Q1. (a) An atom of aluminium can be represented as shown below. In this atom of aluminium the number of protons is... and

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1 Q. (a) An atom of aluminium can be represented as shown below. In this atom of aluminium the number of protons is... and the number of neutrons is... (2) Which statement in the table below describes the mass of an electron? Tick ( ) one box. Statement Tick ( ) Electrons have a very small mass compared to protons. Electrons have about the same mass as protons. Electrons are much heavier than protons. Electrons have about the same mass as neutrons. () (c) Which method is used to extract aluminium from aluminium oxide? Tick ( ) one box. Method Tick ( ) Heating aluminium oxide. Heating aluminium oxide with carbon. Electrolysis of molten aluminium oxide. Heating aluminium oxide with copper. () (Total 4 marks) Page

2 Q2. Hot air balloons burn hydrocarbons to heat the air. (a) The hot air contains these gases: nitrogen, N 2 oxygen, O 2 argon, Ar carbon dioxide, CO 2 water vapour, H 2O (i) Argon is an element. What is an element? () (ii) Name one other gas in the hot air that is also an element.... () Propane, C 3H 8, can be represented as: H H H H C C Page 2 C H

3 H H H Use the correct words from the box to complete the sentences. bond carbon compound element mixture (i) Propane is a... and is made up of atoms of hydrogen and... (2) (ii) Each line between the atoms in propane represents a chemical... () (Total 5 marks) Q3. Lithium is a very reactive metal. (a) Lithium reacts with cold water. (i) Which physical property of lithium is seen during this reaction?... () Page 3

4 (ii) Which chemical property of lithium will be shown by the universal indicator?... () Complete the sentence by writing in the missing numbers. Lithium has an atomic number of 3 and a mass number of 7. This means that an atom of lithium has... protons... electrons and... neutrons. (3) (Total 5 marks) Q4. (a) Write down the symbols for lithium... fluorine... (2) The electronic structure of a lithium atom can be shown like this: In a similar way, complete this diagram to show the electronic structure of a fluorine atom. () Page 4

5 (c) A lithium atom can lose one electron to form a lithium ion which can be written (2) + A fluorine atom can gain one electron to form a fluoride ion. Choose from the list the correct way to write the fluoride ion. (2,6) + (2,7) + (2,7) - (2,8) + (2,8) Answer... (2) (Total 5 marks) Q5. (a) The list below gives six substances. aluminium beer copper milk pure water sodium chloride Put each substance in the correct column of the table. ELEMENTS COMPOUNDS MIXTURES (3) Elements can be divided into two groups, metals and non-metals. The list below gives some properties of elements. brittle can be hammered into shape dull Page 5

6 good conductors of electricity poor conductors of electricity shiny Put each property into the correct column. PROPERTIES OF METALS PROPERTIES OF NON-METALS (3) (Total 6 marks) Page 6

7 M. (a) 3 4 numbers must be in the order shown electrons have a very small mass compared to protons (c) electrolysis of molten aluminium oxide [4] M2. (a) (i) made up of one sort of atom accept it is in the periodic table or has its own symbol (ii) nitrogen / N / N 2 or oxygen / O / O 2 do not accept argon or helium do not accept oxide (i) compound carbon (ii) bond [5] Page 7

8 M3. (a) (i) low density accept floats (on water) (ii) forms an alkaline solution with water accept alkali (metal) or basic do not accept group metal 3 or three (protons) 3 or three (electrons) 4 or four (neutrons) [5] M4. (a) lithium = Li (ignore mass / atomic numbers) fluorine = F (do not allow if case is incorrect) for mark each 2 (allow or o for electrons) (allow any positions for the seven electrons added provided they are on the outer ring) for mark (c) (2,8) + or (2,7) (brackets not required) gains mark but (2,8) gains 2 marks 2 [5] Page 8

9 ## (a) elements: aluminium, copper, compounds: pure water, sodium chloride, mixture: beer, milk 2/3 correct gains mark 4/5 correct gains 2 marks all correct gains 3 marks 3 metals: can be hammered into shape, good conductor of electricity, shiny non metals: brittle, dull, poor conductors of electricity 2/3 correct gains mark 4/5 correct gains 2 marks all correct gains 3 marks 3 [6] Page 9

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