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Biology Chapter 2 Sections 4-5
Terms in this set (30)
What do chemical reactions change substances into by breaking and forming chemical bonds?
Why are chemical reactions essential for the cells of organisms?
They provide usable energy for their cells
The breakdown of what simple sugar is a prime example of an essential chemical reaction?
The simple sugar: Glucose
What are the two parts of a chemical reaction?
Reactants and products
Which part of a chemical reaction is shown on the left side of a chemical equation? On the right?
What does the arrow in a chemical equation represent?
The direction of the chemical equation
What must happen to bonds in the reactants? What must happen to bonds in the products?
Bonds are broken in the reactants and bonds are formed in the products
What must be added to break bonds in molecules? What is this energy called?
Energy; bond energy
What term is given to chemical reactions that move in both directions at the same time?
The state of a chemical reaction that is at an equal rate of exchange is called what?
What are made at the same rate for chemical reactions in a state of equilibrium?
Reactants and products
What happens to energy during chemical reactions?
Energy is released or absorbed
What is the term given to the energy that must be absorbed by reactants for a chemical reaction to start?
In exothermic reactions, chemical energy is often given off as what two things?
Heat or light
What happens to chemical energy during an endothermic reaction?
Chemical energy is absorbed
What is a common example of an endothermic reaction?
After activation energy starts a chemical reaction, how does the reaction continue?
On its own
⭐️⭐️⭐️⭐️List the two circumstances that would require a chemical catalyst to help a chemical reaction?
When chemical reactions happen again slower than optimal rate or lack enough interaction between reactants
What is the effect of a chemical catalyst on the activation energy needed to start a reaction?
They decrease the activation energy needed
List two things that a chemical catalyst changes in a chemical reaction?
Changes the activation energy and the rate of the reaction
Do enzymes change the direction of a chemical reaction?
Enzymes change the amount of time needed for what to be reached in a chemical reaction?
What type of carbon based molecules do enzymes belong to?
What do enzymes depend on to function properly?
In what type of temperature range do enzymes work best? What PH level?
Small temperature range; neutral PH (7)
What term is given to the specific reactants that enzymes act on?
What are the specific places that substrates temporarily bind to?
What model is used to explained how enzymes work?
Lock and key model
What happens to substrate bonds after enzymes bring substrates together?
The substrate bonds are weakened
What is released from an enzyme after the catalyzed reaction has taken place?
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Biology Chapter 2, Sec 4,5 Study Guide
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