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0 1 This question is about halogens and their compounds. Table 1 shows the boiling points and properties of some of the elements in Group 7 of the periodic table. Table 1 Element Boiling point in ° C Colour in aqueous solution Fluorine -188 colourless Chlorine -35 pale green Bromine X orange Iodine 184 brown 0 1 . 1 Why does iodine have a higher boiling point than chlorine? [1 mark] Tick one box. Iodine is ionic and chlorine is covalent Iodine is less reactive than chlorine ...

Question Answers Extra information Mark AO / Spec. Ref 01.1 The forces between iodine molecules are stronger 1 AO1/1 4.2.2.4 AO1 01.2 anything in range +30 to +120 1 AO3/2a 4.1.2.6 01.3 Brown 1 AO2/1 4.1.2.6 01.4 2 I− + Cl2 → I2 + 2 Cl− 1 AO2 /1 4.1.2.6 4.1.1.1 01.5 It contains ions which can move 1 AO1/1 4.2.2.3 01.6 hydrogen iodine 1 AO2/1 4.4.3.4 Total 6. Question 2 Question Answers Extra information Mark AO / Spec. Ref. 02.1 13 (protons) 14 (neutrons) 13 (e...

0 1 This question is about the periodic table. In the 19th century, some scientists tried to classify the elements by arranging them in order of their atomic weights. Figure 1 shows the periodic table Mendeleev produced in 1869. His periodic table was more widely accepted than previous versions . 1 The atomic weight of tellurium (Te) is 128 and that of iodine (I) is 127 Why did Mendeleev reverse the order of these two elements?

Question Answers Extra information Mark AO / Spec. Ref 01.1 any one from: • so elements / iodine / tellurium were in groups with similar properties • iodine has similar properties to Br / Cl / F / Group 7 • iodine has different properties to Se / S / O / Group 6 ignore reference to atomic structure ignore references to Cr, Mn and Mo allow corresponding argument in terms of tellurium 1 AO1 4.1.2.2 01.2 Mendeleev had predicted properties of missing elements ...

1 Soluble salts are formed by reacting metal oxides with acids. box 0 1 . 1 Give one other type of substance that can react with an acid to form a soluble salt. [1 mark] 0 1 . 2 Calcium nitrate contains the ions Ca2+ and NO3 – Give the formula of calcium nitrate. [1 mark] 0 1 . 3 Describe a method to make pure, dry crystals of magnesium sulfate from a metal oxide and a dilute acid. 0 2 This question is about metals and metal compounds. box 0 2 . 1 Iron pyrites is an ionic compound....

GCSE Chemistry 8462/1H – PAPER 1 – HIGHER TIER Mark scheme 01.1 any one from: • metal • (metal) hydroxide • (metal) carbonate • alkali allow named example allow correct formula ignore base allow ammonium hydroxide allow ammonium carbonate allow soluble base allow ammonia 1 AO1 4.4.2.1 4.4.2.2 4.4.2.3 01.2 Ca(NO3)2 allow Ca2+(NO3 - ) 2 1 AO2 4.4.2.2

0 1 Figure 1 shows part of a DNA molecule 0 1 . 1 How many nucleotides are shown in Figure 1? [1 mark] 0 1 . 2 Name the type of bond labelled X in Figure 1 0 1 . 3 The enzymes DNA helicase and DNA polymerase are involved in DNA replication. Describe the function of each of these enzymes. [2 marks] DNA helicase DNA polymerase 0 1 . 4 Adenosine triphosphate (ATP) is a nucleotide derivative. Contrast the structures of ATP and a nucleotide found in DNA to give two differences.

Table 1 shows features of a bacterium and the human immunodeficiency virus (HIV) particle. Complete Table 1 by putting a tick () where a feature is present. [2 marks] Table 1 Feature Bacterium Human immunodeficiency virus (HIV) particle RNA Cell wall Enzyme molecules Capsid 0 1 . 2 When HIV infects a human cell, the following events occur. • A single-stranded length of HIV DNA is made. • The human cell then makes a complementary strand to the HIV DNA. The complementa...

Mark scheme instructions to examiners 1. General The mark scheme for each question shows: • the marks available for each part of the question • the total marks available for the question • the typical answer or answers which are expected • extra information to help the examiner make his or her judgement and help to delineate what is acceptable or not worthy of credit or, in discursive answers, to give an overview of the area in which a mark or marks may be awarded. The ...