INTERNATIONAL GCSE CHEMISTRY Paper 2 Wednesday 10 November 2021

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Answer all questions in the spaces provided. box 0 1 This question is about atoms. 0 1 . 1 The atomic model has developed over time. Figure 1 shows two different models of an atom of the same eleme... nt. Figure 1 Give four differences between Model A and Model B. [4 marks] 1 2 3 4 0 1 . 2 What is the total number of atoms in a molecule of NH3? [1 mark] Tick () one box. 2 3 4 53 *03* Turn over ► IB/M/Nov21/9202/2 Do not write outside the An atom of chlorine is represented as 17 35Cl box 0 1 . 3 Give the number of protons, the number of electrons and the number of neutrons in one atom of 17 35Cl [3 marks] Number of protons Number of electrons Number of neutrons 0 1 . 4 Chlorine has two isotopes. Complete the sentence. Choose the answer from the box. [1 mark] electrons neutrons protons Isotopes are atoms of the same element with a different number of . Turn over for the next question 94 *04* IB/M/Nov21/9202/2 Do not write outside the 0 2 This question is about states of matter. box 0 2 . 1 Figure 2 represents particles of argon in the liquid state. Figure 2 Complete the box below to represent particles of argon in the gaseous state. [1 mark] 0 2 . 2 The melting point of argon is −189 °C. The boiling point of argon is −186 °C. Complete the sentence. [1 mark] The change of state when argon is warmed from −190 °C to −187 °C is from to .5 *05* Turn over ► IB/M/Nov21/9202/2 Do not write outside the A teacher demonstrated an experiment using bromine gas and air. box Figure 3 shows the apparatus. Figure 3 When the glass plate was removed the brown bromine gas moved up into the top container. 0 2 . 3 Name the process that occurred when the glass plate was removed. [1 mark] 0 2 . 4 The teacher repeats the experiment at a higher temperatur [Show More]

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