Classify the Following as Chemical Or Physical Changes: Melting of Butter in a Pan - Science

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Classify the following as chemical or physical changes: Melting of butter in a pan

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Solution

Melting of butter in a pan → Physical change

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Chapter 2: Is Matter around us Pure - Intext Questions [Page 24]

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NCERT Science Class 9
Chapter 2 Is Matter around us Pure
Intext Questions | Q 1.2 | Page 24

RELATED QUESTIONS

Classify the following as chemical or physical changes:- Making a fruit salad with raw fruits


Explain the term Pure substance by giving examples.


Classify the changes involved in the following processes as physical or chemical changes:

Photosynthesis

Dissolving sugar in water

Burning of coal

Melting of wax

Beating aluminium to make aluminium foil

Digestion of food


When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.


Explain why burning of wood and cutting it into small piece are considered as two different types of changes.


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Changes that occur in nature are called ........................


Match the columns

           column A                coulmn B 
1. A change which cannot be  easily reversed  a. man-made change 
2.A change that repeats itself at  regular  intervals b. chemical change 
3. A change that is made by humans  c. physical change 

4. A change in which the original substance cannot  be obtained 

d. periodic change 

5. A change where no  new substance is formade  e. irreversible change 
  f. slow change

Write true or false for the statement

A natural change can also be a desirable 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


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Chemical change occurs as a result of __________ between two substances.


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When a candle burns, wax melts. Melting of wax is a ________ change.


State whether the following is physical or chemical changes.

water cycle in nature —


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Earthquake is a desirable change.


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Heat is ________ by a gas during the process of condensation.


Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y 􀁯 P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following  statements concerning X, Y and P are correct ?

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  2. X and Y are compounds
  3. X and Y are elements
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What is a physical change ? Give two examples of physical changes.


Which of the following are physical changes and which are chemical changes ?


Which of the following are physical changes and which are chemical changes ?

 Rusting of iron


Which of the following are physical changes and which are chemical changes ?

Glowing of an electric bulb


Which of the following are physical changes ?

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  3. bending of an iron rod
  4. drawing a wire of iron metal

Which of the following are chemical changes ?

  1. decaying of wood
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  3. sawing of wood
  4. hammering of nail into wood

Classify the following as a physical or a chemical change.

Burning of paper


Classify the following as a physical or a chemical change.

Melting of wax


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A change, which alters the composition of a substances, is known as a___________ change.


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Physical change and chemical change


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A physical change in a substance.


What will you take into account while identifying the following?

A chemical change in a substance.


Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.


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Slow and fast change.


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Fill in the blank with the appropriate word of the statement given below:

Germination of seeds is considered a __________ change.


Name the following:

The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.


Select the chemical changes from the following list of changes

Drying of a fruit


Select the chemical changes from the following list of changes

The crystallisation of salt from its solution.


Name the following.

The gaseous product of the chemical change which takes place during respiration in living organisms.


When ice melts to form water, change occurs in its


Digestion of food is a physical change.


In a solution of salt in water, water is the solute


You are given some candle wax. Can you make a candle doll from it? What kind of change is this?


When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.


Stretching gold coin into a ring is a ______ change.


Classify the following changes as physical and chemical changes

A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.

Sr. No. Physical changes Chemical changes
1.    
2.    

Wood to sawdust:______:: Wood to Ash: Chemical change


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What is the difference between dissolution of sugar and burning of sugar ?


Assertion: Burning of wood log to charcoal is a physical change.

Reason: The products formed of burning a piece of wood can be easily converted back to wood log.


Sublimation of Iodine is a ______.


Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.


______ is the substance that is dissolved in a solvent.


Gas exists in three states as solid, liquid, and gas.


Natural changes which take place in nature on their own, are beyond the control of human being.


Analogy:

Melting of ice: Physical change.
Popping of popcorn: ______.


Water is the universal solvent. Why?


Which of the following is a physical change?


What kind of change is shown by tearing off paper?


Match the items of Column I with the items of Column II

Column 1 Column II
(a) Large crystals (i) Turns lime water into milky
(b) Depositing a layer of zinc on iron (ii) Physical change
(c) Souring of milk (iii) Rust
(d) Carbon dioxide (iv) Sugar candy (Mishri)
(e) Iron oxide (v) Chemical change
(f) Dissolving common salt in water (vi)  Galvanisation

A physical change is generally____________.


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Physical changes are reversible.


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Do you think rust is different from iron?


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Iron pipes coated with zinc do not get rusted easily.


Mention some of the different conditions needed for chemical changes to occur.


Give an example of a physical change in which the color of the substance changes.


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