In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom ? True Or False

Chemistry

1 answer:

Liono4ka [1.6K]3 years ago

6 0

True,I think.(so don't really count on my answer sorry :D)

You might be interested in

The half-life of 131I is 8.021 days.What fraction of a sample of 131I remains after 24.063 days

Leno4ka [110]

24.063/8.021 = 3 half lives
(1/2)^3 =1/8

5 0

3 years ago

Which liquid has the highest vapor pressure at 75°C?

Temka [501]

Answer:

1) Ethanol

Explanation:

If we will have interactions we will need more energy to break them in order to go from liquid to gas. If we need more energy, therefore, the temperature will be higher.

In this case, we can discard the propanone because this molecule don't have the ability to form hydrogen bonds. (Let's remember that to have hydrogen bonds we need to have a hydrogen bond to a heteroatom, O, N, P or S).

Then we have to analyze the hydrogen bonds formed in the other molecules. For ethanol, we will have only 1 hydrogen bond. For water and ethanoic acid, we will have 2 hydrogen bonds, therefore, we can discard the ethanol.

For ethanoic acid, we have 2 intramolecular hydrogen bonds. For water we have 2 intermolecular hydrogen bonds, therefore, the strongest interaction will be in the ethanoic acid.

The closer boiling point to the 75ºC is the ethanol (boiling point of 78.8 ºC) therefore these molecules would have enough energy to break the hydrogen bonds and to past from liquid to gas.