An enzyme can affect a chemical reaction by bringing the reactant closer together - chemical bonds may be weakened, and reactions will happen faster than without a catalyst. The energy can also be lowered, which means reactions will proceed at a lower temperature, light presence, etc.
Answer:
c because they are the closest together
Answer: Chemical composition modification (or, physical signal would be color).
Answer:
A simple solution is prepared by dissolving a solute species of known mass into a liquid solvent of known volume. In the prepared solution there is a certain total number of solute moles dissolved in a certain total solution volume in liters. known as Molarity.
This is an aqueous solution where ammonium sulfate is the solute. It is a salt compound that fully dissociates to provide twice the ammonium cation molarity:
(NH₄)₂SO4(s) → 2NH₄⁺ (aq) + SO2₄⁻(aq)
From the required ammonium cation molarity, the required compound molarity will be:
[NH₄⁺]=0.150M
[(NH₄)₂SO₄]= 0.150 M÷2=0.0750M
We multiply this molarity by the given solution volume to get the ammonium sulfate moles required:
N compound = 0.25000L×0.0750 M
=0.0188 mol
We multiply these moles by the known ammonium sulfate molar mass to get the mass in grams:
M compound= 0.0188 mol×132.14gmol
=2.48g
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