Kinetics 1

Based on Table I, which equation represents a reaction with the greatest difference between the potential energy of the products and the potential energy of the reactants?

• 4Al(s) + 3O₂(g) →2Al₂O₃(s)

• 2H₂(g) + O₂(g) → 2H₂O(l)

• C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)

• C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

Hydrochloric acid reacts faster with powdered zinc than with an equal mass of zinc strips because the greater the surface area of the powdered zinc

• decreases the frequency of particle collisions

• decreases the activation energy of the reaction

• increases the frequency of particle collisions

• increases the activation energy of the reaction

Based on Table I, which compound dissolves in water by an exothermic process?

• NaCl

• NaOH

• NH₄Cl

• NH₄NO₃

In chemical reactions, the difference between the potential energy of the products and the potential energy of the reactants is equal to the

• activation energy

• ionization energy

• heat of reaction

• heat of vaporization

Under the collision theory, the particles must collide with  ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy
• sufficient surface area and correct orientation
• sufficient catalyst and sufficient energy
• sufficent energy and correct orientation

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5

Grinding a seltzer tablet into powder increases the rate of reaction due to...

• increased concentration of reactants
• increased surface area
• increased speed of particles.
• better orientation of reactants

Tags

NGSS.HS-PS1-5

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

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

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

• ΔT equal to –85 kJ/mole

• ΔT equal to +85 kJ/mole