Answer:
It absorbs ultraviolet (UV) radiation from the sun.
Explanation:
Excess UV radiation damages DNA, causing malignant skin cancers.
The ozone in the upper atmosphere is beneficial because it absorbs much of this harmful radiation.
Answer:
equals
Explanation:
<h3>it means that forward reaction equals to reverse reaction</h3>
The number above the symbol is the atomic mass (or atomic weight). This is the total number of protons and neutrons in an atom. The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number.
When the element is reduced it gains electrons, maybe it's charge becomes more negative.
<u>Answer: </u>The volume occupied by 
at STP is 0.56 L.
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
We are given:
Given mass of oxygen = 0.80 g
Molar mass of oxygen = 32 g/mol
Putting values in above equation, we get:
<u>At STP:</u>
1 mole of a gas occupies 22.4 L of volume.
So, 0.025 moles of oxygen gas will occupy = 
of volume.
Hence, the volume occupied by at STP is 0.56 L.
