Chemical Reactions
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
A substance that enters a chemical reaction is called this.
What is a reactant?
A reaction that releases energy is called this.
What is exothermic?
This type of change occurs with a change in the properties of a substance that is usually reversible.
What is physical?
DOUBLE JEOPARDY!!!!!!!!!!
C3H8 + O2 ----> 3CO2 + 4H2O + heat
is this type of temperature chemical reaction.
exothermic
This type of change occurs when a substance or multiple substances rearrange, in which a new substance is created.
What is a chemical change?
DOUBLE JEOPARDY!!!!!!!!!!!!!
A chemical reaction in which energy is absorbed.
endothermic
A molecule consisting of two atoms. Ex: O2 or H2
What is diatomic?
Means “the same”, Looks the same throughout, Usually a solution because particles are dissolved evenly
What is a Homogeneous Mixture?
Is this a balanced chemical equation?:
H2 + NaCl --> HCl + Na
What is no? There is 2 hydrogens on the reactant side and only 1 on the product side.
DOUBLE JEOPARDY!!!!!!!!!
An expression in which symbols and formulas are used to represent a chemical reaction.
A chemical equation
What is synthesis mean in Latin?
What is, to put together?
State the Law of Conservation of Mass.
What is that matter can not be created or destroyed in a chemical reaction?
When balancing an equation, these numbers can not be changed.
What is a subscript?
DOUBLE JEOPARDY!!!!!!!!!!!!!
A solid that forms from a solution during a chemical reaction.
a precipitate
An increase in temperature will usually cause the rate of reaction to ________________.
What is increase?
The reaction 2HgO ---> 2Hg + O is an example of this type of reaction.
What is decomposition?
This Contains 2 or more different atoms chemically combined, also categorized as a molecule
What is a Compound?
Give five examples that a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
All particles are the same, Properties are constant
What is a Pure Substance?
Rearranging the chemical composition. Often times the same or fewer products than reactants.
What is a Combining Reaction?
Is this a balanced equation?: Na + H2O --> NaOH + H2
What is yes? There is 1 Sodium, 2 Hydrogen, and 1 Oxygen.
Breaking down the chemical composition. Often times more products than reactants.
What is a Decomposing reaction?