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