Chemical changes are
temporary
partial
permanent
none of these
When liquids are heated, they turn into gases. The yellow egg yolk present inside the egg is a liquid but when it is heated, it changes into an omelet which is solid, why?
Sometimes, liquids turn into solids
Omelet does not follow the above rule
Strictly speaking, the rule does not apply to complex mixtures and egg yolk is a complex mixture
The given statement is false
A seed growing into a tree is an example of:
Slow physical change
Fast periodic change
Slow natural change
Man made reversible change
Photosynthesis is a _________ change.
Physical
Reversible
Temporary
Chemical
The cells used in a wrist watch undergo:
Physical change
Periodic change
Chemical change
None of these
The chemical name of baking soda is
Sodium carbonate
Sodium hydrogen carbonate
Calcium phosphate
Calcium oxychloride
Burning of wood is a _________ change.
A change in which a substance undergoes a change in its physical properties is called a ________ change.
Thermal
Thermodynamic
Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical combination
Chemical decomposition
Which of the following is the easiest to change?
The colour of your hair
The shape of your face
The colour of your eyes
Both A & C
