Answer:
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<h3><u>Question:</u><u>-</u></h3>
Criteria for purity of organic solid is
(a) boiling point
(b) melting point
(c) specific gravity
(d) none of these
<h3><u>Answer</u><u>:</u><u>-</u></h3>
(b) melting point
<h3><u>Explanation</u><u>:</u><u>-</u></h3>
Melting point is considered to be the best measure of purity of a substance.
When a purified sample is mixed with a small amount of pure compound , melting point of the mixture is determined.
If a substance is impure (contains impurities/other substance) the melting point of that substance will change.
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The purity percentage of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample and multiplying this number by 100.
[Mass of pure chemical/total mass × 100]
Answer:
Electromagnetic spectrum
Explanation:
Telescopes are used by observers to monitor various electromagnetic radiation. Only one component of the visible radiation can be observed by each type of instrument. Telescopes, ultraviolet telescopes, optical celestial objects, and other types of telescopes are available.
Weathering is everywhere. An example of physical weathering would be a river flowing on rocks slowly over time the rock will wear down and an example of chemical weathering is acid rain aka the rust on a car.
Answer:
2
Explanation:
The subscript on Ammoniumwhich is (NH4) is 2.
Hope this helped!