Science study guide
How many molecules of o2 are needed to balance the equation?
3
What type of substance is MnO2
A catalyst
A double replacement reaction
AB + CD --> AD + CB
When silver nitrate solution is added to salt water, a reaction occurs and a milky white precipitate forms. Which statement correctly describes how the rate of this reaction can be influenced?
An increase in the temperature of the salt water will increase the frequency and energy of collisions
Which describes the difference between endothermic and exothermic chemical reactions?
Energy is absorbed in endothermic reactions but is released in exothermic reactions
Which of the following describes an exothermic reaction but not an endothermic reaction?
Energy is released as heat during the reaction
How can the reaction rate be increased for a reaction between hydrogen gas and chlorine gas?
Increase the concentration of either or both reactant molecules
Which will cause an increase in the rate of the above reaction?
Increasing the concentration of Br2
Which procedure will cause a decrease in the rate of reaction?
Increasing the volume inside the reaction chamber
Which of the following conclusions about the reaction is supported by the graph?
It is a endothermic reaction
How does the addition of a catalyst to a reaction alter the reaction?
It lowers the energy required to make the reaction occur
A catalyst can speed up the rate of a given chemical reaction by
Lowering the activation energy required for the reaction to occur
Which of these is a valid conclusion based on the results of Corey's experiment?
The chemical always heats water to the same temperature
Which of the following statements describes all exothermic reactions?
The energy of the reactants is higher than the energy of the products
Which would most likely happen if the scientist placed the powdered sample into a different beaker of water?
The same reaction would occur but at a faster rate
Why does the rate of a chemical reaction increase when the S/A of a reactant is increased?
When the S/A increases, the number of particle collisions increases
