KAIRI SECONDARY SCHOOL
FORM 3 CHEMISTRY DECEMBER HOLIDAY ASSIGNMENT
1. (a) The grid below represents parts of the periodic. Study the information and answer the questions that follow. The letters do not represent the actual symbol of the elements.
CH / W / T / R / Y / F
E / S / Z
M / I
(i) Which element would form a trivalent cation?
(ii) Write the equation for the reaction that would occur between E and Y
(iii) Which elements belong to the region labelled W
(iv) Which is the most reactive non-metallic element in the table above? Explain
(v) How does the atomic radius of T compare with that of Y. Explain
(b) The table below shows some properties and electron arrangements of common ions of elements represented by letters D to K. Study the information and answer the questions that follow.
Element / Formula of ion / Ionic electron arrangement / Atomic radius (nm) / Ionic radius (nm)D / D- / 2.8 / 0.072 / 0.136
E / E+ / 2.8.8 / 0.231 / 0.133
F / F3+ / 2.8 / 0.143 / 0.050
G / G2+ / 2.8.8 / 0.133 / 0.074
H / H2+ / 2.8 / 0.160 / 0.064
I / I+ / 2.8 / 0.186 / 0.095
J / J3- / 2.8.8 / 0.110 / 0.190
K / K- / 2.8.8 / 0.099 / 0.181
(i) State the atomic numbers of elements F and G
(ii) Select two metals that belong to period 3
(iii) Element I reacts violently with water. Write the equation for the reaction
(iv) Why is the ionic radius of G smaller than its atomic radius?
(v) Compare and explain the reactivity of G and H
2. The grid below shows a section of the periodic table. The letters do not represent the actual symbols for elements. Study it and answer the questions that follow.
XY / C / W
Z / R / A
E / D / B
(a) Compare the atomic radii of elements:
(i) A and R. Explain
(ii) C and D. Explain
(b) Give the name of the family in which elements W and A belongs.
(c) Identify the element which is
(i) Most electronegative
(ii) Strongest reducing agent
(d) Write the formula of the oxide of X
(e) (i) What type of bond and structure exists in the chloride of R
(ii) Draw the structure of the molecule of chloride of R in gaseous state
(iii) Write an equation for the reaction between element A and water
(f) The table below shows the melting points of some period 3 oxides
Oxide / SiO2 / P4O6 / SO2M.P0C / 1610 / 23.6 / -72.7
Explain the difference in melting points of SiO2 and P4O6
(g) Excess hydrogen gas is reacted with 4.5g of heated oxide of metal Q. 3.6g of Q is finally left in the reaction vessel. Given that O=16, Q has a valency of 2.
(i) Write the equation for the reaction taking
(ii) Calculate the relative atomic mass of Q
3. 12.5 cm3 of solution containing 13.8g/cm3 of carbonate M2 Co3 required 12.3 cm3 of H2 SO4 containing 9.8g/ dm3 for complete neutralization.
(a) Write the equation for the above reaction
(b) Calculate the molarity of the acid
(c) Calculate the molarity of the carbonate
(d) Calculate the molar mass of the carbonate
(e) Find the relative atomic mass of M
4. Solution “A” is NaOH containing 48g/dm3. Solution “B” is (CooH)z: nH2O containing 63g/dm3. 20cm3 of solution “A” was pipetted into a conical flask and titrated with solution “B”. The titration was done three times. The results are shown in table below. The equation for the reaction is:
(CooH2:nH2O(aq) + 2NaoH(aq) →CooNa2(aq) + (n+ H2(l)
Experiment / 1 / 1 / 3Final readings / 24.1 / 24.1 / 49.0
Initial readings / 0.0 / 0.0 / 25.0
Volume used / 24.1 / 24.1 / 24.0
Find
(i)The average volume of solution “B” used
(ii)The moles of solution “A” in 20 cm3 of solution
(iii)The number of moles of “B” in 1dm3 of the solution
(iv) The formula mass of (CooH)2 nH2O
(iv)Value of n
(C= 12) (O= 16 (H= 1)
5. (a) Give the systematic names for the following compounds
(i)CH3CH2COOH
(ii)CH3CH2CH2CHCH2
(iii)CH C CH2CH3
(b) Study the flow chart below and use it to answer the questions that follow:
(i) Identify the organic compound K
(ii) Write the formula of M
(iii) Give one reagent that can be used in:
(I)Step I
(II)Step II
(iv)Write the equation of the reaction in step III
*END*
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