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Form 2 Chemistry Questions and Answers on Chemical Families
Name one property of neon that makes it possible to be used in electric lamps.
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1.
The table below gives information on four elements represented by letters K,L,M and N. Study it and answer the questions that follow. The letters do not represent the actual symbols of the elements. (a) Which two elements have two similar properties? Explain. (b) What is the most likely formula of oxide of L? (c) Which element is a nonmetal? Explain.
2.
The table below gives the atomic numbers of elements of W, X, Y and Z. The letters do not represent the actual symbols of the elements. (a) Which one of the elements is least reactive? Explain. (b) (i) Which two elements would react most vigorously with each other? (ii) Give the formula of the compound formed when the elements in b
3.
Study the table below and answer the questions that follow: (a) Complete the table by filling in the missing atomic numbers and atomic mass. (b) Write the electron arrangement for the following ions: (i) #Ca^+# (ii) #P^(3-)# (c) What is the melting point of hydrogen in Kelvin? (d) Which of the allotropes of phosphorus has a higher density? Explain. Answer
4.
An element Y has the electronic configuration 2.8.5 (a) Which period of the periodic table does the element belong? (b) Write a formula of the most stable anion formed when element Y ionizes. (c) Explain the difference between the atomic radius of element Y and its ionic radius.
5.
The grid below shows part of the periodic table. The letters do not represent the actual symbols of the elements. (a) Select the: (i)element which has the largest atomic radius (ii)most reactive nonmetal (b) Show on the grid the position of the element J which forms #J^(2+)# ions with electronic configuration 2,8,8.
6.
The table below gives the energy required to remove the outmost electron for some group I elements. Arrange the elements in order of their reactivity starting with the most reactive.
7.
Write the formula of sulphide of an element C, whose atomic number is 5. C is not the actual symbol of the element.
8.
The information below relates to elements S,T,U and X. (the letters do not represent the actual symbols of the elements). (i) T displaces X from aqueous solution containing ions of X. (ii) Hydrogen gas reduces heated oxide of S but does not reduce the heated oxide of X. (iii) U liberates hydrogen gas from cold water but T does not. (a) Write an equation for the reaction between T and the ions of
9.
Give two reasons why helium is used in weather balloons
10.
(a) The grid given below represents part of the periodic table. Study it and answer the questions that follow. (The letters do not represent the actual symbol of the elements (i) What name is given to the group of elements to which C and F belong? (ii) Which letter represents the element that is the least reactive? (iii) What type of bond is formed when B and E react? Explain
11.
The information in the table below relates to elements in the same group of the periodic table. Study it and answer the question that follows:
12.
Explain why hydrogen forms compounds in which its oxidation state is either +1 or -1 (Atomic number of hydrogen is 1)
13.
Name one property of neon that makes it possible to be used in electric lamps.
14.
Use the reactions given below to answer the questions that follow; ( The letters do not represent the actual symbols of the elements.) (a) What name is given to the type of reaction given above? (b) Arrange the elements D,E,F and G in the order of their reactivity starting with the most reactive. (c) Complete the equation below. #G(s) +2F (aq)------>#
15.
Study the information in the table and answer the questions that follow: Explain why: (i) the ionic radius of #K^+# is greater than that of #Na^+#
16.
An atom of can form two ions. Write two equations to show how a neutral atom of hydrogen can form two ions. In each case show the sign of energy change involved.
17.
An oxide of element F has the formula #F_2o_5# (a) Determine the oxidation state of F (b) In which group of the periodic table is element F.
18.
Explain why the reactivity of group (VII) elements decreases down the group
19.
The table below shows the first ionization energies of element B and C. What do these values suggest about the reactivity of B compared to that of C?
20.
Four metals F,G,H and J were each separately added to cold water , hot water and steam . The table below is a summary of the observation made and the formulae of the hydroxides formed. (a) Which two elements are likely to be in the same group of the periodic table? (b) Arrange the metals in order of their reactivity starting with the most reactive.
21.
The table below gives some information about elements I, II,III and IV which are in the same periodic table .Use the information to answer the questions that follows. State and explain the relationship between the variations in the first ionization energies and the atomic radii
22.
The grid below is part of the periodic table. Use it to answer the questions that follow. a) Indicate on the grid the position of an element represented by letter, V whose atomic number is 14 b) Select a letter which represents a monatomic gas c) Write an equation for reaction between Q and T.
23.
The ionization energies of three elements A,B,C are as shown below. (a) What is the meant of ionization energy? (b) Which element is the strongest reducing agent? give a reason
24.
Give the name of product formed when magnesium reacts with phosphours.
25.
The diagram below represents part of the periodic table. Use it to answer the questions that follow: (a) Write the electronic arrangement for the stable ion formed by W. (b) Write an equation for the reaction between V and Q (c) How do the ionization energies of the elements M and T compare? Explain.
26.
The table below gives some properties of three elements in group (vii) of the periodic table. Study it and answer the questions that follow:a) Which element is in liquid form at room temperature? give reason
27.
The table below shows properties of some elements A,B,C and D which belong to the same period of the periodic table. a) Arrange the elements in order of there would appear in the period .Give reason
28.
a) The electronic arrangement of ion of element Q is 2.8.8. If the formula of the ion is Q3- state the group and the of which Q belongs. b) Helium ,neon, and argon belong to group 8 of the periodic .Give : I. The general name of the elements II. One use of the elements
29.
The plots below were obtained when the atomic radii of some elements in group I and II were plotted against atomic numbers. Explain: (a) The trend shown by Li ,Na and K (b) Why the atomic radii of elements Be ,Mg and Ca are lower than of Li ,Na and K
30.
a) The grid below represents parts of the periodic table study it and answer the questions that follow. I. Select the most reactive metal. explain. II. Select an element that can for charge of 3- III. Select an alkaline metal IV. Which group one element has the highest first ionization energy? Explain V. Element A combines with chloride to form a chloride of A .State the mostly likely PH value of
31.
a) Name the method that can be used to obtain pure iron (iii) chloride from a mixture of iron (iii) chloride and sodium chloride b) A student was provide with a mixture of sunflower flour, common salt and a red dye. The characteristic of the three substances in the mixture are given in the table below. The student was provided with ethanol and other materials needed .Describe below how the student
32.
An element K has the formula #K_2O_5# (a) Determine the oxidation number of K (b) To which group of the periodic table does K belong?
33.
Describe an experiment to show that group one elements react with cold water to form alkaline solutions.
34.
The figure is a section of the periodic table. Study it and answer the questions that follow. The letters do not represent the actual symbols of the elements.
35.
An atom of an element A has mass number 39 and 19 protons. (a) Write the electron arrangement of the atom. (b) State the period and group to which element A belongs Group Period (c) State whether the element is a metal or a non-metal.
36.
Study the information in the table and use it to answer questions that follow. (a) Explain the trend in atomic radii from sodium to chlorine. (b) Explain how the chloride of aluminium differs from those of other metals in the period.
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