Answer:
The second option is correct
= Acid can dissolve many metals
Explanation:
Acid reacts with most metals to liberate hydrogen gas, during the process the metals dissolve in the acid
1) gain
(just remember this OIL-Oxidation Is Loss and RIG-Reduction Is Gain)
2) decrease
Answer:
Here's what I get
Explanation:
1. Addition of heat
The energy stored in the reactant is less than the energy stored in the products.
We had to add heat energy so the reactant would convert to products.
2. Balanced equation
CaCO₃ + heat ⟶ CaO + CO₂