GCSE OCR Chemistry A Papers 1 and 3 Automarked

#1. Neutralisation reactions which occur between an acid and a base are always:

Endothermic

Exothermic

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

Gain, Cathode

Loss, Cathode

Loss, Anode

Gain, Anode

#3. Do non-metals usually have a high or low density?

Low

High

#4. What is the formula for calcium hydroxide?

H₂SO₄

HCL

Ca(OH)₂

NaOH

KOH

HNO₃

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

e

ZnO

2e

Zn

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

Select all that apply:

MgS (g)

H₂O (l)

MgSO₄ (aq)

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

#7. What is the chemical symbol for potassium?

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

Carbonate

Borate

Sulfate

Chloride

Nitrate

#9. What is the chemical symbol for fluorine?

#10. 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

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

Ld

2Pb

Pb

#12. What is the chemical symbol for sodium?

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

Select all that apply:

positrons

electrons

water

a different acid

salt

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

Endothermic

Exothermic

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

High density

Low density

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

sulfate ions

hydrogen ions

hydroxide ions

sulfite ions

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

Select all that apply:

filter funnel

tripod

gauze

a bunsen burner

filter paper

a heatproof mat

an evaporating basin

a beaker

#18. What are giant covalent structures?

a 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

#19. 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

#20. What do group one atoms do when they bond ionically with group 7 atoms?

lose two electrons

gain one electron

gain two electrons

lose one electron

#21. 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 figuring out what to do

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

#22. Which of the following are the 4 factors that affect the rate of photosynthesis?

Select all that apply:

Air temperature

Concentration of atmospheric nitrogen

Amount of chloroplasts in cells

Availability of nitrogen in the soil

Concentration of atmospheric carbon dioxide

Light intensity

Concentration of dissolved oxygen in the soil

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

Gain, Cathode

Loss, Anode

Gain, Anode

Loss, Cathode

#24. The table shows 3 substances and their melting points. Which types of substances could Y be?

Select all that apply:

compound

element

mixture

#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. Most ionic bonds are formed between which groups?

metals and metals

metals and non-metals

non-metals and non-metals

#27. What is the charge of an electron?

-1

+1

0

#28. What do we use fullerenes for?

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

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

#29. What is the chemical symbol for iodine?

#30. What temperature is the boiling point of water?

#31. What is the chemical symbol for helium?

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

Aᵣ

Mᵣ

Hᵣ

MAᵣ

#33. What is the chemical symbol for magnesium?

#34. 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.

#35. 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

#36. 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.

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

separate soluble materials from insoluble materials

separate different types of liquids

separating soluble compounds

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

melting

freezing

evaporation/boiling

sublimation

deposition

condensation

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

Impure

Pure

#40. What is the chemical symbol for nitrogen?

#41. Which of these descriptions best describes fullerenes?

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

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

#42. Which description best describes a compound?

contains more than one type of atoms, chemically bonded together

contains only one type of atom

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

#43. 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

#44. Are metals usually good conductors of electricity?

No

Yes

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

Neither

Cathode

Anode

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

High

Low

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

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

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

#48. What is the formula for sodium hydroxide?

KOH

Ca(OH)₂

HCL

H₂SO₄

NaOH

HNO₃

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

#50. 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

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

orbiting the nucleus in the electrons

in the nucleus

#52. Which type of reaction is aerobic respiration?

Exothermic

Mesothermic

Ectothermic

Endothermic

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

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

use paper chromatography to separate the sand from the salt

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

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

The mean mass of an atom compared with carbon-12

The simplest whole number ratio of atoms

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

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

demicronation

unsaturation

desalination

#56. 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 hydroxide regardless of the other ions

Always the other ions and never the hydroxide

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

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

Select all that apply:

salt

electrons

oxygen

hydrogen

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

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

1

0 or 1/1840

2

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

1 x 10⁻³

1 x 10⁻¹⁵

1 x 10⁻¹⁰

1 x 10⁻³

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

1 x 10⁻³

1 x 10⁻⁵

1 x 10⁻¹⁵

1 x 10⁻⁴

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

#63. What type of substance is the air?

Select all that apply:

Mixture

Element

Compound

#64. What is the formula for sulfuric acid?

