Maharashtra Board Class 8 Science Solution Chapter 13 – Chemical Change and Chemical Bond
Balbharati Maharashtra Board Class 8 Science Solution Chapter 13: Chemical Change and Chemical Bond. Marathi or English Medium Students of Class 8 get here Chemical Change and Chemical Bond full Exercise Solution.
Std | Maharashtra Class 8 |
Subject | General Science Solution |
Chapter | Chemical Change and Chemical Bond |
(1) (a.) An _______ is drawn in between the reactants and products while writing the equation for a chemical reaction.
Ans. Arrow.
(b.) Rusting of iron is a ______ chemical change.
Ans. Slow.
(d.) A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Ans. Milky.
(e.) The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.
Ans. Chemical.
(f.) Oxygen is a _______ in respiration.
Ans. Reactant.
(g.) Sodium chloride is _______ compound while hydrogen chloride is ______ compound.
Ans. Ionic & Covalent.
(h.) Electron _______ is complete in each hydrogen in a hydrogn molecule.
Ans. Duplet.
(i.) Chlorine (Cl2) molecule is formed by ________ of electrons between two chlorine atoms.
Ans. Sharing.
(2.) Explain by writing a word equation.
(a.) Respiration is a chemical change.
(b.) Hard water gets softened on mixing with a solution of washing soda.
(c.) Lime stone powder disappears on adding to dilute hydrochloric acids.
(d.) Bubbles are seen on adding lemon juice to baking soda.
(4.) Show with the help of diagram of electronic configuration how the following compound are formed from the constituent atoms.
(a.) Sodium chloride
(b.) Potassium fluoride
(c.) Water
(d.) Hydrogen chloride