Cl₂)

Cathode: Copper (Cu) Anode: Chlorine (Cl₂)

Cathode: Copper (Cu) Anode: Hydrogen (H₂)

Cathode: Copper (Cu) Anode: Chlorine (OH⁻)

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

Select all that apply:

H₂O

KCl

ClOH

O

H₂

#16. What is the chemical symbol for sulfur?

#17. What is the chemical symbol for potassium?

#18. What is the formula for nitric acid?

KOH

H₂SO₄

HCL

NaOH

Ca(OH)₂

HNO₃

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

#20. What is the chemical symbol for radon?

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

Endothermic

Mesothermic

Ectothermic

Exothermic

#22. What are giant covalent structures?

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

Ionically bonded substances such as sodium bromide

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

#23. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?

Remainder

Leftovers

Residue

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

Select all that apply:

MgS₂

H₂O (l)

HO (l)

MgS (g)

MgSO₄ (aq)

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

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

CaNO₂

Ca(NO₃)₂

Ca(NO₂)₂

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

CO₃²⁻

NO₃⁻

OH⁻

SO₄²⁻

NH₄⁺

SO₃²⁻

#27. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.

#28. Covalent compounds typically form between which two types of material?

non-metal and non-metal

metal and non-metal

metal and metal

#29. Why does graphite conduct electricity?

Because it has only three covalent bonds, leaving one delocalised electron from each atom. These electrons are able to carry the charge.

Because it has more protons than electrons, this gives it a positive charge and enables it to carry a charge

#30. Are non-metals usually shiny or dull in colour?

Shiny

Dull

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

Sulfate

Borate

Nitrate

Carbonate

Chloride

#32. 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.

#33. What is the formula for hydrochloric acid?

NaOH

HCL

HNO₃

H₂SO₄

Ca(OH)₂

KOH

#34. What are positive ions called?

anions

cations

#35. Do metals usually have a high or low density?

High density

Low density

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

liquids

plasma

gases

solids

#37. Isotopes of atoms have different numbers of which particles?

Neutrons

Protons

#38. Which description best describes mixtures?

contains only a particular type of atoms

contains more than one type of atoms, chemically bonded together

contains more than one type of atoms, but not chemically bonded together

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

in the nucleus

orbiting the nucleus in the electrons

#40. What is the formula for calcium hydroxide?

Ca(OH)₂

HNO₃

NaOH

H₂SO₄

KOH

HCL

#41. 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.

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

The mean mass of an atom compared with carbon-12

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

The simplest whole number ratio of atoms

#43. A paper chromatography experiment is carried out in a lab. The distance moved by the spot was 6cm and the solvent had moved by 8cm. Calculate the Rf value.

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

Gain, Cathode

Gain, Anode

Loss, Anode

Loss, Cathode

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

True

False

#46. What is a simple molecular structure?

Ionically bonded substances such as sodium bromide

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

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

#47. 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

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

Neutrons

Protons

Electrons

Alpha particles

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

Cathode

Anode

Neither

#50. What is the formula for potassium hydroxide?

NaOH

KOH

HCL

Ca(OH)₂

HNO₃

H₂SO₄

#51. 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

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

Select all that apply:

tripod

filter funnel

filter paper

an evaporating basin

a beaker

a heatproof mat

gauze

a bunsen burner

#53. What is the relative mass of a neutron?

1

2

1/1840

#54. If covalent bonds are very strong, then why does water have a low melting point?

The bonds between hydrogen and oxygen are weaker than typical covalent bonds

Water has a high melting point

There are only weak intermolecular forces between the molecules in water. The atoms remain bonded whilst the molecules become separated.

#55. What the the least dense state of matter?

liquids

gases

Bose-Einstein Condensates

solids

#56. Which of the following are strong acids?

Select all that apply:

carbonic acid

nitric acid

boric acid

hydrochloric acid

sulfuric acid

ethanoic acid

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

1

1/1840

2

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

dull

shiny

#59. What is the chemical symbol for sodium?

#60. 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⁻)

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 chemical symbol for iron?

#3. Fill in the gap. Metal atoms bond forming a giant ……… of ions.

#4. 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 → ….. + …..

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

#6. Relative atomic mass used to have a different name. What was that name?

#7. Solutions of less than pH 7 are?

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

#9. When using inert electrodes to perform electrolysis with molten lead bromide, which products will be produced at the anode and cathode?

#10. What is the chemical symbol for mercury?

#11. What type of substance is carbon dioxide (CO₂ )?

#12. Why is magnesium a better electrical conductor than sodium?

#13. What are negative ions called?

#14. When using inert electrodes to perform electrolysis with copper chloride solution, which products will be produced at the anode and cathode?

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

#16. What is the chemical symbol for sulfur?

#17. What is the chemical symbol for potassium?

#18. What is the formula for nitric acid?

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

#20. What is the chemical symbol for radon?

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

#22. What are giant covalent structures?

#23. After filtering a mixture containing sand, salt and water using filter paper. What do we call what is left in the filter paper?

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

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

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

#27. Calculate the relative formula mass of copper oxide (CuO) to 2 decimal places. Copper Aᵣ = 63.5, Oxygen Aᵣ = 16.

#28. Covalent compounds typically form between which two types of material?

#29. Why does graphite conduct electricity?

#30. Are non-metals usually shiny or dull in colour?

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

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

#33. What is the formula for hydrochloric acid?

#34. What are positive ions called?

#35. Do metals usually have a high or low density?

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

#37. Isotopes of atoms have different numbers of which particles?

#38. Which description best describes mixtures?

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

#40. What is the formula for calcium hydroxide?

#41. Why is diamond hard?

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

#43. A paper chromatography experiment is carried out in a lab. The distance moved by the spot was 6cm and the solvent had moved by 8cm. Calculate the Rf value.

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

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

#46. What is a simple molecular structure?

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

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

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

#50. What is the formula for potassium hydroxide?

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

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

#53. What is the relative mass of a neutron?

#54. If covalent bonds are very strong, then why does water have a low melting point?

#55. What the the least dense state of matter?

#56. Which of the following are strong acids?

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

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

#59. What is the chemical symbol for sodium?

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

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