XMS SEC 3 WA1 2023 QP

3 6092/Chemistry/2023 Term 1 Weighted Assessment Section A Answer all questions. Write your answers in the boxes provided at the end of the Section. 1 Which diagram shows diffusion? A B C D 2 The fluoride ion is added to toothpaste to prevent tooth decay. It has the symbol shown. A student makes two statements about this ion. Statement 1: It contains more electrons than protons. Statement 2: It contains more neutrons than protons. Which statements is/are correct? A 1 only B 2 only C both 1 and 2 D neither 1 nor 2

4 6092/Chemistry/2023 Term 1 Weighted Assessment 3 Substance L melts at –7 C and is a brown liquid at room temperature (25 C). Which value could be the boiling point of L? A –77 C B 0 C C 7 C D 59 C 4 The apparatus shown is set up. Molecules of ammonia and hydrogen chloride react to form ammonium chloride. After 20 minutes, a white ring of ammonium chloride is seen at position Y. Which statement best explains this observation? A Molecules in ammonia diffuse more slowly because they have a larger mass than molecules of hydrogen chloride. B Molecules in ammonia diffuse more quickly because they have a larger mass than molecules of hydrogen chloride. C Molecules in ammonia diffuse more slowly because they have a smaller mass than molecules of hydrogen chloride. D Molecules in ammonia diffuse more quickly because they have a smaller mass than molecules of hydrogen chloride.

5 6092/Chemistry/2023 Term 1 Weighted Assessment 5 Rubidium is in Group 1 of the Periodic Table and bromine is in Group 17. Rubidium reacts with bromine to form an ionic compound. What is the electron transfer taking place for rubidium, and the symbol of the rubidium ion? electron transfer symbol of ion formed A electron gained B electron gained C electron lost D electron lost Question 1 2 3 4 5 Answer

6 6092/Chemistry/2023 Term 1 Weighted Assessment For Examiner’s Use Section B Answer all questions. Write your answers in the spaces provided. 6 The diagram shows the nuclei of five different atoms. (a) Which atom has a proton (atomic) number of 3? …………………………………………………………………………………………… [1] (b) Which atom has a nucleon (mass) number of 12? …………………………………………………………………………………………… [1] (c) Which two atoms are isotopes of the same element? …………………………………………………………………………………………… [1] (d) Write the electronic arrangement of atom E. …………………………………………………………………………………………… [1] [Total: 4]

7 6092/Chemistry/2023 Term 1 Weighted Assessment For Examiner’s Use 7 The table shows the percentage s by mass of the elements in the Earth’s crust and in the oceans. element percentage by mass in the Earth’s crust percentage by mass in the oceans aluminium 8.20 0.00 calcium 3.60 0.05 chlorine 0.05 1.80 hydrogen 0.22 11.00 iron 5.00 0.00 oxygen 46.60 85.80