MARIYA INTERNATIONAL SCHOOL. Work sheet II. Term I. Level 8 Chemistry [Paper IV] Name: ATOMIC STRUCTURE & BONDING
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1 MARIYA INTERNATIONAL SCHOOL Work sheet II Term I Level 8 Chemistry [Paper IV] Name: ATOMIC STRUCTURE & BONDING 1. Complete the following table. 2. Draw a diagram showing the arrangement of the valence electrons in one molecule of the covalent compound nitrogen trichloride. Use x to represent an electron from a nitrogen atom. Use o to represent an electron from a chlorine atom.
2 3. Draw a diagram to show the arrangement of the valence electrons in one molecule of the covalent compound hydrogen sulphide. Use o to represent an electron from a Sulphur atom. Use x to represent an electron from a hydrogen atom. 4. Calcium and other minerals are essential for healthy teeth and bones. Tablets can be taken to provide these minerals. Boron is a non-metal with a macromolecular structure. i. What is the valency of boron?... ii. Name another element and a compound that have macromolecular structures. Element.. Compound.
3 5. The structures of some substances containing chlorine are shown. a. Answer the following questions about these substances. i. Which substance is a diatomic molecule?... ii. Which substance represents part of an ionic structure?... iii. Which substance is an element? Explain your answer. iv. Determine the simplest formula for substance D.... b. The symbols for two isotopes of chlorine are shown. i. How do these two isotopes differ in their atomic structure?. ii. Determine the number of neutrons present in one atom of the isotope Cl.... iii. Draw the electronic structure of a chlorine atom. Show all shells and all electrons.
4 6. Complete the following table which gives the number of protons, electrons and neutrons in each of the five particles. 7. Draw a diagram showing the arrangement of the valence electrons in one molecule of the covalent compound carbon dioxide. Use x to represent an electron from a carbon atom. Use o to represent an electron from an oxygen atom.
5 8. a) Sodium chloride is an ionic compound. Draw a diagram that shows the formula of the compound, the charges on the ions and gives the arrangement of the valence electrons around the negative ion. Use x to represent an electron from a sodium atom. Use o to represent an electron from a chlorine atom. b) Scandium fluoride is an ionic compound. The valency of scandiumin scandium fluoride is three. Draw a diagram which shows the formula of this compound, the charges on the ions and the arrangement of the valency electrons around the negative ions. The atomic number of Scandium is 21. Use to represent an electron from a fluorine atom. Use to represent an electron from a scandium atom.
6 c) Draw a diagram to show the covalent bonding in one molecule of Nitrogen. 9. There are three types of giant structures ionic, metallic, and macromolecular. a) Sodium nitride is an ionic compound. Draw a diagram that shows the formula of the compound, the charges on the ions and the arrangement of valence electrons around the negative ion. Use x to represent an electron from a sodium atom. Use o to represent an electron from a nitrogen atom. b) i) Describe metallic bonding. ii) Use the above ideas to explain why Metals are good conductors of electricity Metals are malleable..
7 10. The first three elements in Group IV are Carbon, Silicon, Germanium. (a) Unlike diamond, graphite is soft and is a good conductor of electricity. (i) Explain why graphite has these properties. (ii) Give a use of graphite that depends on one of these properties Property Use (b) Carbon dioxide and Silicon (IV) oxide have similar formulae but different type s ofstructure. (i) Give the formulae of these oxides. (ii) How are their structures different? 11. A) Complete the table which gives the names, symbols, relative masses and relativecharges of the three subatomic particles.
8 (B) Use the information in the table to explain the following. (i) Atoms contain charged particles but they are electrically neutral because they have no overall charge. (ii) Atoms can form positive ions. (iii) Atoms of the same element can have different masses. 12. The table below gives the composition of six particles which are either atoms or ions. a) Which particles are atoms? Explain your choice b) Which particle is a negative ion and why has this particle got a negative charge? c) Which particles are positive ions?...
9 d) Explain why particle A and particle D are isotopes This question is about atoms, ions and isotopes. (a) Define the term nucleon number. (b) Give the electronic structure of the following atom and ion. Na... P 3... (c) State one medical use of radioactive isotopes. (d) What is meant by the term relative atomic mass? (e) Suggest why the relative atomic mass of chlorine is not a whole number.
[2]... [1]
![[2]... [1]](/thumbs/75/71765689.jpg "[2]... [1]")
1 Carbon and silicon are elements in Group IV. Both elements have macromolecular structures. (a) Diamond and graphite are two forms of the element carbon. (i) Explain why diamond is a very hard substance....
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