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 chemical reaction. (think temperature)
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 is considered _________.
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?
Balance the following chemical reaction:
H2 + NaCl --> HCl + Na
H2 + 2NaCl --> 2HCl + 2Na
DOUBLE JEOPARDY!!!!!!!!!
An expression in which symbols and formulas are used to represent a chemical reaction.
A chemical equation
This term means “different”, does not look the same throughout, can be layered
What is a Heterogeneous Mixture?
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 three examples of details showing 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?
These types of reactions involve rearranging the chemical composition. Often times the same or fewer products than reactants.
What is a Combining Reaction?
Balance the reaction: Na + H2O --> NaOH + H2
What is 2Na + 2H2O --> 2NaOH + H2
This type of reaction involves breaking down the chemical composition. Often times more products than reactants result.
What is a Decomposing reaction?