Physical and Chemical changes
Trending Questions
What are the characteristics of a chemical reaction?
Which of the following are chemical changes?
a. Growth of a plant
b. Rusting of iron
c. Mixing of iron filings and sand
d. Cooking of food
e. Digestion of food
f. Freezing of water
g. Burning of a candle
Melting of Wax Is a Physical Change but Burning of Wax Is a Chemical Change. Explain?
What type of change takes place when a sodium hydroxide pellet is added to water?
Reversible chemical change
Chemical change
Reversible change
Physical change
What is a physical change ? Give an example
Take a mixture of iron fillings and sulphur powder in a test tube. Heat the test tube strongly till the mixture becomes red hot. Let the mixture cool and add dil. sulphuric acid to it. Which statement is true for the content of the test tube after the experiment?
Show the property of magnetism
Colourless and odorless gas evolves
Colourless gas with the smell of rotten eggs
A physical change takes place
Why is the digestion of food a chemical change?
What are the factors which are responsible for bringing a change in the physical state of a matter ?
Is dissolution of copper sulphate in water a chemical change? Justify your answer.
Classify the following as chemical or physical changes:
f. Dissolving common salt in water
Is cutting of trees physical change or a chemical change? Explain .
According to google it's chemical change .
(a) What is a physical change ? Give two examples of physical changes.
(b) What is chemical change ? Give two examples of chemical changes.
Is burning of coal a physical change?
Explain physical change and chemical change and physical properties and chemical properties.(explain briefly)
Is drying of clothes a physical change?
The process of melting of ice-cream is considered as:
Physical change
Irreversible change
Chemical change
Both physical and chemical change
The rusting of an iron object is called:
(a) corrosion and it is a physical as well as a chemical change
(b) dissolution and it is a physical change
(c) corrosion and it is a chemical change
(d) dissolution and it is a chemical change
Which of these is not a chemical reaction?
Digestion of food
Baking of a cake
Tearing of paper
Fermentation of grapes
Which of the following method is used to separate mixture of two miscible liquids?
Sedimentation and decantation method
Separation using a separating funnel
Simple or fractional distillation
Sublimation
Reason: Chemical change is a reaction involving the change in chemical properties or composition, resulting in the formation of a new substance.
- Both assertion and reason are correct and reason is the correct explanation for assertion.
- Both assertion and reason are correct but reason is not the correct explanation for assertion.
- Assertion is correct but the reason is incorrect.
- Both the assertion and reason are incorrect.
Germination of seed can be classified as
Classify the following as physical or chemical changes:
(i) Cooking of food (ii) Boiling of water
(iii) Cutting of trees (iv) Dissolving salt in water
(v) Digestion of food (vi) Melting of ice
Classify the following as chemical or physical changes:
e. Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases
Classify the following as chemical or physical changes:
d. Boiling of water to form steam
Which of the following are physical changes and which are chemical changes ?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid . A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A . Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
A change in the physical state can be brought about
(a) Only when energy is given to the system
(b) Only when energy is taken
(c) When energy is either given to, or taken out from the system
(d) Without any energy change
- Burning of coal
- Melting of ice
- Souring of milk
- Digestion of food in the body
