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Q1— Section header —
1.1Give suitable name or term for each of the following descriptions
1.1.1An atom that tends to form bonds until it is surrounded by eight valence electrons
1.1.2The distance between two atomic nuclei where energy is lowest and the bond develop
1.1.3When the valence orbitals of atoms overlap and they share an electron pair between the nuclei
1.1.4The arrangement in space of the covalent bonds in multiple covalent which is related to the number of the electrons in their valency shell
1.1.5Occurs when the atom with the higher electronegativity exerts a stronger attraction on the shared electrons pair than the other atom (5 2\ (10\
1.2Differ entiate between polar and non polar molecules and give ONE example of
1.3The following substances are provided: MgO He Zn
1.3.5\the ANSWER BOOK.
1.3.1An e lectrovalent compound
1.3.2A n oble gas
1.3.3Metallic bonds
1.3.4A c ovalent compound
1.3.5Van Der Waal's forces (5 1\ (5\
1.4Name the first FOUR types of energy that occur during the production of sodium chloride. (4\ [25]25
Q2— Section header —
2.1Answer the following questions on the chemical compound with the formula CH
2.1.1Write down the general formula for this compound. (2\
2.1.2Name this compound. (2\
2.1.3Draw a Lewis structure for this compound. (3\
2.1.4What is the shape of CH molecule? (1\
2.1.5How many bonding pair does CH molecule have? (1\
2.1.6Does this compound obey the Octet rule? Motivate your answer. (2\
2.1.7Is this compound a polar or nonpolar molecule? (1\
2.1.8How many valence electrons does CH molecule have? (1\
2.2Given: HNO 3 (aq\ + H (l\
2.2.1Give a suitable chemical name of H (1\
2.2.2Is H O an ionic, covalent or an interstitional hydride? (1\
2.2.3Explain why HNO is regarded as an Arrhenius acid in the above reaction? (2\
2.2.4Write down the K for this expression. (3\
2.2.5Is K big or small? Explain your answer. (2\
2.2.6Indicate the conjugate acid base pairs. (2\
2.2.7etween HNO and HNO which acid is strongest (1\
Q3— Section header —
3.1Oxygen can be prepared by the thermal decomposition of lead oxide. Write down the balance reaction. (3\
3.2Briefly explain why ozone is thermodynamically unstable as compared to the oxygen. (2\
3.3Draw TWO line structure of the ozone. (2\ 15040004
3.4Give ONE example of each of the following oxides:
3.4.1Normal oxide
3.4.2Mixed oxide
3.4.3eroxide
3.4.4uboxide (4 1\ (4\
3.5Ammonia (NH \is prepared in the laboratory by reacting calcium hydroxide and ammonium chloride. Write down the balanced chemical reaction. (5\
3.6Give TWO properties of the ammonia. (2\
3.7Give THREE ways of producing hydrogen in the laboratory. (3\
3.8Complete the following reaction:
3.8.14NH + 5O
3.8.22NO + H (2 2\ (4\
Q4— Section header —
4.1Name FOUR proces ses of the carbon cycle in nature. (4\
4.2Give THREE uses of carbon black. (3\
4.3Write down the balance reaction of carbon with calcium. (3\
4.4Give the correct hydride/carbide of each of the following:
4.4.1Mn
4.4.3ZrH
4.4.4SiC
4.4.5CaC (5 1\ (5\ 15040004
4.5Name TWO substances that can be used when we prepare carbon tetrachloride (CCl (2\
4.6Give the suitable chemical name of each of the following:
4.6.1HNO
4.6.3(3 1\ (3\
4.7Graphite is manufactured by the A cheson process in industry. Write down the balanced chemical reaction. (5\ [25] TOTAL: 10025