Chemistry
A chemical equation is a statement that describes a chemical change in terms of:
- Symbols and formulae
- Energy
- Number of atoms
- Colours
Chemical Equation
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Answer
Symbols and formulae
Reason — A chemical reaction can be represented with the help of symbols or the formulae of the elements and the compounds taking part in the reaction in the form of a chemical equation.
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Related Questions
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.
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.
Balancing a chemical equation is based on:
- Law of conservation of mass
- Mass of reactants and products
- Symbols and formulae
- None of the above
Copper carbonate when heated turns:
- Blue
- Green
- Black
- Yellow