Question

Every time the compound is contaminated the melting range will go up.

Group of answer choices

True

False

Answer 1

Melting point (MP) of a compound(solid) is the temperature at which its melts. The melting point is a very important physical property of that compound and is used to identify purity of that substance.

In practice, a pure solid usually melts over a very narrow range of temperatures rather than at one particular point.

For this reason, often melting range of a compound is reported rather than melting point.

Though the term "melting point" is generally used, what is meant by that is "melting point range".

When another substance is mixed with a pure compound, two things changes; first, the temperature at which this mixture starts melting is lower than the pure compound; second, the mixture melts over a wide range.

Generally, pure compounds melts within a range of 2°C, greater than 2°( usually 4 °C or more) is considered to be wide.

Hence, for impure compounds, the melting range is wider than pure compounds.

Hence, every time the compound is contaminated the melting range will go up.

So this is a True statement.

To summarize, an impure solid(contaminated compound) melts over a wide range and at a temperature lower than that of the pure solid.