GCSE OCR Chemistry B Paper 1 Automarked

#1. Which of the following are commonly used as methods of sterilising fresh water? ? 3

Select all that apply:

alpha particle treatment

UV treatment

ozonation

chlorination

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

Electrical, Alternating

Thermal, Indirect

Thermal, Direct

Electrical, Direct

#3. What is the chemical symbol for gold?

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

hydrogen ions

sulfate ions

hydroxide ions

sulfite ions

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

Impure

Pure

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

1

2

3

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

Select all that apply:

all matter is made up of tiny spheres called atoms

atoms can be created and destroyed

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

atoms cannot be broken down into smaller parts

atoms cannot be created or destroyed

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

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

CN₄

C₂N₄

CN

C₄N₄

#9. Strong acids do what in water? ? two words

#10. 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.

#11. Solutions of more than pH 7 are?

neutral

alkaline

acidic

#12. 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

#13. 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

#14. What is the chemical symbol for silver?

#15. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?

water from source --> chlorine added --> filtration tower --> sedimentation tank --> storage --> water pumped to homes

water from source --> sedimentation tank --> filtration tower --> chlorine added --> storage --> water pumped to homes

water from source --> filtration tower --> chlorine added --> water pumped to homes

#16. Which types of atoms can be found in a pure piece of gold?

Select all that apply:

carbon atoms

gold atoms

trace amounts of other elements

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

Select all that apply:

HZnO₄ (s)

H₂SO₄ (l)

H₂SO₄ (aq)

ZnSO₄ (aq)

H₂O (l)

#18. Which three particles are atoms composed of?

#19. What is the chemical symbol for phosphorus?

#20. Which of the following are the main sources of drinking water in the UK?

Select all that apply:

lakes

seawater

rivers

aquifers

#21. What is the chemical symbol for fluorine?

#22. Is it possible to control the rate of reaction?

Yes

No

#23. How did the oceans form?

Water vapour in the atmosphere condensed as the Earth cooled, forming the oceans

Liquid water gradually seeped directly out of the Earths crust, for thousands of years

Liquid water spontaneously formed when the ammonia and and methane in the atmosphere interacted chemically

#24. Which of these are common properties of giant covalent materials?

Do not conduct electricity

Insoluble in water

Conduct electricity

High melting/boiling points

Low melting/boiling points

Soluble in water

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

OH⁻

NO₃⁻

NH₄⁺

SO₃²⁻

SO₄²⁻

CO₃²⁻

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

Ball

Anchor

Lattice

Lettuce

#27. Can Rf values be higher than 1?

Under certain conditions

No

Yes

#28. Which type of reaction is photosynthesis?

Exothermic

Ectothermic

Endothermic

#29. Which evidence provides information about carbon dioxide concentration and global temperatures?

Using the oldest continuous temperature measurements from humans and using computers to predict long term trends with this data

Ice cores which trap atmospheric gases when snow falls producing layers over time

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

Mᵣ

AMᵣ

Gᵣ

Aᵣ

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

demicronation

desalination

unsaturation

#32. Which of the following are weak acids?

Select all that apply:

hydrochloric acid

sulfuric acid

carbonic acid

boric acid

ethanoic acid

nitric acid

#33. Is water an example of a covalent compound?

Yes

No

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

Cathode

Anode

Neither

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

saturated

flaccid

dilute

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

1 x 10⁻³

1 x 10⁻⁴

1 x 10⁻⁵

1 x 10⁻¹⁵

#37. What is the chemical symbol for oxygen?

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

2,5

2,8,5

2,7

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

CO₃²⁻

SO₃²⁻

NO₃⁻

OH⁻

SO₄²⁻

NH₄⁺

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

2

1/1840

1

#41. Why do simple molecules not conduct electricity?

All simple molecules are in the gaseous state and so electrons are too far apart to transfer a charge

Simple molecules are aligned in the direction opposite to the flow of current. This means that they oppose the flow of electricity.

Simple molecules do not have an overall charge, making them unable to carry a charge and conduct electricity.

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

melting

condensation

evaporation/boiling

freezing

sublimation

deposition

#43. What do group 2 atoms do when they bond with group 6 atoms?

gain one proton

lose two electrons

lose two neutrons

gain two electrons

#44. Why do we use distilled water for chemical analysis?

distilled water is cheaper than tap water

tap water contains small amounts of dissolved salts which could contaminate the results

distilled water is warmer so it is better for conducting chemical analysis

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

2CH

CH₂

C₂H₂

CH₄

#46. What is graphene?

Graphene is a layer of graphite that is one atom thick

Graphene is a small section of a diamond

Graphene is the material that forms from the covalent bonding of oxygen and nitrogen

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

Nitrate

Borate

Carbonate

Chloride

Sulfate

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

#49. 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.

#50. What is the chemical symbol for chlorine?

#51. What is an electrolyte?

An ionic compound in a molten or dissolved state

A covalent compound in a molten or dissolved state

A solvent such as water

#52. Which of these are common properties of simple molecular (covalent) materials?

