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Answer:
C) Reactants absorb a minimum amount of energy and then release a smaller
amount of energy as products form.
Explanation:
The statement that best describes how to read a reaction pathway from the graph of an endothermic reaction is that, reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
In an endothermic change, heat is absorbed from the surrounding.
- As such, the surrounding becomes colder at the end of the reaction.
- On a graph of an endothermic reaction, the reactants absorbs a minimum energy.
- As the reaction proceeds, the products gives off an even lesser amount of energy.
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So what don't you understand. The whole page
Answer:
[OH⁻] = 1.1 × 10⁻³ M
Explanation:
<em>An aqueous solution at 25°C has a H₃O⁺ concentration of 8.8 × 10⁻¹² M. Calculate the concentration of OH⁻. Be sure your answer has 2 significant digits.</em>
<em />
Step 1: Given data
Concentration of H₃O⁺ ([H₃O⁺]): 8.8 × 10⁻¹² M
Concentration of OH⁻ ([OH⁻]): ?
Step 2: Calculate the concentration of OH⁻
Let's consider the self-ionization of water.
2 H₂O(aq) ⇄ H₃O⁺(aq) + OH⁻(aq)
The equilibrium constant for this reaction is:
Kw = [H₃O⁺] × [OH⁻] = 1.0 × 10⁻¹⁴
[OH⁻] = 1.0 × 10⁻¹⁴ / [H₃O⁺]
[OH⁻] = 1.0 × 10⁻¹⁴ / 8.8 × 10⁻¹²
[OH⁻] = 1.1 × 10⁻³ M
