Advertisements
Advertisements
Question
Give an example of a reaction where the following are involved
Electricity
Advertisements
Solution
\[\ce{2H2O->[Electricity] 2H2 + O2}\]
APPEARS IN
RELATED QUESTIONS
FILL IN THE BLANK
In a ............ change, new substances are formed.
What are chemical reactions?
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
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, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Explain the following statement: Digestion is a chemical change.
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
Write the effects of chemical reactions.
