Chemistry, 09.09.2021 14:00 10040816

How can you distinguish between a physical change and a chemical change?

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Answer from: madelyngv97

Physical Change

When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.Physical change is a temporary change.A Physical change affects only physical properties i.e. shape, size, etc.A physical change involves very little to no absorption of energy.Some examples of physical change are freezing of water, melting of wax, boiling of water, etc..In a physical change, no new substance is formed.Physical change is easily reversible i.e original substance can be recovered.

Chemical Change

When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances..A chemical change is a permanent change.Chemical change both physical and chemical properties of the substance including its compositionDuring a chemical reaction, absorption and evolution of energy take place.A few examples of chemical change are digestion of food, burning of coal, rusting, etc.A chemical change is always accompanied by one or more new substance(s).Chemical changes are irreversible i.e. original substance cannot be recovered.

Answer from: Quest

They did not study the continental drift

Answer from: Quest

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

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