Question

Which ones do not have a definite boiling point ? a)salty water,oil+water    b)none           c)Fe,C           d)HCl       e)Fe,C,HCl                ​

Answer 1

Ответ:

A)

Ето правилни

Answer 2

The substances that do not have a definite boiling point are typically mixtures, solutions, or substances that undergo decomposition or vaporization over a range of temperatures. Let's analyze the options:

a) Salty water and oil+water: Both of these are mixtures and do not have a single definite boiling point. The boiling point of salty water, for example, will depend on the concentration of salt in the water.

b) None: This option suggests that all substances mentioned have a definite boiling point, which is not accurate.

c) Fe (iron) and C (carbon): Both iron and carbon are pure elements, and they have definite boiling points. Iron has a boiling point of approximately 2861°C, and carbon sublimates (changes directly from solid to vapor) at various temperatures depending on the form (graphite, diamond, etc.).

d) HCl (hydrochloric acid): Hydrochloric acid is a pure compound, and it has a definite boiling point, which is approximately -85°C.

e) Fe, C, and HCl: As mentioned earlier, both iron and hydrochloric acid have definite boiling points. Carbon can sublimate at various temperatures, but it still undergoes a phase change from solid to vapor.

So, the substances that do not have a definite boiling point are a) salty water and oil+water.