 With reference to atomic number of one, explain why hydrogen can be placed in either group I and VII of the periodic table. K.N.E.C Marking Scheme
Hydrogen forms compounds by losing one electron like group I elements or by gaining one electron like group VII element /Hydrogen has one electron in outermost shell.
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A Solution of chlorine in tetra chloromethane turns colourless when propene gas is bubble though it.
K.N.E.C Marking Scheme
In an experiment, rods of metals P, Q and R were cleaned with sand paper and placed in a beaker containing water. Another set of rods was also cleaned and placed in a beaker containing dilute acid. After placing the rods in the two liquids bubbles of gas were seen around some of the rods as shown in the diagrams below.
K.N.E.C Marking Scheme
Study the set – up below and answer the question that follows. State and explain the observations that would be made when the circuit is completed.K.N.E.C Marking Scheme
The diagram below represents a set–up that can be used to prepare and collect oxygen.
knec answers
The curve below represents the variation of temperature with time when pure and impure samples of a solid were heated separately.
Which curve sows the variation in temperature for the pure solid? Explain (2mks)
knec answers
​II-Because pure substances have sharp MP and BP as shown by the flat regions of curve II. (accept systematic) (2 mks)
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