Regents Chem Heats of Reaction

If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there will be no effect on the

• rate of the forward reaction
• activation energy of the reaction
• rate of the reverse reaction
• heat of reaction

Two reactant particles collide with proper orientation.The collision will be effective if the particles have

• high activation energy
• high ionization energy
• sufficient kinetic energy
• sufficient potential energy

Adding a catalyst to a chemical reaction changes the rate of reaction by causing

• a decrease in the activation energy
• an increase in the activation energy
• a decrease in the heat of reaction
• an increase in the heat of reaction

A piece of Mg(s) ribbon is held in a Bunsen burnerflame and begins to burn according to the equation:
2Mg(s) + O2 (g)  −>   2MgO(s).
The reaction begins because the reactants

• are activated by heat from the Bunsen burner flame
• are activated by heat from the burning magnesium
• underwent an increase in entropy
• underwent a decrease in entropy

Tags

NGSS.HS-PS1-5

Compared to the rate of inorganic reactions, the rate of organic reactions generally is

• slower because organic particles are ions
• slower because organic particles contain covalent bonds
• faster because organic particles are ions
• faster because organic particles contain covalent bonds

Tags

NGSS.HS-PS1-5

When one mole of a certain compound is formed from its elements under standard conditions, it absorbs 85 kiloJoules of heat. A correct conclusion from this statement is that the reaction has a

• ΔH equal to –85 kJ/mole
• ΔH equal to +85 kJ/mole
•  Δequal to –85 kJ/mole
•  Δequal to +85 kJ/mole

Tags

NGSS.HS-PS3-1

Which interval represents the activation energy of the forward reaction?

• A
• B
• C
• E

Tags

NGSS.HS-PS1-4

Which interval represents the heat of reaction for the reaction?

• A
• B
• D
• E

Tags

NGSS.HS-PS1-4

Interval C in this potential energy diagram could be changed by adding a ________?

• Cookies
• More energy
• Catalyst
• Changing the temperature

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Given the reaction:
CH4(g) + 2 O2(g)  2 H2O(g) + CO2(g)
What is the overall result when CH4(g) burns according to this reaction?

• Energy is absorbed and H is negative.Δ
• Energy is absorbed and ΔH is positive.
• Energy is released and ΔH is negative.
• Energy is released and ΔH is positive

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1