Answer:
d
Explanation:
they either gain valence electrons or share them depending on what elements or compound they are reacting with
First fine the formula weight for <span>CaCO₃ by adding the atomic mass of each atom - Ca (40.078g) + C (12.0107g) + O * 3 (15.9994g * 3) = 100.0869g
Take the mass of each individual atom type, divide by the overall mass (100.0869g) and multiply by 100 to find the percent composition of each atom type.
(40.078g)/(100.0869g) * 100 = 40.042%
(12.0107g)/(100.0869g) * 100 = 12.0003%
(15.9994g * 3)/(100.0869g) * 100 = 47.9565%</span>
Because it means the iron is becoming very weak. The more rust = weaker
Answer:
The answer to your question is below
Explanation:
See the attachment.
Synthesis ΔH
ΔH = 25 - (-30) = 25 + 30 = 55 kJ Endothermic reaction
Single reaction
ΔH = 30 - 65 = -35 KJ Exothermic reaction
Double reaction
ΔH = 60 - 10 = 50 kJ Endothermic reaction