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What happens during a chemical reaction?
Energy is destroyed
Atoms disappear
Only physical changes occur
Atoms are rearranged to form new substances
Which type of change forms a new substance?
Chemical change
Physical change
Phase change
Mixture
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 are substances that start a chemical reaction called?
Reactants
Elements
Products
Compounds
What are substances formed in a chemical reaction called?
Mixtures
Reactants
Products
Compounds
What is activation energy?
Energy released after a reaction
Energy stored in bonds
Energy needed to start a reaction
Total energy in products
What are reactions that release energy called?
Endothermic reactions
Enzymatic reactions
Exothermic reactions
Mechanical reactions
What are reactions that absorb energy called?
Endothermic reactions
Physical reactions
Exothermic reactions
Catabolic reactions
What is the general equation for an exothermic reaction?
Products → Reactants + Energy
Reactants → Products + Energy
Reactants + Energy → Products
Energy → Products + Reactants
What is a biochemical reaction?
A physical reaction outside cells
A mechanical process
A chemical reaction inside living cells
A nuclear reaction
What are exothermic reactions in organisms called?
Metabolic reactions
Anabolic reactions
Neutral reactions
Catabolic reactions
What are endothermic reactions in organisms called?
Catabolic reactions
Anabolic reactions
Exothermic reactions
Neutral reactions
What are enzymes?
Energy sources in cells
Biological catalysts that speed up reactions
Acids in the stomach
Chemicals that slow down reactions
How do enzymes speed up reactions?
They add more reactants
They remove products
They lower activation energy
They increase temperature
What happens if enzymes lose their shape?
They become denatured and stop working
They change into products
They make new enzymes
They work faster forever
What affects enzyme activity?
Size and color
Temperature and pH
Light and sound
Gravity and speed
