Question

Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, equality sign)

a. An................... is drawn in between the reactants and products while writing the equation for a chemical reation.

b. Rusting of iron is a............. chemical change.

c. The spoiling of food is a chemical change which is recognized from the generation of certain................ due to it.

d. A colourless solution of calcium hydroxide in a test tube turns..............on blowing in it through a blow tube for some time.

e. The white particles of baking soda disappear when put in lemon juice. This means that it is a.....................change.

f. Oxygen is a....................... in respiration.

g. Sodium chloride is....................compound while hydrogen chlorid is........................ compound.

h. Electron.............................. is complete in each hydrogen in a hydrogen molecule.

i. Chlorine (Cl₂) molecule is formed by..................... of electrons between two chlorine atoms.

Answer 1

a. An arrow is drawn in between the reactants and products while writing the equation for a chemical reation.

b. Rusting of iron is a slow chemical change.

c. The spoiling of food is a chemical change which is recognized from the generation of certain smell due to it.

d. A colourless solution of calcium hydroxide in a test tube turns milky on blowing in it through a blow tube for some time.

e. The white particles of baking soda disappear when put in lemon juice. This means that it is a chemical change.

f. Oxygen is a reactant in respiration.

g. Sodium chloride is ionic compound while hydrogen chloride is covalent compound.

h. Electron duplet is complete in each hydrogen in a hydrogen molecule.

i. Chlorine (Cl₂) molecule is formed by sharing of electrons between two chlorine atoms.