Select any of the following statements that accurately describe the influence of
ID: 517929 • Letter: S
Question
Select any of the following statements that accurately describe the influence of a catalyst on a chemical reaction.
Question options:
Lowers Ea in both the forward and reverse direction.
Lowers H in both the forward and reverse direction.
Increases reaction rate.
Lowers Ea only in the forward direction.
Lowers H only in the forward direction.
Use the graph shown above to estimate H for the reaction.
___200___
Use the graph shown above to estimate Ea for the reaction.
___100___
Describe the three postulates of collision theory.
- No text entered -
Given the two reaction energy diagrams above. Does the diagram on the left or right represent the faster chemical reaction?
___right___
Given the two reaction energy diagrams above. Does the diagram on the left or right represent the more favorable chemical reaction?
___left___
Write the chemical formulas of the conjugate acid or base as indicated for the species below. Use superscripting/subscripting as needed.
Conjugate base of H2PO4-
Conjugate acid of HSO4-
Conjugate base of NH3
Conjugate acid of NH3
Conjugate base of H2PO4-: HPO24-
Conjugate acid of HSO4-: SO24-
Conjugate base of NH3: NH4+
Conjugate acid of NH3: NH4+
At 25 °C, what is the hydroxide ion concentration, [OH-], in an aqueous solution with a hydrogen ion concentration, [H+] = (4.030x10^-5) M?
Answer:
At 25 °C, what is the pH of an aqueous solution with a hydrogen ion concentration, [H+] = (4.5x10^-5) M?
Answer:
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half remains unreacted.
If (3.230x10^-1) moles of a monoprotic weak acid (Ka = (6.2x10^-5)) is titrated with NaOH, what is the pH of the solution at the half-equivalence point?
Answer:
What is the pH of a 1.6 M solution of HCl?
Answer:
For the following reaction:
Fe2O3 + 3CO -> 2Fe + 3CO2
assign oxidation states to each element on each side of the equation.
Iron as reactant:
________
Iron as product:
________
Oxygen as reactant:
________
Oxygen as product:
________
Carbon as reactant:
________
Carbon as product:
________
Consider a galvanic cell in which Al3+ is converted to elemental aluminum and magnesium metal is converted to Mg2+. Write the balanced half-cell reactions that take place at the cathode and at the anode. Use subscripts and superscripts as needed.
Cathode half-reaction:
Anode half-reaction:
Discuss the similarities and differences between electrolytic and galvanic cells.
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Match each electrochemical cell type with a real-world application of that type of cell.
Mobile source of electricity (battery).
Electroplating automobile parts with chromium.
Electrochemical Cell
Galvanic Cell
Lowers Ea in both the forward and reverse direction.
Lowers H in both the forward and reverse direction.
Increases reaction rate.
Lowers Ea only in the forward direction.
Lowers H only in the forward direction.
Explanation / Answer
Ans 12) it lowers activation energy for both forward and reverse reaction
Ans 13) delta H = energy of products - energy of reactants
from graph 150 kJ/mol -100 kJ/mol = 50 kJ/mol
threshold energy needed for reaction to happen = 200(transition state) - 100 at ground state
= 100 kJ/mol
Ans 14)
Ans 15) the reaction which has lower activation energy forms product faster left one is faster.
but most favourable reaction depends on thermodynamics hence change in energy of reactant and product matters more
most favourable reaction is right one. also energy has to be provided to left for continuous reaction
please ask rest of the questions seperately thanks
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