GK
ELEMENTS COMPOUNDS SUBSTANCES METALS AND NON METALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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pure substance
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substance with varying boiling points
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a substance with varying melting points
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an impure substance due to various elements
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Detailed explanation-1: -Compounds are made of only one kind of molecule. The molecule is made up of two or more kinds of atoms. There is no physical change that can separate the compounds into more than one kind of substance. This makes a compound a pure substance.
Detailed explanation-2: -Elements and compounds are pure substances.
Detailed explanation-3: -Elements and compounds are both examples of pure substances. Compounds are substances that are made up of more than one type of atom. Elements are the simplest substances made up of only one type of atom.
Detailed explanation-4: -Sugar, salt, and baking soda are compounds that are pure substances. Salt, diamonds, protein crystals, and copper sulphate crystals are examples of pure compounds that are crystals. Homogeneous mixtures can be called representations of pure chemicals, depending on who you speak to.
Detailed explanation-5: -(KOM-pownd) In science, a substance made from two or more different elements that have been chemically joined. Examples of compounds include water (H2O), which is made from the elements hydrogen and oxygen, and table salt (NaCl), which is made from the elements sodium and chloride.