Answer: if you think about a tree the older rings would be in the middle, so you’d find objects with older age below/under/inside
3. Cl₂ + 2KI --> 2KCl + I₂
Cl = 2 Cl = 2
K = 2 K = 2
I = 2 I = 2
4. 2NaCl --> 2Na + Cl₂
Na = 2 Na = 2
Cl = 2 Cl = 2
5. 4Na + O₂ --> 2Na₂O
Na = 4 Na = 4
O = 2 O = 2
6. 2Na + 2HCl --> H₂ + 2NaCl
Na = 2 Na = 2
H = 2 H = 2
Cl = 2 Cl = 2
7. 2K + Cl₂ --> 2KCl
K = 2 K = 2
Cl = 2 Cl = 2
Explanation:
When a strong acid, say 
reacts which a weak base, say 
, the reaction is shown below as:-
The salt further reacts with water as shown below:-
Formation of 
lowers the pH value of the solution as more hydrogen ions leads to less pH.
The balance chemical equation is
2N2 + O2 ---> 2N2O.
We can solve how many moles of nitrous oxide gas from 1.65 moles of nitrogen gas. The balance equation is a critical information to answer this problem since it gives the ratio of nitrous oxide gas produced to the nitrogen used. 2 moles of nitrous oxide gas is produced from 2 moles of nitrogen gas is used. Hence there is 3.30 moles of nitrous oxide gas produced.
Hope This Helps!
:D
