(1)(a) The elements in Group
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white of the periodic table are known as the
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white metals because they form oxides or
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white which dissolve in water to give
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white solutions of
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(b) They are metals with
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white density and the first three in the Group are less
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white than water, and so
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(c) They have unusually low
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white points and the solids are quite
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(2)(a) They react with non-metals to form
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white e.g. with oxygen to form
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white , sulfur to form
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white and
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white to form chlorides.
(b) These salt-like compounds are
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white solids which
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white in water to form
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white neutral solutions of
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(c) The formula for sodium chloride is
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white , and sodium hydroxide is
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(3)(a) The Alkali Metals react exothermically with water releasing
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white and forming soluble alkaline hydroxides.
(b) When a piece of
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white , sodium or potassium is placed in
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white water the metal
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white because of its low
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(c) It and may melt and move around the surface with lots of
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white . The more reactive the metal, the
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white the reaction with water.
(d) A simple laboratory test for the
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white gas is that when a test tube of the gas is held to a
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white the gas burns in the air with a squeaky
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
(e) During the reaction
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white indicator will turn from
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white to
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white .
eg sodium + water ==>
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white 1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white +
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white (4) In Group 1, the further
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white the group with increase in
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white , the
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white reactive the alkali metal and the
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white its melting point and
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white point.
(5) When heated in a bunsen flame
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white metal or compounds give a yellow flame colour and
1 alkali alkaline atomic number boiling chlorine cold colourless compounds dense density dissolve down explosion faster fizzing flame float floats green hydrogen hydroxide hydroxides lithium low lower melting more NaCl NaOH oxides pH 14 pH 7 potassium purple sodium soft sulfides universal white metal or compounds give a purple colour in a hot flame.