Q1. The structures of four substances, A, B, C and D, are represented in Figure 1.
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1 Q. The structures of four substances, A, B, C and D, are represented in Figure. (a) Use the correct letter, A, B, C or D, to answer each question. (i) Which substance is a gas? () Which substance is a liquid? () (iii) Which substance is an element? () (iv) Which substance is made of ions? () (b) Figure 2 shows the bonding in substance C. (i) What is the formula of substance C? Draw a ring around the correct answer. SO 2 SO 2 S 2 O () Page of 0
2 Use the correct answer from the box to complete the sentence. delocalised shared transferred When a sulfur atom and an oxygen atom bond to produce substance C, electrons are... () (iii) What is the type of bonding in substance C? Draw a ring around the correct answer. covalent ionic metallic () (Total 7 marks) Q2. (a) Figure shows an atom of element G. Figure Draw a ring around the correct answer to complete each sentence. (i) Label A shows an electron an ion a nucleus () The particle labelled B is an isotope a molecule a neutron () (iii) The mass number of element G is 5 6 () (iv) Use the periodic table to identify element G. Element G is boron carbon sodium () Page 2 of 0
3 (b) Figure 2 shows a compound of G and hydrogen. Figure 2 Draw a ring around the correct answer to complete each sentence. (i) The formula of the compound in Figure 2 is GH 3 G 3 H 3HG () The type of bonding shown in Figure 2 is covalent ionic metallic () (Total 6 marks) Q3. The diagram represents a magnesium atom. (a) Use words from the box to answer these questions. electron neutron nucleus proton (i) What is the name of the central part of the atom?... What is the name of the particle with no charge?... (iii) What is the name of the particle with a negative charge?... () () () Page 3 of 0
4 (b) Use the diagram above to help you answer these questions. (i) Draw a ring around the atomic (proton) number of this magnesium atom () Draw a ring around the mass number of this magnesium atom () (c) The diagram shows how magnesium and iodine atoms form magnesium iodide. Only the outer electrons are shown. The dots ( ) and crosses ( ) are used to represent electrons. Use the diagram to help you to answer this question. Page 4 of 0
5 Describe, as fully as you can, what happens when magnesium reacts with iodine to make magnesium iodide. To gain full marks you should use the words atom, electron and ion in your answer. (4) (Total 9 marks) Q4. High quality connectors are used to connect a satellite box to a television. The connectors should conduct electricity very well and should not corrode. By Alphathon (Own work) [CC-BY-SA-3.0 or GFDL], via Wikimedia Commons The connectors on this scart lead are coated with gold. (a) Gold is a typical metal. (i) Describe the structure and bonding of gold. (3) Page 5 of 0
6 Why is gold a good conductor of electricity? () (b) The surface of some metals, such as iron, corrode when exposed to the air. Suggest why this reduces the electrical conductivity of the metal. (2) (Total 6 marks) Page 6 of 0
7 (b) (i) SO 2 (b) (i) GH 3 M. (a) (i) C (iii) (iv) B A D shared (iii) covalent [7] M2. (a) (i) an electron a neutron (iii) (iv) boron covalent [6] M3. (a) (i) nucleus (iii) neutron electron (b) (i) 2 24 Page 7 of 0
8 (c) any four from: sharing / covalent / metallic = max 3 magnesium (atom) reacts with two iodine (atoms) magnesium (atom) loses electrons 2 electrons (from each atom) Iodine (atom) gains electron(s) electron or an electron (to each atom) iodide ion formed allow iodine ion iodide has negative charge / is a negative ion / particle allow iodine ignore I 2 magnesium ion formed magnesium has positive charge oppositely charged ions attract a giant structure / lattice is formed allow mark for unqualified reference to ion formation or ionic bonding 4 [9] M4. (a) (i) mention of molecules or any reference to incorrect bonding = max 2 giant structure / lattice or particles arranged in a regular pattern allow close packed / layers sea of electrons / delocalised electrons allow free electrons positive ions and electrons attract each other ignore metallic bonds appropriately labelled diagrams can gain first two marks (sea of) electrons can move through the structure allow free / roaming / mobile electrons or delocalised electrons (b) (metal) oxide / ionic compound formed Page 8 of 0
9 ions not free to move or electrons cannot move through the structure allow no / fewer delocalised / free / roaming / mobile electrons [6] Page 9 of 0
10 Page 0 of 0
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