GCSE OCR Chemistry A Papers 1 and 3 Automarked

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

Select all that apply:

gold atoms

carbon atoms

trace amounts of other elements

#2. A soluble base is called?

a biscuit

an antacid

an alkali

#3. 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

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

enter answer here...

#5. Determine the empirical formula for Cyclopentane - C₅H₁₀?

CH₄

C₂H₂

CH₂

2CH

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

No

Yes

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

Exothermic

Endothermic

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

Shiny

Dull

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

melting

evaporation/boiling

freezing

condensation

deposition

sublimation

#10. 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

#11. What is the boiling temperature of water?

66.5˚C

30˚C

55˚C

25˚C

100˚C

10˚C

#12. What is the formula for calcium hydroxide?

Ca(OH)₂

HNO₃

H₂SO₄

NaOH

KOH

HCL

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

demicronation

unsaturation

desalination

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

separate different types of liquids

separating soluble compounds

separate soluble materials from insoluble materials

#15. What is the chemical symbol for nitrogen?

enter answer here...

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

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

#17. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

beta particles

alpha particles

gamma rays

#18. What is the charge of a neutron?

0

+1

-1

#19. Determine the empirical formula of glucose - C₆H₁₂O₆.

C₂OH

CHO₂

CH₂O

C₂H₂O

#20. What type of substance is the air?

enter answer here...

#21. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

Exothermic

Mesothermic

Ectothermic

Endothermic

$fractional distillation diagram$

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

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

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

#23. What are ions?

atoms which have different numbers of protons

atoms which have different numbers of neutrons

atoms which have gained or lost electrons

#24. What is the freezing point of water?

100˚C

66.5˚C

30˚C

25˚C

0˚C

55˚C

#25. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

Select all that apply:

Chloroplasts migrate back into the stems overnight - protects them from cold weather

Transparent epidermis - allows sunlight to travel straight into the leaves

Palisade layer filled with chloroplasts is just below the epidermis - maximising light intensity

Guard cells open and close the entrance to leaves from stems - isolates infected leaves

Guard cells open and close stomata - control water loss

#26. What is the chemical symbol for magnesium?

enter answer here...

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

Sound

Electricity

Heat

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

True

False

#29. Solutions of pH 7 are?

neutral

acidic

alkaline

#30. What is the chemical symbol for mercury?

enter answer here...

#31. Why are metals malleable?

Because metal ions constantly break and reform their bonds, allowing the shape to be moulded

Because metal atoms themselves are compressible and are moulded into shape

Because the layers of metal slide across each other, rather than breaking the bonds between ions

#32. What is the chemical symbol for iodine?

enter answer here...

#33. 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

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

Select all that apply:

MgSO₄ (aq)

MgS₂

H₂O (l)

HO (l)

MgS (g)

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

#35. In which sub-cellular structure inside plant cells does photosynthesis occur?

enter answer here...

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

1/1840

1

2

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

Select all that apply:

oxygen

water

salt

ozone

carbon dioxide

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

Low

High

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

1

3

2

#40. The table shows 3 substances and their melting points. What common substance in particular could substance Z be?

enter answer here...

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

metals and non-metals

metals and metals

non-metals and non-metals

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

The number of neutrons in its nucleus

The number of protons in its nucleus

The number of electrons in shells surrounding the nucleus

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

Impure

Pure

#44. What is the chemical symbol for sulfur?

enter answer here...

#45. What is the chemical symbol for iron?

enter answer here...

#46. What is the chemical symbol for helium?

enter answer here...

#47. Can Rf values be higher than 1?

Under certain conditions

No

Yes

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

Select all that apply:

KCl

ClOH

H₂

O

H₂O

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

Select all that apply:

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

atoms cannot be created or destroyed

atoms cannot be broken down into smaller parts

all matter is made up of tiny spheres called atoms

atoms can be created and destroyed

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

Endothermic

Exothermic

#51. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

Select all that apply:

Leaves retract inside stems overnight - avoiding water loss

Leaves have stomata - for gaseous exchange

Large leaves - bigger surface area

Flat leaves - reduces distance for diffusion of gases

Root hair cells are thin and very numerous - increasing surface area

Remember to carefully read the question, if you selected Root hair cells, you were mistaken because the question asked about leaves, not roots.

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

False

True

#53. 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

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

melting

evaporation/boiling

condensation

sublimation

deposition

freezing

#55. Which type of reaction transfers energy to the surroundings?

Endothermic

Exothermic

Mesothermic

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

Atomic weight

Relative formula mass

Molecular molar mass

#57. What is the chemical symbol for gold?

enter answer here...

#58. H₂SO₄(aq) + Na₂O(s) → .... + ....

Select all that apply:

MgOH

Na₂SO₄(aq)

NaOH

H₂O (l)

2H₂O (l)

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

Protons

Electrons

Neutrons

Alpha particles

#60. Which scientist proposed the Plumb Pudding Model?

