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a) 2.5
b) Q Group 1 , Period 4
R Group 2, Period 3
maurice.mutuku answered the question on October 15, 2019 at 06:32
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Compare with a reason the atomic radius of Sodium to that of Aluminum.
Date posted: October 15, 2019. Answers (1)
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(i) Sodium metal
(ii) Sodium Chloride solution
(iii) Molten Lead Bromide(Solved)
Identify the particles that facilitate the electric conductivity of the following substances
(i) Sodium metal
(ii) Sodium Chloride solution
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Date posted: October 15, 2019. Answers (1)
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a) Write the electronic configuration of the most stable ion of W
b) Write the formula of the oxide...(Solved)
An element W has an atomic number 13.
a) Write the electronic configuration of the most stable ion of W
b) Write the formula of the oxide of the element W
Date posted: October 15, 2019. Answers (1)
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The grid below is part of the periodic table. The elements are not represented by their actual symbols. Use the information to answer the questions that follow.
a) (i) Which is the most reactive
(I) Non — metal?
Explain
(II) Metal?
Explain
(ii) Name the family to which elements T and Q belongs.
(iii) Write the formula of the compound formed when W reacts with S.
(iv) Name the type of bond and structure formed when elements R and K react.
(v) Explain why element N doesn’t form compounds with other elements.
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Date posted: October 15, 2019. Answers (1)
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The grid below represents part of the periodic table. Study it and answer the questions that follow:
(a) (i) Identify the element that gains electrons most readily
(ii) Which of the metal is most reactive? Explain
(iii) What name is given to the family of elements to which elements X and T belong?
(iv) Explain why:-
(I) Ionic radius of Q is larger than that of M
(II) Atomic radius of Q is greater than that of S
(v) Which of the element in the table does not have the ability to form an ionic or covalent
bond? Explain
(vi) Give the formula of the compound formed between R and Z
Date posted: October 15, 2019. Answers (1)
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The grid below represents part of the periodic table. The letters do not represent the actual symbols of the elements. Study it and answer the questions that follow:
(a) Explain why element L appears in two different groups in the grid above
(b) State the name of the chemical family to which P and Q belong
(c) Write the formula of the compound formed between P and V
(d) Compare the melting points of Q and S. Explain
(e) Identify an element whose oxide dissolves in both acids and alkalis
(f) Write the equation for the burning of T in excess air
(g) Using dots (•) and cross (x) to represent electrons, draw a diagram to illustrate bonding in the sulphide of Q
(h) State one use of element X
Date posted: October 15, 2019. Answers (1)
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Study the equation below:
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Which species has undergone oxidation .Explain
Date posted: October 15, 2019. Answers (1)
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Date posted: October 15, 2019. Answers (1)
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Study the table below and answer the questions that follow.
(i) Complete the table above
(ii) From the table, choose the most reactive metal. Explain
(iii) Which element is the most electronegative. Explain
(iv) Using dots (.) and crosses (x) to represent electrons, show the bonding in the chloride of Q
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(b) (i) Why is aluminium used to make utensils yet it is a reactive metal?
Date posted: October 15, 2019. Answers (1)
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The grid below shows a part of the periodic table. The letters do not represent the actual symbols.
Use it to answer the questions that follow:-
(a) How do the atomic radius of element X and Y compare
(b) (i) Using crosses (X) to represent electrons, draw the atomic structure of element Q
(ii) State the period and the group to which element Q belong
(c) (i) The ionic configuration of element G is 2.8 G forms an ion of the type G-1.
Indicate on the grid, the position of element G.
(ii) To which chemical family does element G belong?
(iii) State one use of element U
(iv) What is the nature of the compound formed between K and U
Date posted: October 15, 2019. Answers (1)
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The following flow chart shows the industrial manufacture of Nitric (V) acid.
a) Identify substance B, C, E and F.
b) Describe what happens in the catalytic chamber.
c) State what takes place in chamber D.
d) 60 – 65% nitric (V) acid is produced in the absorption chamber. Describe how the acid can be
concentrated.
Date posted: October 14, 2019. Answers (1)
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The grid below is part of the periodic table. Use it to answer the questions that follow:
a) Write down the formula of the compound formed between C and A.
b) Which element has the same electron arrangement as the stable ion of:
(i) F (ii) A
c) Element Q has atomic number 15. Indicate its position on the grid.
d) Explain how the atomic radii of the following compare:
(i) C and F
(ii) C and D
e) Write the type of bond present in a compound formed between D and A.
f) Compound C and G were completely burned in oxygen.
(i) Write down equations to show the combustion of each of the elements.
(ii) State whether each of the oxides (i) above is basic or acidic.
Date posted: October 14, 2019. Answers (1)
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Date posted: October 14, 2019. Answers (1)
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Date posted: October 14, 2019. Answers (1)
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The table below gives information about the ions T+ and Z2-
(a) How many protons are there in the nucleus of ?
(i) Element T?
(ii) Element Z?
(b) Determine the relative formula mass of the compound formed between T and Z
(c) State two conditions under which the compound would conduct electricity
Date posted: October 14, 2019. Answers (1)
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(a) State the valency of element G
(b) In which group of the periodic table is element...(Solved)
An oxide of element G has the formula as G2O3
(a) State the valency of element G
(b) In which group of the periodic table is element G?
Date posted: October 14, 2019. Answers (1)
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An element M has two isotopes M and M . The relative atomic mass of the naturally occurring is 63.55. Calculate the percentage of each isotope
Date posted: October 14, 2019. Answers (1)
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Given that isotope C contains 31 neutrons in its nucleus,find the number of protons in isotope B
Date posted: October 14, 2019. Answers (1)
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Date posted: October 14, 2019. Answers (1)
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(a) Write the electronic...(Solved)
Element A has atomic mass 23 and element B has atomic mass 7 and also have 12 neutrons and 4 neutrons respectively.
(a) Write the electronic arrangement of A and B
(b) Which element has higher ionization energy? Explain
Date posted: October 14, 2019. Answers (1)