Answer:
b. snake and earthworm
Explanation:
embryos are different from each other in early stages- all the others look similar
<u>Answer:</u> The change in entropy for the system is 140.3 J/K
<u>Explanation:</u>
The chemical equation follows:
To calculate the entropy change for vaporization of methanol, we use the equation:
where,
= entropy change of the reaction
n = number of moles = 1.00 mole
= heat of vaporization = 35.21 kJ/mol = 35210 J/mol (Conversion factor: 1 kJ = 1000 J)
T = temperature of the system =
Putting values in above equation, we get:
Hence, the change in entropy for the system is 140.3 J/K
Answer:
D. 2NH₃(g) ⟶ N₂(g) + 3H₂(g)
Explanation:
A chemical equation must show the correct formulas for reactants and products.
A and B are wrong, because they have NH₃ as a product.
C is wrong. H₃ does not exist.
A is correct. The equation for the decomposition of ammonia is
2NH₃(g) ⟶ N₂(g) + 3H₂(g)
It;s a physical change because the tablet dissolved and it made the water cooler