Answer:
C. Neither
Explanation:
According to the periodic table, Hydrogen is in group 1 and period 1. Beryllium is in group 2, period 2.
The boiling points of alkanes increases with increasing number of carbons. This is because the intermolecular attractive forces, although individually weak, become cumulatively more significant as the number of atoms and electrons in the molecule increases.
So therefore your answer choice will increase. (B)
To make food for the plant
Answer: The coefficient we should change first is for
.
Explanation:
The given reaction equation is as follows.

Here, number of atoms present on reactant side are as follows.
- Al = 1
- Ni = 1
= 2
Number of atoms present on the product side are as follows.
- Al = 1
- Ni = 1
= 3
To balance this equation, multiply Al by 2 and
by 3 on reactant side. Also, multiply
by 2 and Ni by 3 on the product side.
Hence, the equation can be rewritten as follows.

Now, number of atoms present on reactant side are as follows.
- Al = 2
- Ni = 3
= 6
Number of atoms present on product side are as follows.
- Al = 2
- Ni = 3
= 6
Since, the atoms on both reactant and product side are same. Hence, it is now a balanced chemical equation.
Thus, we can conclude that the coefficient we should change first is for
.