GROWTH DEVELOPMENT CHILD
FORMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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elements can be separated by physical means and compounds cannot.
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elements cannot be separated by physical means and compounds can.
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elements contain only one kind of atom and compounds contain more than one kind of atom.
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elements contain more than one kind of atom and compounds contain only one kind of atom.
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Detailed explanation-1: -Elements are pure substances since it contains only one kind of atom. Every element has its unique properties. Atoms of the same element have the same physical and chemical properties. Atoms of different elements have different physical and chemical properties.
Detailed explanation-2: -An atom is the smallest part of an element that can exist. Compounds are formed from elements by chemical reactions. Compounds contain two or more elements chemically combined in fixed proportions and can be represented by formulae using the symbols of the atoms from which they were formed.
Detailed explanation-3: -Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. There are nearly 118 elements (at present) of which nearly 94 occur naturally on Earth.
Detailed explanation-4: -A compound contains atoms of different elements chemically combined together in a fixed ratio. Anelement is a pure chemical substance made of same type of atom. Compounds contain differentelements in a fixed ratio arranged in a defined manner through chemical bonds.
Detailed explanation-5: –Chemical compound is a chemical substance which is made up of many identical molecules and those molecules consist of atoms of more than one element held together by different types of chemical bonds.-So, the molecules need to be made up of more than one type of elements in the case of compounds.