Answer:
They are already matched for you. It goes
1.
2.
3.
in the order of the questions.
Answer: 4000000000
because 20X200000000=4000000000
D. plenty of water
First, the affected area is washed with plenty of water for 15-20 minutes. Then washed with a weak solution of sodium bicarbonate.
H⁺ + HCO₃⁻ → H₂O + CO₂
