Tag: changes and its classification

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Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Halley's comet revolves around the sun once in every 76 Years. This is a:

  1. photochemical change

  2. periodic change

  3. chemical change

  4. irreversible change
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is a periodic change $-$ because changes that occur after a fix interval of time is known as periodic change.

Here periodic change in $76$ years
photochemical change is due to light chemical change $-$ where reactant react to produce products.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Iron pipes coated with zinc do not get rusted easily.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is true.

Coating iron with zinc is known as galvanizing. Iron metals get rusted when in contact with oxygen and moisture (air).
If coated with zinc, no interaction between oxygen and iron is there and hence the pipe does not get rusted easily.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

When an iron nail is added to acidic copper sulphate solution, the colour of the deposit on the iron nail is:

  1. brown

  2. blue

  3. green

  4. pink
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a nail is added to acidic copper sulphate solution, the color of the deposit on the iron nail is brown. Copper sulphate reacts with iron to form iron sulphate and copper. Brown colored copper deposits on nail.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

A change in which a substance undergoes changes in its physical properties is called:

  1. chemical change

  2. physical change

  3. no change

  4. biological change
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A change in which a substance changes its physical properties like appearance, texture, colour, odour, melting points, boiling points, density, solubility, polarity etc... are called physical changes. 


Physical properties can be observed or measured without changing the composition of matter. They are used to observe and describe matter.

Hence, the correct option is $\text{B}$

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

When substance cool off, there is a decrease in:

  1. size of substance

  2. vibrations of the molecules

  3. temperature

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a substance cools off, the size of substance, vibrations, a temperature of the substance decreases, as the heat is dissipated out resulting in the decrease in the size of the substance, and the internal vibrations between the molecules also decrease as the temperature decreases, due to the loss of heat.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

A metal ball which is passing through metal ring will not pass after :

  1. heating

  2. freezing

  3. constant conditions

  4. refrigerating
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

All metals have a property of expansion when heated. Since the metal ball is heated, it will expand and will not pass the ring now.


Thus heating is the correct answer.

Hence the option A is correct.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Permanent change is a :

  1. Physical change

  2. Chemical change

  3. Both physical and chemical change

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A chemical change is permanent. A new substance is formed.


Forms of energy, such as heat, light or electricity, may be emitted or absorbed during a chemical reaction. A chemical change is generally irreversible.

Hence option B is correct.