Match each vocabulary word with its definition. match the items in the left column to the items in the right column. 1. the amount of heat released or absorbed by a reaction heat of reaction 2. the change in enthalpy (heat content) that occurs in the process of converting reactants to products in a chemical reaction specific heat 3. a reaction which absorbs heat from the surrounding space exothermic reaction 4. a reaction which gives up heat to the surrounding space endothermic reaction 5. the amount of heat required to raise the temperature of one gram of a given substance by one degree celsius enthalpy of reaction

the correct answer to this question is 2

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.