write short note on (a.) elements and compounds (b.) mixture (c.) chemical and physical changes
Answers
Answer:
a change where a no new substances are formed are called physical changes.
a change where a new substances are formed are called chemical change.
Answer:
(A)Element - An element is a substance whose atom all have the the same number of protons: another way of saying this is that all of a particular elements atom have a same atomic number. elements are chemically the simplest substance and hence cannot be broken down using chemical reactions.Compound - A compound is a material formed by chemically bonding two or more chemical elements. the type of Bond keeping elements in a compounds together may vary : covalent bonds and ionic bonds auto common types fullstop the elements are always present in fixed ratios in any compound.
(B)Mixture - in chemistry a mixture is a material made up of two or more different substances which are physically combined. A mixture is a a physical combination of two or more substances in which the identities are retained and are mixed in the form of solution, Suspension and colloids.
(C)Chemical changes - chemical changes occurs when a substance combine with another two form a new substance called a chemical decomposes into two or more substances . example of a chemical change in the reaction between Sodium and water to produce sodium hydroxide and hydrogen.pPhysical changes - a physical change is a change to the physical
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