20 questions
Which of the following statements is not a requirement for a reaction to occur between reacting particles?
reacting substances must collide
reacting substances must collide with the correct orientation.
reacting substances must be identical to react.
reacting substances must collide with sufficient energy.
The diagram above is showing unsuccessful reaction. Which of the following is not a probable reason for an unsuccessful reaction?
Reactants are moving too slowly
Reactants are not facing each other at the right angle
Reactants do not have sufficient energy
Reactants are in correct orientation.
Which of the following are necessary for successful collisions to occur?
I Favorable collision geometry
II Sufficient Kinetic energy
III Large amount of heat
I only
I and II only
II and III only
I, II, and III
Collision theory states that
All collisions lead to chemical reactions
Most collisions lead to chemical reactions
Very few reactions involve particle collisions
Effective collisions lead to chemical reactions
When a lit match is touched to the wick of a candle, the candle begins to burn. When the match is removed, the candle continues to burn. In this reaction, the match
Behaves as a catalyst
Supplies activation energy
Is part of the rate-determining step
Lowers the activation energy barrier
When you walk through a crowded hallway at school, you are more likely to bump into another person. To which of the following factors that affect rate of reaction is this analogy referring?
catalyst
. surface area
temperature
concentration
Which of the following will lower the rate of reaction?
adding an enzyme to the reaction
decreasing the temperature from 40˚C to 10˚C
breaking a chunk of calcium up into smaller pieces
increasing the amount of solute dissolved in a solution
A student adds iron filings to a copper(II) chloride solution at room temperature. A balanced equation for the reaction that occurs is shown below.
Fe(s) + CuCl2 (aq) = FeCl2 (aq) + Cu(s)
Which of the following changes would most likely increase the reaction rate?
using larger pieces of iron
performing the reaction in an ice bath
increasing the volume of the CuCl2 solution
increasing the concentration of the CuCl2 solution
Which of the following are true about how temperature affects the rate of reaction?
I and II only
I and III only
II and III only
I, II and III
Increasing which of the following will increase the frequency of collisions?
I and II only
I and III only
II and III only
I, II, and III
The graph above shows the differences in
the rate of reaction at different temperatures,
concentrations, surface area, and the presence
or absence of a catalyst. A steeper line represents
a greater rate of reaction. Which of the following
is not associated with Y?
lower temperature
lower concentration
use of a catalyst
larger pieces (small surface area)
Which of the following is not a valid observation after adding 30 ml of Hydrogen Peroxide to 1 tablespoon of yeast?
Production of Carbon Dioxide.
The mixture warmed the flask.
Production of bubbles.
Production of Oxygen.
Which of the following best explains why a glowing splint lighted up after immersing it on top of the bubbles produced by a Hydrogen peroxide and yeast mixture.
Production of carbon dioxide
Production of bubbles
Production of oxygen
Increase in temperature
The following reaction is allowed to reach equilibrium.
3H2(g) + N2(g) ⇌ 2NH3(g)
What happens to the reaction when the volume of the reaction vessel is decreased?
Reaction shifts to the right
Reaction shifts to the left
The reaction is still at equilibrium.
All of the above
Based on the graph below, at what time did the reaction reach equilibrium?
t1
t2
t3
t4
Which of the following is NOT TRUE at equilibrium?
The forward and reverse reactions proceed at the same rate.
The concentrations of reactants and products do not change.
The concentration of the reactants is equal to the concentration of the products.
The forward and reverse reactions continue to occur.
An experiment is conducted to investigate the effect of temperature on the volume of gas collected from a mixture of metal such as Zinc (Zn), Iron (Fe) and Nickel (Ni) with a hydrochloric acid (HCl). The figure below shows the result of the investigation.
If a temperature of 5°C had been tested, would the volume of gas collected for Zn more likely have been greater than 107 mL or less than 107 mL ?
Greater than 107 mL, because for a given metal, the volume of collected gas increased as the temperature decreased.
Greater than 107 mL, because for a given metal, the volume of collected gas increased as the temperature increased.
Less than 107 mL, because for a given metal, the volume of collected gas decreased as the temperature decreased.
Less than 107 mL, because for a given metal, the volume of collected gas decreased as the temperature increased.
Iodine monochloride reacts reversibly with chlorine to form iodine trichloride.
ICl + Cl2 ⇌ ICl3
dark brown yellow
Predict the effect of an increase in concentration on the position of equilibrium:
An increase in the concentration of ICl or Cl2 causes the equilibrium to shift to the _____ so more of the ______ product is formed.
right, yellow
left, dark brown
right, dark brown
left, yellow
Iodine monochloride reacts reversibly with chlorine to form iodine trichloride.
ICl + Cl2 ⇌ ICl3
dark brown yellow
Predict the effect of an increase in concentration on the position of equilibrium:
A decrease in the concentration of ICl or Cl2 causes the equilibrium to shift to the _____ so more of the ______ reactant is formed.
right, yellow
left, dark brown
right, dark brown
left, yellow