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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
Which type of change forms a new substance?
Physical change
Mixture
Chemical change
Phase change
Which law states that matter cannot be created or destroyed?
Theory of Relativity
Law of Thermodynamics
Law of Conservation of Matter
Newton’s Law of Motion
What are substances that start a chemical reaction called?
Reactants
Elements
Compounds
Products
What are substances formed in a chemical reaction called?
Products
Mixtures
Compounds
Reactants
What is activation energy?
Energy needed to start a reaction
Energy released after a reaction
Total energy in products
Energy stored in bonds
What are reactions that release energy called?
Enzymatic reactions
Endothermic reactions
Mechanical reactions
Exothermic reactions
What are reactions that absorb energy called?
Catabolic reactions
Exothermic reactions
Endothermic reactions
Physical reactions
What is the general equation for an exothermic reaction?
Products → Reactants + Energy
Reactants + Energy → Products
Energy → Products + Reactants
Reactants → Products + Energy
What is a biochemical reaction?
A chemical reaction inside living cells
A nuclear reaction
A physical reaction outside cells
A mechanical process
What are exothermic reactions in organisms called?
Metabolic reactions
Neutral reactions
Anabolic reactions
Catabolic reactions
What are endothermic reactions in organisms called?
Anabolic reactions
Exothermic reactions
Catabolic reactions
Neutral reactions
What are enzymes?
Chemicals that slow down reactions
Acids in the stomach
Energy sources in cells
Biological catalysts that speed up reactions
How do enzymes speed up reactions?
They lower activation energy
They increase temperature
They remove products
They add more reactants
What happens if enzymes lose their shape?
They change into products
They become denatured and stop working
They make new enzymes
They work faster forever
What affects enzyme activity?
Temperature and pH
Size and color
Light and sound
Gravity and speed
