SBQ 1 Revision (Module 6.2 and 6.3)

Which of the following is a substance that lowers the activation energy?

• ion

• reactant

• catalyst

• substrate

which statement is true of chemical equations?

• reactants are on the right

• products are on the right

• products have fewer atoms than reactants

• reactants have fewer atoms than products

which describes an exothermic reaction?

• they release energy

• they create energy

• they require energy

• they destroy energy

in which of the following are bonds broken and new bonds formed?

• chemical reactions

• elements

• isotopes

• polar molecules

which of the following decreases enzyme activity by binding to the active site?

• inhibitors

• catalysts

• substrates

• pH

Which of the following factors influence enzyme activity? (select all that apply)

• pH

• temperature

• whether the reaction is endothermic or exothermic

• activation energy

• time of the day

How do enzymes affect a chemical reaction, making it easier to occur?

• they make the reaction exothermic

• they reduce the activation energy

• they make the reaction endothermic

• they raise the activation energy

use the figure to answer the question: which of the following does the arrow labeled with the letter X represent?

• free energy

• lost energy

• reactant energy

• activation energy

which of the following is the correct definition of the energy labeled with the letter X?

• the free energy change, which determines spontaneity of the reaction

• the minimum energy required to start the reaction

• the potential energy of the products

• the total energy change of the reaction

the graph shows an _______ reaction since a net amount of energy is ________

• endothermic, released

• exothermic, absorbed

• endothermic, absorbed

• exothermic, released