Essential Vocabulary- Unit 3: Reactions

A symbolic representation of a chemical reaction using formulas for reactants and products, along with coefficients to indicate the amounts involved is called a _________.

• Chemical Equation

• Molecular Mass

• Atomic Number

• Periodic Table

How much of a substance is in a space is called _________.

• Concentration

• Temperature

• Volume

• Pressure

A measure of how hot or cold something is; higher temperatures make particles move faster, increasing the chances of a reaction is called _________.

• Temperature

• Pressure

• Volume

• Density

When the concentrations of reactants and products are constant, the system is in _________.

• Equilibrium

• Motion

• Expansion

• Compression

The speed at which a chemical reaction occurs, often influenced by factors such as temperature, concentration of reactants, and the presence of a catalyst, is called _________.

• Reaction Rate

• Activation Energy

• Equilibrium Constant

• Molarity

A substance that increases the rate of a chemical reaction without undergoing any permanent chemical change is called a _________

• Catalyst

• Reactant

• Solvent

• Inhibitor

The minimum energy needed for a reaction to start is called _________

• Activation Energy

• Potential Energy

• Kinetic Energy

• Thermal Energy

A protein that speeds up chemical reactions in living things by lowering the activation energy needed is called an _________.

• Enzyme

• Hormone

• Lipid

• Carbohydrate

A reaction or change where heat is absorbed by the system from the surroundings is called _________.

• Endothermic

• Exothermic

• Isothermal

• Adiabatic

A reaction or change where heat is released by the system into the surroundings is called _________.

• Exothermic

• Endothermic

• Isothermal

• Adiabatic