Study

Chemcial Reactions

  •   0%
  •  0     0     0

  • What side of the arrow would energy or heat be on if the reaction is exothermic?
    right (product)
  • 2 atoms of calcium can react to create 6 atoms of calcium.
    false
  • This is the type of reaction that during a reaction thermal energy is absorbed.
    endoterhmic reaction
  • Brennan watched as 2 compounds reacted and changed into 2 different compounds. What type of reaction is this?
    double replacement
  • This is the minimum amount of energy needed for a chemical reaction to occur.
    activation energy
  • What would the coefficient be in this reaction? Cu2O + C --> Cu + C02
    2Cu2O and 4Cu
  • What is NaCl?
    salt
  • This is something that speeds up a chemical reaction but does not change itself.
    catalyst
  • In the reaction: C3H8 + 5O2 --> 4H2O + 3CO2, how many oxygen atom are on the product side?
    10
  • Nate observed an experiment where 1 substance produced 2 substances. What type of a reaction is this?
    decomposition
  • what type of reaction becomes colder?
    endothermic
  • A change in shape of an object is an example of ____.
    physical change
  • In the reaction methane + oxygen yields carbon dioxide + water, what are the reactants?
    methane + oxygen
  • During a combustion reaction, what element must be part of the reactant?
    oxygen (O2)
  • Where would the coefficient belong in this reaction? NaCl --> Na + Cl2
    before NaCl and Na
  • All chemical reactions occur at the same rate.
    false
  • Which of the following is NOT evidence of a chemical change? color, temperature, odor, state of matter
    state of matter
  • If the arrangement of atoms in a substance changes, chemical properties are the same but physical properties change.
    false
  • This is certain proof that a chemical reaction has occurred.
    change of chemical properties
  • Atoms are not ____ during a chemical reaction according to the law of conservation of mass.
    created or destroyed
  • An experiment has 1 element and 1 compound and ends up with a different element and a different compound. What type of reaction is this?
    single replacement
  • Energy is needed to break the bonds in a chemical reaction.
    true
  • This slows down a chemical reaction.
    inhibitor
  • In a chemical reaction, what are the substances on the right side of the arrow called?
    product
  • Chemical reactions are balanced by changing the subscripts of the molecules.
    false
  • Which will burn fastest in open air, a log 2 feet in diameter, or a pile of splinters made from a 2 foot diameter log?
    pile of splinters made from a 2 foot diameter log