3. Which of the following statements is TRUE about elements and compounds?
A Are homogenous in nature,
B. Are simplest form of matter
C. Are commonly naturally occurring materials.
D. Can be broken down into sinpler substances.
Answers
Answer:
All the options are True about elements and compounds.
Answer:
(A) Are homogenous in nature
Explanation:
Explanation for correct answer:
(A) Are homogenous in nature
Pure substances can be further classified into elements and compounds (both are homogeneous in nature).
The compounds are always homogeneous, i.e. all the components of compounds are similar in composition and have the same properties throughout.
Chemical elements can be homogeneous. Homogeneous elements are for example: nitrogen in a balloon, mercury in a thermometer or gold in an ingot.
Therefore, option (A) is correct.
Explanation for incorrect options:
(B) Are simplest form of matter
Elements are the most basic form of matter as they can't be broken down anymore, either physically or chemically whereas compounds are made up of two or more elements which are joined together by chemical bonds in certain amounts and proportions and can be further broken down into simpler forms.
So, elements are the basic form of matter and compounds are not.
Therefore, option (B) is incorrect.
(C) Are commonly naturally occurring materials
Elements 1 to 92 (except for elements 43 and 61) occur naturally on Earth, although some are only present in extremely small quantities. The elements following uranium on the periodic table are only produced artificially, and are known as the transuranium or transuranic elements.
A chemical compound is defined as naturally occurring if it is purified or concentrated using heat to remove uncombined water. For example: drying a wet clay or mineral, where moisture is not chemically bound to the substrate.
Elements and compounds can occur naturally but they can made artificially also. So, option (A) is more appropriate.
Therefore, option (C) is incorrect.
(D) Can be broken down into simpler substances.
Elements can not be broken down into simpler forms but compounds can be broken down into simpler forms because compounds are formed from the combination of two or more elements.
Therefore, option (D) is incorrect.
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