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Factors Affecting the Rate of Chemical Reactions - Section 6.2 Quiz
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Why does increasing the temperature of the reactants increase the rate of a chemical reaction?
Heat energy causes the particles of the reactants to move faster, and therefore react with each other more frequently
Heat energy causes some of the reactants to evaporate, increasing the concentration of the reactants
Heat energy helps to lower the amount of overall energy that is required for the reaction to occur
Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently
Which of the following would decrease the amount of time a glow stick would stay bright?
Increase the temperature of the reactants
Increase the size of the glowstick
Decrease the temperature of the reactants
Decrease the concentration of one of the reactants
Why are many types of food stored in refrigerators?
The lower temperatures cause the chemical reactions that spoil food to occur more slowly than usual
Bacteria do not grow well in dark places
The volume inside the refrigerator decreases the concentration of the food particles, allowing them to decompose more slowly
Refrigerators often contain enzymes that slow the rate of food spoiling reactions
Which of the following would cause the rate of a chemical reaction to slow?
Increase the volume that the reactants take up
Increase the concentration of the reactants
Increase the temperature of the reactants
Increase the surface area of the reactants
The “burning splint” test is a procedure in a chemistry lab to test for the presence of oxygen. Here, steel wool is used instead of burning splint:
To view images for this question, please refer Figure 6.16 at the bottom of page 275 of the BC Science 10 print student resource. Due to copyright we are unable to show the images.
What concept does the burning splint test illustrate?
Increasing concentration increases reaction rate
Increasing temperature increases reaction rate
Increasing surface area increases reaction rate
Increasing volume increases reaction rate
Which of the following methods for increasing the rate of chemical reaction increases the effectiveness of the interactions between reactants, instead of just causing the reactant molecules to bump into each other more frequently?
Adding a catalyst to the reactants
Increasing the temperature of the reactants
Increasing the concentration of the reactants
Increasing the surface area of the reactants
Iron is a metal that is reactive enough to burn, under the right conditions.
To view images for this question, please refer Figure 6.16 at the bottom of page 275 of the BC Science 10 print student resource. Due to copyright we are unable to show the images.
Double replacement; The surface area is so large that the iron can ignite and burn under the right conditions
Double replacement; There is a high concentration of iron, allowing the combustion reaction to take place
There are catalysts on the iron that allow the reaction to occur
The temperature of the iron is low enough that a reaction can occur
Enzymes are an important component in the human body. Without enzymes, many chemical reactions could not occur, or would react much too slowly to be useful.
What are enzymes?
Catalysts
Chemicals that increase surface area
Molecules used to increase concentration
Simple elements
A chemical reaction between two substances is occurring in an aqueous solution. What can be done to increase the rate of reaction?
Increase the concentration of the reactants by adding more to the solution
Pour the reactants into a large, flat container to increase the surface area
Rapidly cool the container that the reactants are in
Add a catalytic converter
The process of rusting is actually the oxidation of iron, producing iron oxides.
Why does a coating of oil slow the oxidation of iron?
The oil stops oxygen from reaching the iron, and therefore decreases the concentration of oxygen in the rusting reaction
The oil cools the chain so that the rusting reaction occurs much slower
The oil’s surface decreases the surface area of the chain, slowing the rusting reaction
The oil is an “anti-catalyst”, which actually causes the opposite reaction to occur (“anti-rusting”)
