i) Alkaline earth metals
ii) A
iii) Covalent: They form bond by sharing of electrons since they are both non-metals
iv) D2O3
johnmulu answered the question on April 10, 2017 at 08:04
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The table below gives the energy required to remove the outermost electron for some group I elements
Arrange the elements in order of their reactivity starting with the most reactive.
Date posted: April 7, 2017. Answers (1)
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The grid below shows part of a periodic table. The letters do not represent the actual symbols of the elements.
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a) Select the;
i) Element which has the largest atomic radius.
ii) Most reactive non-metal.
Date posted: April 7, 2017. Answers (1)
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b) Write the electron arrangement for the following ions: (i) Ca+ (ii) P3-
c) What is the melting point of hydrogen in Kelvin?
d) Which of the allotropes of phosphorous has a higher density? Explain.
e) The mass numbers of three isotopes of magnesium are 24, 25 and 26.
What is the mass number of the most abundant isotope of magnesium? Explain.
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g) Explain the difference in the melting points of magnesium and sodium.
Date posted: April 7, 2017. Answers (1)
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The table below gives the atomic numbers of elements 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.
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(ii) Give the formula of the compound formed when the elements in b (i) react.
Date posted: April 7, 2017. Answers (1)
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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 non-metal? Explain
d) Which one of the elements is the strongest reducing agent? Explain.
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f) Explain why the ionic radius of L is bigger than its atomic radius.
Date posted: April 7, 2017. Answers (1)
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The table below is part of the periodic table. The letters are not the actual symbols of the elements. Study it and answer the questions that follow.
a) Select an element which is stored in paraffin in the laboratory
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Date posted: April 7, 2017. Answers (1)
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a) Arrange the metals in the order of reactivity starting with the most reactive.
b) Name a metal which is likely to be: (i) X (ii) Y
Date posted: April 7, 2017. Answers (1)
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a) What is meant by the term radial?
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Date posted: April 7, 2017. Answers (1)
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Use the part of the periodic table given below to answer the questions that follow. (letters are not the actual symbols of elements.)
a) Identify the element that forms giant covalent structures.
b) Identify one element that does not form compounds
c) Write the formula for the nitride of M.
Date posted: April 7, 2017. Answers (1)
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The table below gives the number of electrons, protons and neutrons in substances X, Y and Z. Study it and answer the questions that follow.
a) Which letter represents an ion?
b) Which of the substances are isotopes? Give reason.
Date posted: April 7, 2017. Answers (1)
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The table below shows the number of valence electrons of the element P, Q and R.
a) Explain why P and R would not be expected to form a compound.
b) Write an equation to show the effect of heat on the carbonate of R.
c) Write the formula for the most stable ion of Q
Date posted: April 7, 2017. Answers (1)
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The table below shows the relative atomic masses and the percentage abudance of the isotopes L1 and L2 of element L.
Calculate the relative atomic mass of element L.
Date posted: April 7, 2017. Answers (1)
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(The letters do not represent the actual symbols of the elements)
(Solved)
Use the information in the table below to answer the questions that follow.
(The letters do not represent the actual symbols of the elements)
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b) Give the number of neutrons in an atom of element D.
Date posted: April 7, 2017. Answers (1)
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Date posted: April 7, 2017. Answers (1)
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The set up below was used to investigate the reaction between dry hydrogen gas and copper (II) oxide.
a) Name substance A.
b) State the observation made in the combustion tube.
c) Explain the observation stated in (b) above.
Date posted: April 7, 2017. Answers (1)
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The set up below was used to investigate the reaction between dry hydrogen gas and copper (II) oxide.
a) Name substance A.
b) State the observation made in the combustion tube.
c) Explain the observation stated in (b) above.
Date posted: April 7, 2017. Answers (1)
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The set-up below was used to investigate the products of burning biogas (methane). Study it and answer the questions that follow.
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b) State and explain the observations which will be made in Z.
Date posted: April 7, 2017. Answers (1)
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A student used the set up shown in the diagram below in order to study the reactions of some metals with steam. The experiment was carried out for ten minutes.
a) What observation would be made if gas F is ignited?
b) When the experiment was repeated using iron powder instead of magnesium ribbon, very little gas F was obtained.
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Date posted: April 7, 2017. Answers (1)
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Date posted: April 7, 2017. Answers (1)
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In laboratory experiment hydrogen gas was passed over heated copper (II) oxide as shown in the diagram below.
Describe a chemical test that can be used to identify the product E.
Date posted: April 7, 2017. Answers (1)