<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.
Answer: 4 and 6
Explanation: the double bonds are alternating in the chain
C—C=C—C=C—C=C—C=
1 2 3 4 5 6 7 8
Answer: The atomic mass of E is 16
Explanation:Please see attachment for explanation
All of the factors listed above, except food can be classified as abiotic factors. Food (the presence of plants,animals and other organisms in the ecosystem and their complex relationships) is the biotic component of the ecosystem.
These factors affect the distribution, survival and genetic characteristics of the populations. The lack of water, shelter and space can prevent certain species from living in the ecosystem or cause strong pressure of the natural selection and shape the genetic structure of the population.
Complex biotic relationship also influence behavior, presence and genetic structure of the populations.
Answer:
No, and yes. As there is a finite amount of matter in the
universe, only so much can be converted to make energy. There will
be a limit, though it is a long, long way from where we are
Explanation:
