Answer:
When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. So B.
Explanation:
When an electron moves from a higher to a lower energy level, energy is released (often as light).
Answer:
The correct option is: It becomes one-half as large.
Explanation:
The energy stored in a capacitor is inversely proportional to the distance between plates.
If the plate separation (distance between plates) is doubled, it means the Energy stored will be halved. That is, the energy stored becames one-half as large.
<u>Answer:</u> D. the ionic compound calcium fluoride
The correct option here is the fourth one.
<u>Explanation:</u>
Salt like compounds addition to water is likely to be inducing certain changes in temperature of freezing into solid and also alter the temperature of boiling.
It is noticed that addition of salts in water mostly tends to get lower the freezing temperatures from the original freezing point of water and among the given 3 options calcium fluoride tends to lower the freezing point most when compared to others.
Thus as vant hoff factor is highest factor for and the freezing point will be lowest.
The answer fam is.......
Different land forms have different combinations of elevation and relief.
Elevation is the height of a feature above sea level.
Relief is the difference between the highest and lowest points in an area.
<u>Answer:</u> The mass of water required is 18.52 g
<u>Explanation:</u>
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
......(1)
Given mass of magnesium hydroxide = 30.0 g
Molar mass of magnesium hydroxide = 58.32 g/mol
Plugging values in equation 1:
The given chemical equation follows:
By the stoichiometry of the reaction:
If 1 mole of magnesium hydroxide produces 2 moles of water
So, 0.5144 moles of magnesium hydroxide will react with = of water
Molar mass of water = 18 g/mol
Plugging values in equation 1:
Hence, the mass of water required is 18.52 g