The changes occur in egg after heating process are

  • reversible
  • irreversible
  • same
  • constant

The changes which cannot be returned back to their original products are

  • reversible
  • irreversible
  • same
  • constant

When a material is burnt it forms new material by using gas from atmosphere called

  • oxygen
  • nitrogen
  • carbonmono oxide
  • carbon dioxide

When a fruit salt is mixed with water we observe

  • bubbles of gas
  • no visible change
  • salty taste
  • blue color

On heating sugar gives off

  • carbon(black solid0
  • water vapors
  • both a and b
  • carbon dioxide

When a candle is lit solid wax melts into

  • liquid
  • vapor
  • gas
  • molten

In case of chocolate the heating lead to changes which are

  • reversible
  • irreversible
  • same
  • constant

Substances which burn in air rapidly and catch fire easily are called

  • flammable
  • inflammable
  • both a and b
  • not flammable

The melting and vaporization of candle is

  • reversible
  • irreversible
  • both a and b
  • constant

The water which leaves during any evaporation is disappeared in form of

  • liquid
  • vapor
  • solid
  • gas

When egg shell is mixed with vinegar a gas is released in atmosphere

  • oxygen
  • nitrogen
  • carbonmono oxide
  • carbon dioxide

When a salt is mixed with water it forms a

  • solution
  • medicines
  • food additive
  • preserver

If candle wax is itself burned then its

  • reversible
  • irreversible
  • both a and b
  • constant

Sugar undergoes changes on heating which are

  • reversible
  • irreversible
  • same
  • constant

To initiate a material for burning we need

  • heat
  • water
  • flammable liquid
  • sunlight

Serious damages, injuries and even deaths are caused by

  • fire
  • oil
  • gas
  • carbon

If sugar is heated it undergoes

  • reaction
  • evaporation
  • condensation
  • decomposition

Burning of fireworks is a change which is

  • reversible
  • irreversible
  • both a and b
  • constant

During burning process, energy is released in form of

  • light energy
  • heat energy
  • both a and b
  • chemical energy

Changes in matter takes place

  • in day
  • noon
  • night
  • all the time
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