JJ. Thomson

Ernest Rutherford

John Dalton

#61. During Ernest Rutherford's experiments with gold foil, why did some of the particles bounce back?

Alpha particles behave in unpredictable ways and can randomly change direction due to quantum effects

He fired electrons at the gold foil and when they met protons they were reflected back

Alpha particles are positively charged, they were deflected when the met the positively charged protons in the nucleus

#62. Why does diamond not conduct electricity?

Because it has a very high resistance

Because it has no delocalised electrons

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

enter answer here...

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

evaporation/boiling

melting

deposition

condensation

freezing

sublimation

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

yes

no

not sure

#66. Which of these best describes metallic bonding?

Metal atoms lose their electrons to a delocalised pool and all of the metal ions are mutually attracted to the delocalised pool, holding all of the ions together.

Metal atoms lose their electrons to non-metal atoms which then creates positive and negative ions which are attracted by electrostatic attraction.

Metal atoms share their electrons in order to fill their electron shells, this causes an attraction between the positive nuclei and shared electrons.

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

enter answer here...

#68. What is the name of the force that holds together ions in ionic compounds?

weak nuclear force

gravity

strong nuclear force

electrostatic force

#69. 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

#70. Which description best describes an element?

contains only one type of atom

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

contains more than one type of atoms, chemically bonded together

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

the paper

the ink

the solvent

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

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

freezing

evaporation/boiling

sublimation

condensation

deposition

melting

#74. Filtration and crystallisation are used to separate which types of materials?

separating soluble compounds

separate soluble materials from insoluble materials

separate different types of liquids

#75. Which description best describes a compound?

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

contains more than one type of atoms, chemically bonded together

contains only one type of atom

#76. Which type of reaction is aerobic respiration?

Exothermic

Ectothermic

Endothermic

Mesothermic

#77. What is the molecular formula for glucose?

CH₄

C₆H₁₂O₆

CO₆

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

3

2

1

#79. 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.

enter answer here...

#80. Are gases fluids?

Yes

No

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

High density

Low density

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

No

Yes

#83. 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

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

Select all that apply:

compound

element

mixture

#85. 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

#86. Which of the following describe the composition of a pure substance?

Select all that apply:

is the same in all parts of the substance

is the not the same in all parts of the substance

#87. What is the formula for sodium hydroxide?

HCL

H₂SO₄

Ca(OH)₂

NaOH

HNO₃

KOH

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

carbonate ions

hydroxide ions

sulfate ions

hydrogen ions

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

Pure

Impure

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

Select all that apply:

Concentration of dissolved oxygen in the soil

Concentration of atmospheric carbon dioxide

Amount of chloroplasts in cells

Light intensity

Air temperature

Availability of nitrogen in the soil

Concentration of atmospheric nitrogen

GCSE OCR Chemistry Papers 1 and 3

Good Luck!

Results

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

#2. A soluble base is called?

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

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

#5. Determine the empirical formula for Cyclopentane - C₅H₁₀?

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

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

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

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

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

#11. What is the boiling temperature of water?

#12. What is the formula for calcium hydroxide?

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

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

#15. What is the chemical symbol for nitrogen?

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

#17. Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

#18. What is the charge of a neutron?

#19. Determine the empirical formula of glucose - C₆H₁₂O₆.

#20. What type of substance is the air?

#21. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

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

#23. What are ions?

#24. What is the freezing point of water?

#25. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

#26. What is the chemical symbol for magnesium?

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

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

#29. Solutions of pH 7 are?

#30. What is the chemical symbol for mercury?

#31. Why are metals malleable?

#32. What is the chemical symbol for iodine?

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

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

#35. In which sub-cellular structure inside plant cells does photosynthesis occur?

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

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

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

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

#40. The table shows 3 substances and their melting points. What common substance in particular could substance Z be?

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

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

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

#44. What is the chemical symbol for sulfur?

#45. What is the chemical symbol for iron?

#46. What is the chemical symbol for helium?

#47. Can Rf values be higher than 1?

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

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

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

#51. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

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

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

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

#55. Which type of reaction transfers energy to the surroundings?

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

#57. What is the chemical symbol for gold?

#58. H₂SO₄(aq) + Na₂O(s) → .... + ....

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

#60. Which scientist proposed the Plumb Pudding Model?

#61. During Ernest Rutherford's experiments with gold foil, why did some of the particles bounce back?

#62. Why does diamond not conduct electricity?

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

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

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

#66. Which of these best describes metallic bonding?

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

#68. What is the name of the force that holds together ions in ionic compounds?

#69. What do we use fullerenes for?

#70. Which description best describes an element?

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

#72. Which of these descriptions best describes fullerenes?

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

#74. Filtration and crystallisation are used to separate which types of materials?

#75. Which description best describes a compound?

#76. Which type of reaction is aerobic respiration?

#77. What is the molecular formula for glucose?