Answer:
A. 19
B. 40
C. - 1
Explanation: Please see attachment for explanation
When air is hot, the the particles move much faster and when the air is cold the particles slow down as they are condensing
Explanation:
Whenever there occurs a decrease in the density of a substance then this is known as rarefaction.
For example, when particles of a gas become more dispersed or spread out then it means they have gained more kinetic energy. As a result, there will occur a decrease in mass of the gas and increase in volume of the gas.
As density is mass divided by volume. Hence, decrease in mass will also lead to a decrease in density of the gas.
Therefore, we can conclude that when the molecules in the air become less dense (as in the process of hearing), rarefaction has occurred.
Seven diatomic elements are H₂, Cl₂, N₂, F₂, Br₂, I₂ and O₂.
<h3>Which are diatomic molecules?</h3>
Diatomic molecules are those molecules in which two atoms of same elements are present, and they are combined to attain the stability.
The seven diatomic molecules which are exist in the chemistry are:
- Hydrogen gas (H₂)
- Chlorine gas (Cl₂)
- Nitrogen gas (N₂)
- Fluorine gas (F₂)
- Bromine gas (Br₂)
- Iodine gas (I₂)
- Oxygen gas (O₂)
Hence H₂, Cl₂, N₂, F₂, Br₂, I₂ and O₂ are 7 diatomic molecules.
To know more about diatomic molecules, visit the below link:
brainly.com/question/14466404
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There are several different kinds of indicator electrodes. Several metals, such as silver, copper, lead, cadmium, and mercury, will participate in a reversible electron exchange and can serve as indicator electrodes for their ions.
