Changes in chemistry

(3/-1) When heated at standard atmospheric pressure, solid dry ice sublimes to this gas without becoming a liquid.5881
(6/-2) To change a mixture into components with different boiling points, use the fractional form of this process of separating liquids through evaporation and condensation.57010
(9/-3) The Haber process combines two elemental gases to create this product, also a gas.31432
(12/-4) The heat a chemical reaction produces is measured by a change in this quantity, symbolized H.20245
(15/-5) This is the term for the minimum amount of energy that must be supplied for a reaction to occur; a catalyst can lower it.23341

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