Summary: Reaction

Read the summary and the most important questions on reaction

• 1 energy

• Which molecules are combustible?

  hydrogen
  methane
  benzene
  lcohol
  glucose
  sulfur
  hydrogen sulfide
  carbon disulfide

• Which molecules are non-combustible?

  water
  carbon dioxide
  sulfur dioxide
  oxygen
  sulfuric acid
  nitrogen
  ammonia
  hydrogen chloride

• 3 conditions for reactions

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• What are the five factors that will influence the rate of a reaction?

  the type of reactant;
  the surface area of the reactant(s);
  the concentration(s) of the reactant(s);
  the temperature of the reacting mixture;
  the presence of  catalyst

• When does a chemical reaction end?

  when one of the reactants runs out.

• 4 using formulas

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• What does a molecular formula indicate?

  which atoms are present in a molecule and how many of each kind.

• Of how many kind of atoms are the molecules of elemental substances made of?

  one kind

• What is special about Phosphorous and sulfur?

  that are elemental substances with olecules that can sometimes be made up of more than two atoms.  P4 and S8

• 5 From word equation to chemical equation

• What can you use instead of a word equation?

  a chemical equation

• 6 combustion

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• What is a combustion reaction?

  is a reaction of a substance with oxygen, sometimes with visible fire.

• Which three conditions have to be met for a combustion reaction to occur?

  -there has to be a combustible substance
  -you need enough oxygen
  -the right combustion temperatureneeds to be reached