Advertisements
Advertisements
प्रश्न
Name the following.
A form of energy required for a chemical change.
Advertisements
उत्तर
Generally, HEAT ENERGY is required but light, pressure, or electricity can also be needed.
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Classify the following changes as physical or chemical:- photosynthesis in plants
Give two examples of periodic changes.
Classify the following changes as physical or chemical.
What is a chemical change ? Give two examples of chemical changes.
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Differentiate between a physical change and a chemical change with reference to – Formation of products.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Filling up a balloon with hot air is a _______ change.
