The characteristics of a good fuel are
It should release more energy
It should be safe
It should be easily transportable
All of the above
In a physical change
New substances are not formed
Reaction is reversible
Change is temporary
When liquids are heated, they turn into gases. The yellow egg yolk present inside the egg is a liquidbut 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
None
In our body, ______ acts as catalysts
Vitamins
Minerals
Enzymes
Water
If two substances interact to produce a change, they will do so
Under any condition
No matter what kind of interaction there is
Only if the interaction is of the right kind and under the right conditions
Only if they are in close contact with each other
As the concentration of reactants increases
Rate of the reaction decreases
Rate of the reaction increases
Rate of the reaction remains the same
Reaction stops
Burning of a match stick is a/an
Endothermic reaction
Exothermic reaction
Chemical change
Both B & C
Dissolving sugar in water is a
Combination reaction
Reversible change
Decomposition reaction
Periodic change
Hydrogen and chlorine combine together to fromhydrochloric acid when exposed to sunlight. This type of reactions are called
Photochemical reactions
Electrochemical reactions
Physical changes
Periodic changes
Physical changes require _________ energy than chemical changes
Less
More
Equal amount of
Very high amount of
