SCIENCE
PHYSICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Muddy water
|
|
|
Table salt
|
|
|
Whole milk
|
|
|
Maple syrup
|
Detailed explanation-1: -Table salt (sodium chloride) cannot be separated by physical means and has a constant chemical composition. Hence, all the above examples are pure substances.
Detailed explanation-2: -Ordinary table salt is called sodium chloride. It is considered a pure substance because it has a uniform and definite composition.
Detailed explanation-3: -Common salt is a compound made up of Sodium and chlorine atom. These elements are combined chemically in a fixed ratio to form Common salt. We can not separate these components easily by physical means.
Detailed explanation-4: -All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.
Detailed explanation-5: -Salt is made of the element sodium (Na) and chlorine (Cl). These elements are bonded together by an ionic bond. Once bonded, these once harmful elements make table salt or NaCl. Other examples of pure substances that are compounds are oxygen (O2) and water (H2O).