OCR Combined Science A Papers 3 and 9 Automock

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

The number of electrons in shells surrounding the nucleus

The number of neutrons in its nucleus

The number of protons in its nucleus

#2. 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.

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

C₂H₂O

CHO₂

C₂OH

CH₂O

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

Select all that apply:

salt

oxygen

electrons

hydrogen

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

hydroxide ions

carbonate ions

hydrogen ions

sulfate ions

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

High

Low

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

separate different types of liquids

separate soluble materials from insoluble materials

separating soluble compounds

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

Zn

ZnO

e

2e

#9. Which of the following was the Rutherford Model of atomic structure?

A central nucleus containing protons and neutrons, surrounded by electrons

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

#10. Are metals usually good conductors of electricity?

No

Yes

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

SO₄²⁻

CO₃²⁻

OH⁻

NH₄⁺

SO₃²⁻

NO₃⁻

#12. Which description best describes an element?

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

contains only one type of atom

contains more than one type of atoms, chemically bonded together

#13. Solutions of more than pH 7 are?

alkaline

neutral

acidic

#14. Do metals usually have a high or low melting point?

High

Low

#15. What is the chemical symbol for radium?

#16. Complete the equation: H⁺(aq) + OH⁻(aq) → ….

H₂O(l)

CO₂(g)

OH₂(aq)

2H₂O(l)

Remember:

acids produce an excess of hydrogen ions

alkalis produce an excess of hydroxide ions

hydrogen ions and hydroxide ions come together to make water which is neutral.

#17. Solutions of pH 7 are?

alkaline

neutral

acidic

#18. What is the chemical symbol for copper?

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

Aᵣ

Mᵣ

Hᵣ

MAᵣ

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

Endothermic

Exothermic

#21. H₂SO₄(aq) + Na₂O(s) → …. + ….

Select all that apply:

2H₂O (l)

Na₂SO₄(aq)

H₂O (l)

MgOH

NaOH

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

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

#24. Which of the following descriptions matches the term empirical 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

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

2,7

2,5

2,8,5

#26. 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

#27. What is the difference in concentration between pH 6 and pH 4?

10,000x

100x

1000x

10x

1x

#28. What is the chemical symbol for iodine?

#29. What is the chemical symbol for gold?

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

water

salt

rocks

sand

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

dull

shiny

#32. Which description best describes a compound?

contains more than one type of atoms, chemically bonded together

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

contains only one type of atom

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

Electrical, Direct

Electrical, Alternating

Thermal, Indirect

Thermal, Direct

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

High density

Low density

#35. Fractional distillation is used to separate which types of materials?

separating soluble compounds

separate soluble materials from insoluble materials

separate different types of liquids

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

Is the sum of the relative atomic masses

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

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

#37. Which type of reaction takes in energy, making the surroundings cooler?

Exothermic

Ectothermic

Endothermic

#38. What is the chemical symbol for iron?

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

plasma

gases

solids

liquids

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

non-metal and non-metal

metal and non-metal

metal and metal

#41. 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

#42. 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.

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

The most reactive ions

The least reactive ions

#43. What is the freezing point of water?

66.5˚C

25˚C

55˚C

30˚C

100˚C

0˚C

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

in the nucleus

orbiting the nucleus in the electrons

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

chloride

sulfate

carbonate

nitrate

borate

#46. Which of the following are strong acids?

Select all that apply:

sulfuric acid

hydrochloric acid

carbonic acid

boric acid

nitric acid

ethanoic acid

#47. What is the chemical symbol for radon?

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

True

False

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

demicronation

desalination

unsaturation

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

Endothermic

Mesothermic

Exothermic

#51. Which description most accurately describes covalent bonding

electrons are transferred between atoms

electrons are shared between atoms

#52. 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: Sodium (Na) Anode: Hydroxide (OH⁻)

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

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

1

1/1840

2

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

ionically

metallically

covalently

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

gases

liquids

Bose-Einstein Condensates

solids

#56. What is the chemical symbol for chlorine?

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

All materials made of carbon have a high melting point, that is why carbon is added to iron to make steel.

Many strong covalent bonds need to be broken in order to melt the solid forms of diamond and graphite.

#58. Can Rf values be higher than 1?

Yes

Under certain conditions

No

#59. 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

#60. 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.

GCSE OCR Combined Science A Papers 3 and 9

Results

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

#2. Why is diamond hard?

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

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

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

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

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

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

#9. Which of the following was the Rutherford Model of atomic structure?

#10. Are metals usually good conductors of electricity?

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

#12. Which description best describes an element?

#13. Solutions of more than pH 7 are?

#14. Do metals usually have a high or low melting point?

#15. What is the chemical symbol for radium?

#16. Complete the equation: H⁺(aq) + OH⁻(aq) → ….

#17. Solutions of pH 7 are?

#18. What is the chemical symbol for copper?

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

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

#21. H₂SO₄(aq) + Na₂O(s) → …. + ….

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

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

#24. Which of the following descriptions matches the term empirical formula?

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

#26. Why is graphite softer than diamond?

#27. What is the difference in concentration between pH 6 and pH 4?

#28. What is the chemical symbol for iodine?

#29. What is the chemical symbol for gold?

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

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

#32. Which description best describes a compound?

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

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

#35. Fractional distillation is used to separate which types of materials?

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

#37. Which type of reaction takes in energy, making the surroundings cooler?

#38. What is the chemical symbol for iron?

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

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

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

#42. 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.

#43. What is the freezing point of water?

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

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

#46. Which of the following are strong acids?

#47. What is the chemical symbol for radon?

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

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

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

#51. Which description most accurately describes covalent bonding

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

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

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

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

#56. What is the chemical symbol for chlorine?

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

#58. Can Rf values be higher than 1?

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

#60. 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.

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