OCR Combined Science A Papers 3 and 9 Automock

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

Select all that apply:

HZnO₄ (s)

H₂O (l)

H₂SO₄ (aq)

H₂SO₄ (l)

ZnSO₄ (aq)

#2. Which of the following descriptions matches the Aᵣ of an element?

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

The simplest whole number ratio of atoms

#3. Which of these is a problem with metallic models?

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

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

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

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

Mesothermic

Exothermic

Endothermic

Ectothermic

#5. What is the approximate radius of an atom?

1 x 10⁻¹⁰

1 x 10⁻¹⁵

1 x 10⁻³

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

Select all that apply:

MgS (g)

MgS₂

H₂O (l)

MgSO₄ (aq)

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

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

hydroxide ions

carbonate ions

hydrogen ions

sulfate ions

#8. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.

The most reactive ions

Always the ions from the salt e.g. Na⁺

The least reactive ions

#9. Which type of reaction is aerobic respiration?

Endothermic

Ectothermic

Mesothermic

Exothermic

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

False

True

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

Select all that apply:

H₂

H₂O

O

ClOH

KCl

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

Nitrate

Chloride

Carbonate

Borate

Sulfate

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

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

1

3

2

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

Cl⁻(l)

Cl⁻(s)

Cl⁻(aq)

#16. 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

#17. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → …. + …. + ….

Select all that apply:

water

oxygen

ozone

carbon dioxide

salt

#18. Paper chromatography is used to separate which types of materials?

separate soluble materials from insoluble materials

separating soluble compounds

separate different types of liquids

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

Yes

No

#20. Most ionic bonds are formed between which groups?

non-metals and non-metals

metals and metals

metals and non-metals

#21. What is the chemical symbol for iron?

#22. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……

Select all that apply:

Electricity

Electromagnetic waves

Sound

Heat

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

Neutrons

Protons

#24. Why does the temperature of a material stay constant during the transition from liquid to gas?

the temperature is not relevant to states of matter

the particles are breaking the bonds with surrounding particles - this takes energy

the particles are figuring out what to do

#25. Can strong and weak acids have the same pH?

not sure

yes

no

#26. Are non-metals usually good conductors of heat?

Yes

No

#27. What is the formula for the polyatomic ion ammonium?

OH⁻

SO₃²⁻

NO₃⁻

CO₃²⁻

NH₄⁺

SO₄²⁻

#28. Which of these descriptions best describes fullerenes?

Fullerenes are tubes or balls of carbon atoms with each carbon covalently bonded to three other carbons.

Fullerenes are the same as simple molecular compounds

Fullerenes are a group of extremely hard non-metal substances that are typically found deep underground.

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

melting

evaporation/boiling

deposition

sublimation

condensation

freezing

#30. 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.

#31. What are ions?

atoms which have different numbers of neutrons

atoms which have different numbers of protons

atoms which have gained or lost electrons

#32. What is the freezing point of water?

100˚C

55˚C

25˚C

30˚C

66.5˚C

0˚C

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

solids

liquids

gases

#34. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..

2Pb

Ld

Pb

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

Shiny

Dull

#36. What is the charge of an electron?

+1

0

-1

#37. Solutions of pH 7 are?

neutral

alkaline

acidic

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

Electrical

Thermal

Chemical

#39. Which scientist proposed the Plum Pudding Model?

John Dalton

JJ. Thomson

Ernest Rutherford

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

Select all that apply:

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

all matter is made up of tiny spheres called atoms

atoms can be created and destroyed

atoms cannot be created or destroyed

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

atoms cannot be broken down into smaller parts

#41. When a mixture of rocks, salt and water is filtered, what will be the residue?

sand

salt

rocks

water

#42. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?

2

3

1

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

e

Zn

ZnO

2e

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

no

yes

#45. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?

flaccid

saturated

dilute

#46. What is the formula for the polyatomic ion carbonate?

NH₄⁺

NO₃⁻

SO₃²⁻

CO₃²⁻

OH⁻

SO₄²⁻

#47. Which of the following are weak acids?

Select all that apply:

nitric acid

boric acid

sulfuric acid

carbonic acid

hydrochloric acid

ethanoic acid

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

Impure

Pure

#49. What is the symbol for relative formula mass (also known as relative molecular mass)?

Aᵣ

MAᵣ

Mᵣ

Hᵣ

#50. Why is graphite softer than diamond?

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

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

Graphite is actually harder than diamond

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

the paper

the ink

the solvent

#52. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?

solid

gas

liquid

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

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

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

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

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

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

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

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

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

#55. What is the formula for sodium hydroxide?

HCL

H₂SO₄

KOH

Ca(OH)₂

HNO₃

NaOH

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

the paper

the ink

the solvent

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

Cathode

Neither

Anode

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

Pure

Impure

#59. 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

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

2,5

2,7

2,8,5

GCSE OCR Combined Science A Papers 3 and 9

Good Luck!

Results

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

#2. Which of the following descriptions matches the Aᵣ of an element?

#3. Which of these is a problem with metallic models?

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

#5. What is the approximate radius of an atom?

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

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

#8. In aqueous solutions such as sodium chloride solution, there will be positively charged ions from the salt (Na⁺) as well as hydrogen ions (H⁺). What is the rule that determines which will be discharged at the cathode.

#9. Which type of reaction is aerobic respiration?

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

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

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

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

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

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

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

#17. Complete the following equation describing a reaction with a metal carbonate and an acid: metal carbonate + acid → …. + …. + ….

#18. Paper chromatography is used to separate which types of materials?

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

#20. Most ionic bonds are formed between which groups?

#21. What is the chemical symbol for iron?

#22. Since metallically bonded atoms have a delocalised pool of electrons, these electrons are able to conduct ……

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

#24. Why does the temperature of a material stay constant during the transition from liquid to gas?

#25. Can strong and weak acids have the same pH?

#26. Are non-metals usually good conductors of heat?

#27. What is the formula for the polyatomic ion ammonium?

#28. Which of these descriptions best describes fullerenes?

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

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

#31. What are ions?

#32. What is the freezing point of water?

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

#34. Complete the following half equation for a reaction the cathode during electrolysis of molten lead bromide. Pb²⁺ + 2e → …..

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

#36. What is the charge of an electron?

#37. Solutions of pH 7 are?

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

#39. Which scientist proposed the Plum Pudding Model?

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

#41. When a mixture of rocks, salt and water is filtered, what will be the residue?

#42. Calcium nitrate contains the polyatomic ion NO₃⁻ (nitrate) and calcium. How many nitrate ions will be needed to make one molecule of calcium nitrate?

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

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

#45. What is a solution called when it contains the maximum amount of solute that can dissolve in a solvent at a particular temperature?

#46. What is the formula for the polyatomic ion carbonate?

#47. Which of the following are weak acids?

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

#49. What is the symbol for relative formula mass (also known as relative molecular mass)?

#50. Why is graphite softer than diamond?

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

#52. The melting point of gallium is 29.8˚C and the boiling point is 2204˚C. What state is gallium at 25˚C?

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

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

#55. What is the formula for sodium hydroxide?

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

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

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

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

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

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