KOH

HCL

Ca(OH)₂

H₂SO₄

HNO₃

NaOH

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

AMᵣ

Gᵣ

Mᵣ

Aᵣ

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

freezing

evaporation/boiling

melting

deposition

sublimation

condensation

#67. What is a polymer?

A chain of simple molecules known as monomers

A multidirectional molecule with spikes pointing towards the Earth's poles

A metallic compound

#68. 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

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

Water has a high melting point

$fractional distillation diagram$

#69. 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

#70. 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 actually harder than diamond

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

#71. Determine the empirical formula of glucose – C₆H₁₂O₆.

C₂OH

CHO₂

CH₂O

C₂H₂O

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

yes

not sure

no

#73. What does the atomic number of an element mean?

The number of neutrons in its nucleus

The number of electrons in shells surrounding the nucleus

The number of protons in its nucleus

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

freezing

evaporation/boiling

sublimation

condensation

melting

deposition

#75. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question

ionically

metallically

covalently

#76. Which of the following are properties of ionic compounds?

usually soluble

high melting and boiling points

low melting and boiling points

conduct electricity when molten or dissolved

usually insoluble

conduct electricity as solids

#77. Which description most accurately describes covalent bonding

electrons are shared between atoms

electrons are transferred between atoms

#78. Which of the following descriptions matches the term molecular formula?

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

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

Is the sum of the relative atomic masses

#79. Which of these is a problem with dot and cross diagrams?

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

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

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

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

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

1

1/1840

2

#82. During a neutralisation reaction which salt is formed from hydrochloric acid?

sulfate

nitrate

chloride

carbonate

borate

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

NH₄⁺

CO₃²⁻

NO₃⁻

OH⁻

SO₄²⁻

SO₃²⁻

#84. What is the chemical symbol for calcium?

#85. During crystallisation, there is a risk of spitting which could cause harm. Which of the following could reduce the risk?

Select all that apply:

wearing eye protection

removing the bunsen burner before solution is dry

putting a cover over the evaporating dish

using steam to heat the evaporating basin carefully

#86. The table shows 3 substances and their melting points. Which type of substance is X?

mixture

element

compound

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

the number of protons plus neutrons

the total number of subatomic particles in an atom

#88. 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

#89. What is the chemical symbol for carbon?

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

True

False

GCSE OCR Chemistry Papers 1 and 3

Good Luck!

Results

#1. Neutralisation reactions which occur between an acid and a base are always:

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

#3. Do non-metals usually have a high or low density?

#4. What is the formula for calcium hydroxide?

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

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

#7. What is the chemical symbol for potassium?

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

#9. What is the chemical symbol for fluorine?

#10. 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 →

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

#12. What is the chemical symbol for sodium?

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

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

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

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

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

#18. What are giant covalent structures?

#19. 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.

#20. What do group one atoms do when they bond ionically with group 7 atoms?

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

#22. Which of the following are the 4 factors that affect the rate of photosynthesis?

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

#24. The table shows 3 substances and their melting points. Which types of substances could Y be?

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

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

#27. What is the charge of an electron?

#28. What do we use fullerenes for?

#29. What is the chemical symbol for iodine?

#30. What temperature is the boiling point of water?

#31. What is the chemical symbol for helium?

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

#33. What is the chemical symbol for magnesium?

#34. 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.

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

#36. 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.

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

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

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

#40. What is the chemical symbol for nitrogen?

#41. Which of these descriptions best describes fullerenes?

#42. Which description best describes a compound?

#43. Why are metals malleable?

#44. Are metals usually good conductors of electricity?

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

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

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

#48. What is the formula for sodium hydroxide?

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

#50. What is a simple molecular structure?

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

#52. Which type of reaction is aerobic respiration?

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

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

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

#56. 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.

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

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

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

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

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

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

#63. What type of substance is the air?

#64. What is the formula for sulfuric acid?

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

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

#67. What is a polymer?

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

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

#70. Why is graphite softer than diamond?

#71. Determine the empirical formula of glucose – C₆H₁₂O₆.

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

#73. What does the atomic number of an element mean?

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

#75. How do sodium and chlorine atoms bond? ? you might need a periodic table to answer this question

#76. Which of the following are properties of ionic compounds?

#77. Which description most accurately describes covalent bonding