Chemistry
Match the following :
| Column A | Column B |
|---|---|
| (a) It changes the rate of a chemical reaction | (i) Photosynthesis |
| (b) Attractive force between the atoms to form molecules | (ii) Amphoteric oxide |
| (c) Oxides of non-metals | (iii) Catalyst |
| (d) Lead monoxide | (iv) Chemical bond |
| (e) Light energy | (v) Acidic oxides |
Related Questions
Fill in the blanks:
(a) A reaction in which two or more substances combine to form a single substance is called a …………… reaction.
(b) A …………… is a substance which changes the rate of a chemical reaction without undergoing a chemical change itself.
(c) The formation of gas bubbles in a liquid during a reaction is called …………… .
(d) The reaction between an acid and a base is called …………… .
(e) Soluble bases are called …………… .
(f) The chemical change involving iron and hydrochloric acid illustrates a …………… reaction.
(g) In the type of reaction called …………… two compounds exchange their positive an negative radicals respectively.
(h) A catalyst either …………… or …………… the rate of a chemical change but itself remains …………… at the end of the reaction.
(i) The chemical reaction between hydrogen and chlorine is a …………… reaction.
(j) When a piece of copper is added to silver nitrate solution, it turns …………… in colour.
Write true or false for the following and correct the false statements.
(a) When iron nails are put into a solution of copper sulphate, the solution becomes colourless after sometime.
(b) Burning of fuel in air produces a large amount of energy in the form of heat and light.
(c) Exchange of radicals takes place when calcium oxide reacts with water.
(d) A neutral oxide does not change the colour of an indicator.
(e) A white solid is produced when lead nitrate is heated.
Name the following :
(a) The substances formed due to a chemical reaction.
(b) An insoluble solid produced when two substances in solution form are mixed together.
(c) The compounds formed by the reaction between oxygen and any other element.
(d) The chemical reactions in which energy is released.
(e) A chemical reaction in which a substance breaks to give two or more simpler substances.
Give one example for each of the following :
(a) An oxide which gives salts both with an acid and a base.
(b) An oxide which does not change the colour of indicators.
(c) A neutral oxide which is a universal solvent.
(d) An oxide which produces salt and water with an acid.
(e) A soluble metallic oxide which produces an alkali.