Answer:

Explanation:
You calculate the energy required to break all the bonds in the reactants.
Then you subtract the energy needed to break all the bonds in the products.
2H₂ + O₂ ⟶ 2H-O-H
Bonds: 2H-H 1O=O 4H-O
D/kJ·mol⁻¹: 436 498 464

Answer:
Explanation:
Did you get the answer to the test, I have the same one but don’t understand the questions that well
1.b
2.b
3.a
3 was the the opposite of the scenario stated
Chromium sulfate.
Cr is chromium, and SO4 is sulfate.
Answer:
The process of selection conducted under human direction.
Explanation:
For example, by allowing only like individuals to breed, breeders have created the great variety of dog breeds and crop plants