Chemistry
Fill in the blanks:
(a) The substances which undergo chemical change are called …………… .
(b) The substances formed as a result of a chemical reaction are called …………… .
(c) During a chemical reaction, transfer of …………… takes place.
(d) The basic condition necessary for a chemical reaction is …………… .
(e) In some chemical reactions, an insoluble …………… is formed when two solutions are mixed.
Related Questions
Write your observations for the following chemical reactions and name the products formed:
(a) When sugar is heated.
(b) When manganese dioxide is added to potassium chlorate and heated.
(c) When dilute acetic acid is poured on baking soda.
(d) When an aqueous solution of sodium chloride is mixed with an aqueous solution of silver nitrate.
(e) When ammonium chloride is heated with sodium hydroxide.
(f) When water is added to quick lime.
What information do you get from the equation
H2 + Cl2 ⟶ 2HCl?
Write True or False for the following statements:
(a) No new substance is formed during a chemical reaction.
(b) Hydrogen sulphide has rotten egg smell.
(c) When potassium iodide solution is added to lead acetate solution, a red precipitate is formed.
(d) A black residue is formed when sugar is heated.
(e) When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet.
A chemical equation is a statement that describes a chemical change in terms of:
- Symbols and formulae
- Energy
- Number of atoms
- Colours