SENIOR TWO CHEMISTRY CLOZE

Gap-fill exercise

44:52
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. The electronic structure of an element X is 2; 8:6
(a) To which Period of the Periodic table does X belong?



(b) To which group of the Periodic Table does X belong?


(b) Element X reacts with an element M (atomic number = 12)
(i) Give the electronic structure of M.

(ii) State the type of bond that exists in the compound between M and X


2. An atom of an element is represented by the symbol
80X
15


(i) State the mass number of the atom


(ii) What is the atomic number of the atom?

(iii) How many neutrons are present in the atom?

3. (a) State the approximate percentage of oxygen in the atmosphere.



(b) Name the process by which oxygen is
(i) used up from the atmosphere.



(i) replaced in the atmosphere.



4. is a substance formed when the ionisable hydrogen atoms of an acid is partially or completely replaced by a metal or ammonium radical.

5. An salt is formed when only part of the ionisable hydrogen atoms of an acid is replaced by a metal or ammonium radical.
6. When preparing a salt one must know whether it is in water
7. A soluble salt is prepared by while an insoluble one is prepared by
8. is a substance that shows the presence of an acid or an alkali.
9. An is an aqueous solution of a soluble base.
10. Iron reacts with steam to form which is a mixed oxide
11. A is an oxide or hydroxide of a metal which reacts with an acid to form a salt and water only.
12. The of an acid is the number of hydrogen ions that can be released by one molecule of an acid on ionization.
13. A acid is one which does not completely ionize in aqueous solutions.
14. An is a substance which when dissolved in water produces hydrogen ions as the only positively charged ions in solution.
15.When metals above hydrogen in the series react with dilute mineral acids, hydrogen gas produced.
16. Nitric acid does not produce hydrogen gas when reacted with metals because it is a strong agent,
17. Acids react with bases to produce and water only.
18. Zinc sulphate is a salt and it is prepared by a method known as .
19. Sodium metal reacts with cold water to produce and hydrogen gas.
20. Which metal is below hydrogen in the reactivity series has its oxide reduced by hydrogen gas?
21. During the laboratory preparation of hydrogen gas, the metals hydrogen from the dilute acids.
22. The apparatus can be used to produce an intermittent supply of hydrogen gas in the laboratory.
23. Hydrogen gas is very light gas. It is therefore collected by delivery.
24. Hydrogen gas reduces black copper (II) oxide to copper metal.
25. Hydrogen gas was used in weather balloons because it is a very gas.
26. Metal atoms become oxidized by losing
27. A reaction in which both oxidation and reduction occur is said to be a reaction.
28. An is the smallest electrically neutral particle of an element.
29. The inner most region of an atom is made up of
30. All atoms contain three fundamental particles except the ordinary atom which contains no .
31. Of the particles in an atom, have no charge while protons are positively charged.
32. Protons and neutrons are collectively called because they are found in the nucleus of an atom.
33. The number of electrons and protons in an atom are equal, that is why an atom is
34. Electrons which are negatively charged move about in around the nucleus.
35. Of the particles in an atom, only protons and have mass.
36. Atomic number of an atom is the number of in the nucleus of an atom of an element.