Answer:
The answer is A. Polar covalent; negatively
Explanation:
Hydrogen bonds form between molecules containing polar covalent bond the hydrogen bond is been a hydrogen atom of one molecule and a partially negative charged atom of another.
Example
(water):- It contain a slight positive charge on one side and a slight negative charge on the other.
Answer:
A
Explanation:
water molecules are combined to make food
Answer: 63.26%
Explanation:
If we let the abundance of the first isotope be x, then:

Which is equal to <u>63.26%</u>
2.5X20=50g
50g should be the right answer
Mass=volumeXdenisty.