What is enthalpy (H)?, Pressure of a system, Total heat energy in a substance, Volume of a gas, Speed of particles, What does ΔH represent?, Temperature change, Energy lost only, Change in enthalpy, Mass change, What is an exothermic reaction?, Absorbs heat, Releases heat, No energy change, Freezes, What is the sign of ΔH in an exothermic reaction?, Positive, Negative, Zero, Unknown, What happens to the surroundings in an exothermic reaction?, Cool down, Stay same, Heat up, Freeze

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