Pre GCSE assessment 1 practice questions Chemistry

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1 Pre GCSE assessment practice questions Chemistry High Storrs School Q.Magnesium burns in oxygen. By Kingsway School [CC BY 2.0],via Flickr Use the Chemistry Data Sheet to help you to answer this question. The word equation for magnesium burning is: magnesium + oxygen magnesium oxide Draw one line from each substance to its correct description. Substance Description compound magnesium metal magnesium oxide mixture oxygen non-metal (3) Page

2 The diagram represents a magnesium atom. Complete the table to show the name of each particle and the charge of each particle in the magnesium atom. Name of particle Charge proton + neutron (2) c) Use the Chemistry Data Sheet to help you to answer these questions. Draw a ring around the correct answer to complete each sentence. (i) In a magnesium atom, the protons and neutrons are in the core. nucleus. shell. () atomic number (ii) The number of protons in a magnesium atom is the mass number. group number. () Page 2

3 (iii) atomic number. The sum of the protons and neutrons in a magnesium atom is the mass number. group number. () (Total 8 marks) Q2. The diagram shows part of the periodic table. Choose from the elements shown in the table: one metal... a noble gas... () () (c) a coloured gas... () (Total 3 marks) Page 3

4 Q3 High Storrs School Sando-K is a medicine. It is given to people whose bodies contain too little of a particular element. Sando-K is a mixture of two compounds. The formulae of the two compounds are given below. KHCO3 KCl Use the Data Sheet to help you to name all the elements in these compounds. (3) Which metal do people given Sando-K need? () (Total 4 marks) Q4. There are millions of different substances that make up our world. All these substances are made from chemical elements. What is an element? () Many substances are compounds. What is a compound? (2) (Total 3 marks) Page 4

5 Q5. The graph shows the melting point of four elements in Group 7 of the periodic table. What is the melting point of fluorine? () Room temperature is 20 C. Which element is solid at room temperature? () (c) Look at the periodic table on the Data Sheet. Using data from the graph, describe the trend of melting points of the elements in Group 7. (2) Page 5

6 (d) The elements in Group 7 are non-metals. Which two of the following are properties of non-metals? Place a tick ( ) in the box against each correct property. Brittle (if solid) Good conductor of heat High boiling point Poor conductor of electricity (2) (Total 6 marks) Q6. Use the periodic table on the Data Sheet to answer these questions. The table below gives the electronic structures of four elements, W, X, Y and Z. Element Electronic structure W 2,5 X 2,7 Y 2,8,8 Z 2,8,8, Which element W, X, Y or Z: (i) is a Group 0 gas?... (ii) is nitrogen?... (iii) is a Group 7 gas?... (iv) reacts violently with water?... (3) Which two Groups of the periodic table do not contain any non-metals? () (Total 4 marks) Page 6

7 M High Storrs School. one mark for each substance linked correctly to its description do not accept more than one line from each substance 3 0 / zero / none / no charge electron (c) (i) nucleus (ii) atomic number (iii) mass number [8] M2. sodium / magnesium / aluminium (Allow correct symbols) for mark argon (Allow correct symbols) for mark (c) chlorine (Allow correct symbols) for mark [3] Page 7

8 M3 High Storrs School potassium, hydrogen, carbon, oxygen, chlorine or iodine 3 correct gains mark 4 correct gains 2 marks all correct gains 3 marks (deduct mark for each incorrect answer) 3 potassium (K) for mark [4] M4. a substance which contains one type of atom or a substance that cannot be broken down into anything simpler for mark more than one element/more than one type of atom combined/join together/bonded for mark each 2 [3] M5. 220( C) accept without unit do not credit if no minus sign no tolerance allowed iodine allow I or I2 (c) increase down (the groups) N.B. must be one comparative or superlative for either position in group or melting point to obtain 2 marks e.g. accept lowest in group has highest melting point for 2 marks, accept highest in group has lowest melting point for 2 marks Page 8

9 accept highest mass numbers or proton numbers or atomic numbers have highest melting point for 2 marks allow F has lower or lowest melting point for mark allow Increase from F to, i.e. referring to graph rather than periodic table for mark F has a low melting point no marks 2 (d) brittle poor conductor of electricity maximum mark if three boxes ticked no marks if all four boxes ticked [6] M6. (i) Y or 2,8,8 or Argon or Ar All correct gains 3 marks (ii) W or 2,5 3 correct gains mark (iii) X or 2,7 or fluorine or F 2 or correct gains mark (iv) Z or 2,8,8, or potassium or K N.B. number of ticks on script must equal number of marks 3 b) and 2 (both needed) do not credit if any other group listed transition metals neutral allow alkali metals and alkali earth metals [4] Page 9

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