indicates a pressure other than STP What is a catalyst A substance that speeds

Indicates a pressure other than stp what is a

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indicates a pressure other than STP What is a catalyst? A substance that speeds up a reaction without being changed by the reaction. Enzymes are biological or protein catalysts. Reaction Energy All chemical reactions are accompanied by a change in energy. Exothermic - reactions that release energy to their surroundings (usually in the form of heat) o ΔH (enthalpy) is negative – energy leaving system o Endothermic - reactions that need to absorb heat from their surroundings to proceed.
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o ΔH (enthalpy) is positive – energy coming into the system Spontaneous Reactions - Reactions that proceed immediately when two substances are mixed together. Not all reactions proceed spontaneously. Activation Energy – the amount of energy that is required to start a chemical reaction. o Once activation energy is reached the reaction continues until you run out of material to react. Formula Equation Uses formulas and symbols to describe a reaction doesn’t indicate how many. All chemical equations are sentences that describe reactions. Diatomic elements There are 8 elements that never want to be alone. They form diatomic molecules. H 2 , N 2 , O 2 , F 2 , Cl 2 , Br 2 , I 2 , and At 2 The –ogens and the –ines 1 + 7 pattern on the periodic table Balancing Equations What Happened to the Other Oxygen Atom?
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  • Spring '19
  • Avena
  • Chemistry, Chemical reaction,  Products,  Reactants

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