Select all that apply:

low melting/boiling points

do not conduct electricity

high melting/boiling points

are good conductors of electricity

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

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

the temperature is not relevant to states of matter

the particles are figuring out what to do

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

Atomic weight

Molecular molar mass

Relative formula mass

#55. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

MgOH

2H₂O (l)

NaOH

Na₂SO₄(aq)

H₂O (l)

#56. Are metals usually good conductors of electricity?

No

Yes

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

Most of the atoms passed straight through the foil

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

Most of the atoms were deflected or bounced back

#58. Which type of reaction is aerobic respiration?

Exothermic

Endothermic

Ectothermic

Mesothermic

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

Pb

Ld

2Pb

#60. Complete the equation: NaOH(aq) → Na⁺(aq) + ….

NO⁻(aq)

HO⁻(aq)

OH⁻(aq)

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

#62. What is the formula for nitric acid?

NaOH

KOH

Ca(OH)₂

H₂SO₄

HCL

HNO₃

#63. What is the chemical symbol for potassium?

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

Mesothermic

Ectothermic

Endothermic

Exothermic

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

1 x 10⁻³

1 x 10⁻¹⁵

1 x 10⁻¹⁰

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

Carbonate

Sulfate

Borate

Nitrate

Chloride

#67. What are ions?

atoms which have different numbers of protons

atoms which have different numbers of neutrons

atoms which have gained or lost electrons

#68. What is the chemical symbol for copper?

#69. Which description most accurately describes covalent bonding

electrons are shared between atoms

electrons are transferred between atoms

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

chloride

nitrate

borate

carbonate

sulfate

#71. Why is diamond hard?

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

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.

#72. What type of substance is the air?

Select all that apply:

Mixture

Element

Compound

#73. Are metals usually good conductors of heat?

No

Yes

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

compound

mixture

element

#75. What is the chemical symbol for sulfur?

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

1

3

2

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

liquids

gases

plasma

solids

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

Residue

Leftovers

Remainder

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

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

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

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

#81. Which of the following are effects of climate change?

Select all that apply:

More extreme weather events (stronger storms, rainfall and droughts)

Rising sea levels due to ice in the south pole and in glaciers melting

Rising ocean temperatures causing coral bleaching and other adverse effects

Lower pH of oceans due to dissolving carbon dioxide producing carbonic acid

Extinctions of species unable to migrate or adapt to higher temperatures

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

High density

Low density

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

1

3

2

#84. Will endothermic reactions continue if there is no energy input?

Yes, until reactants run out

No, even if there are still reactants

#85. Calculate the relative formula mass of water. Hydrogen Aᵣ = 1, Oxygen Aᵣ = 16.

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

Dull

Shiny

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

lose two electrons

lose one electron

gain one electron

gain two electrons

#88. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?

Rate of reaction is highest at very high and very low temperatures

As temperature increases, rate of reaction increases

As temperature increases, rate of reaction decreases

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

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.

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

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

Select all that apply:

putting a cover over the evaporating dish

removing the bunsen burner before solution is dry

using steam to heat the evaporating basin carefully

wearing eye protection

GCSE OCR Chemistry B Paper 1

Good Luck!

Results

#1. Which of the following are commonly used as methods of sterilising fresh water? ? 3

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

#3. What is the chemical symbol for gold?

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

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

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

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

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

#9. Strong acids do what in water? ? two words

#10. 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.

#11. Solutions of more than pH 7 are?

#12. 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 → ….. + …..

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

#14. What is the chemical symbol for silver?

#15. Fresh water contains many different contaminants and so must be cleaned before it becomes potable. Which is the correct treatment path?

#16. Which types of atoms can be found in a pure piece of gold?

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

#18. Which three particles are atoms composed of?

#19. What is the chemical symbol for phosphorus?

#20. Which of the following are the main sources of drinking water in the UK?

#21. What is the chemical symbol for fluorine?

#22. Is it possible to control the rate of reaction?

#23. How did the oceans form?

#24. Which of these are common properties of giant covalent materials?

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

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

#27. Can Rf values be higher than 1?

#28. Which type of reaction is photosynthesis?

#29. Which evidence provides information about carbon dioxide concentration and global temperatures?

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

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

#32. Which of the following are weak acids?

#33. Is water an example of a covalent compound?

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

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

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

#37. What is the chemical symbol for oxygen?

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

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

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

#41. Why do simple molecules not conduct electricity?

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

#43. What do group 2 atoms do when they bond with group 6 atoms?

#44. Why do we use distilled water for chemical analysis?

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

#46. What is graphene?

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

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

#49. Why is graphite softer than diamond?

#50. What is the chemical symbol for chlorine?

#51. What is an electrolyte?

#52. Which of these are common properties of simple molecular (covalent) materials?

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

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

#55. H₂SO₄(aq) + Na₂O(s) → …. + ….

#56. Are metals usually good conductors of electricity?

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

#58. Which type of reaction is aerobic respiration?

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

#60. Complete the equation: NaOH(aq) → Na⁺(aq) + ….

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

#62. What is the formula for nitric acid?

#63. What is the chemical symbol for potassium?

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

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

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

#67. What are ions?

#68. What is the chemical symbol for copper?

#69. Which description most accurately describes covalent bonding

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

#71. Why is diamond hard?

#72. What type of substance is the air?

#73. Are metals usually good conductors of heat?

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

#75. What is the chemical symbol for sulfur?

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

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