Melting of ice is an example of:
Exothermic reaction
Endothermic reaction
Chemical combination
Chemical decomposition
A chemical change is also called
Reversible change
Physical change
Temporary change
Chemical reaction
Burning of Magnesium ribbon is a ________ change.
Physical
Chemical
Reversible
Temporary
The formation of rust on the surface of iron is called __________ of iron.
rusting
melting
condensation
none of these
Burning of wood is a _________ change.
Properties such as shape,size,colour and state of a substance are called its ________ properties.
Thermal
Thermodynamic
The chemical name of baking soda is
Sodium carbonate
Sodium hydrogen carbonate
Calcium phosphate
Calcium oxychloride
The cells used in a wrist watch undergo:
Periodic change
Chemical change
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
