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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 AO1/101.2 anything in range +30 to +120 1 6 01.3 Brown 1 AO2/1 01.4 2 I− + Cl2 → I2 + 2 Cl− 1 AO2 /1 01.5 It contains ions which can move 1 AO1/14.2.2.3 01.6 hydrogen iodine 1 AO2/14.4.3.4 Total 6 Question 2 Question Answers Extra information Mark AO / Spec. Ref. 02.1 13 (protons) 14 (neutrons) 13 (electrons) The answers must be in the correct order. if no oth...

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? . 2 Mendeleev left spaces marked with an asterisk * He left...

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 element...

GCSE CHEMISTRYHigher Tier Paper 1 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 pyr...

GCSE Chemistry8462/1H – PAPER 1 – HIGHER TIERMark 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

June 2017 QP (v1) Paper 1 AQA Biology AS-level. 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 nucleoti...

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...

Question Marking Guidance Mark Comments 01.1 Feature Bacterium Human immunodeficiency virus (HIV) particle RNA   Cell wall  Enzyme molecules   Capsid  2 1 mark for each correct vertical column 01.2 1. (Complementary) nucleotides/bases pair OR A to T and C to G; 2. DNA polymerase; 3. Nucleotides join together (to form new strand)/phosphodiester bonds form; 3 1. & 3. Ignore ‘(DNA polymerase) forms base pairs/nucleotide pairs’ If clearly writing ...

BIOD 121 Nutrition Exam 1 2 3 4 5 6 Portage Learning M6 Exam Essentials in Nutrition Latest /// Final exam ((biod 121) Exam 1 Nutrition (Portage Learning) Biod 121 exam 4 practice problems BIOD 121: Nutrition EXAM BIOD 121 Portage Learning M3 Exam Essentials in Nutrition Complete with Answers Verified and Graded 2024 Update