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Science differences [2marks]

Nature of Matter: Elements, Compounds, and Mixtures · Gujarat Board (GSEB) STD 8 (GSEB - English Medium). 3 questions.

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differences [2marks]

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Question 12 Marks
State four differences between compounds and mixtures.
Answer
CompoundsMixtures
A compound is a pure substance.A mixture is an impure substance.
Compounds are always homogeneousMixtures may be uniform or non-uniform
Formation of a compound involves a change in energy..Formation of a mixture does not involve any change in energy
Components of compounds can be separated only by complex chemical processes.Components of mixtures can be separated by simple physical methods of separation.
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Question 22 Marks
Differentiate between pure and impure substances.
Answer
Pure SubstancesImpure Substances
Pure substances have a definite chemical composition and definite physical and chemical properties.Impure substances are made up of two or more pure substances mixed in any proportion. They do not have a definite set of properties.
Pure substances are all uniform, i.e., their composition is uniform throughout the bulkImpure substances may be non-uniform or uniform i.e., their composition is not uniform throughout the bulk.
Examples are gold, silver, water, sodium chloride, etc.Examples are air, seawater, a solution of sugar in water, etc.
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Question 32 Marks
Differentiate between elements and compounds.
Answer
ElementsCompounds
1. Elements are a single type of atom.1. Compounds are made up of two or more elements.
2. Elements consist of only one kind of atom2. Compounds consist of two or more different elements chemically combined
3. Elements cannot be broken down into sub-parts.3. Compounds can be broken down into sub-parts
4. Properties depend on the atom type Examples: Hydrogen (H), Iron (Fe) Sulfur (S), etc4. Properties are different from the elements it's made of.Examples: Water (H2O), Methane (CH4), Salt (NaCl), etc.
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differences [2marks] - Science STD 8 Questions - Vidyadip