Share 4.3 Chemical Reactions – Biology A
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What happens during a chemical reaction?
Atoms disappear
Atoms are rearranged to form new substances
Energy is destroyed
Only physical changes occur
What are substances that start a chemical reaction called?
Compounds
Elements
Products
Reactants
What are substances formed in a chemical reaction called?
Compounds
Reactants
Products
Mixtures
Which type of change forms a new substance?
Phase change
Chemical change
Mixture
Physical change
Which law states that matter cannot be created or destroyed?
Theory of Relativity
Law of Conservation of Matter
Law of Thermodynamics
Newton’s Law of Motion
What does a balanced chemical equation show?
Atoms disappear
New elements are made
Energy is lost
Mass is conserved
What is the general equation for an endothermic reaction?
Reactants + Energy → Products
Reactants → Products + Energy
Products → Reactants + Energy
Energy → Reactants + Products
What is the general equation for an exothermic reaction?
Products → Reactants + Energy
Reactants + Energy → Products
Reactants → Products + Energy
Energy → Products + Reactants
What is activation energy?
Energy needed to start a reaction
Total energy in products
Energy released after a reaction
Energy stored in bonds
What are reactions that release energy called?
Endothermic reactions
Enzymatic reactions
Exothermic reactions
Mechanical reactions
What are reactions that absorb energy called?
Physical reactions
Endothermic reactions
Exothermic reactions
Enzymatic reactions
What is a biochemical reaction?
A physical reaction outside cells
A nuclear reaction
A chemical reaction inside living cells
A mixture of compounds
What is metabolism?
Only digestion reactions
Sum of all biochemical reactions in an organism
Only endothermic reactions
Movement of energy through space
What are exothermic reactions in organisms called?
Anabolic reactions
Metabolic reactions
Endothermic reactions
Catabolic reactions
What are endothermic reactions in organisms called?
Catabolic reactions
Exothermic reactions
Anabolic reactions
Neutral reactions
What are enzymes?
Acids found in the stomach
Energy sources in cells
Biological catalysts that speed up reactions
Chemicals that slow down reactions
