Show:
Chemical Reactions
Chemical Reactions II
Chemical Reactions III
Chemical Reactions IV
Potpourri
100
One of the following is NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.
What is burning wood?
100
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
100
A substance that enters a chemical reaction is called this.
What is a reactant?
100
A reaction that releases energy is called this.
What is exothermic?
100

A mixture where the particles can be easily seen and separated with a filter.

suspension mixture

200
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
200

DOUBLE JEOPARDY!!!!!!!!!!

C3H8 + O2 arrow 3CO2 + 4H2O + thermal energy is this type of reaction.

exothermic

200
When two or more simple substances combine to form a new, more complex substance it is this type of reaction.
What is synthesis?
200

DOUBLE JEOPARDY!!!!!!!!!!!!!

A chemical reaction in which energy is absorbed.

endothermic

200

The type of chemical reaction that occurs when soda goes flat. 

What is decomposition?

300
The number that describes how many molecules of a substance are involved in a chemical reaction.
What is a coefficient?
300
A substance that increases the reaction rate without changing itself is this.
What is a catalyst?
300

DOUBLE JEOPARDY!!!!!!!!!

An expression in which symbols and formulas are used to represent a chemical reaction.

A chemical equation

300
During a chemical reaction chemical bonds can be formed when electrons are shared, gained or lost.....
What is all three?
300
State the Law of Conservation of Mass.
What is that matter can not be created or destroyed in a chemical reaction?
400
When balancing an equation, this can not be changed.
What is a subscript?
400

DOUBLE JEOPARDY!!!!!!!!!!!!!

A solid that forms from a solution during a chemical reaction.

a precipitate

400
An increase in temperature will usually cause the rate of reaction to ________________.
What is increase?
400
The reaction 2HgO arrow 2Hg + O is an example of this type of reaction.
What is decomposition?
400
Define activation energy.
What is the energy required to start a chemical reaction?
500
Give three examples that a chemical change has taken place.
What is temp. change, color change, formation of an alloy, formation of a precipitate, formation of a gas?
500

DOUBLE JEOPARDY!!!!!!!

What are 2 ways to speed up a reaction?

Increase temperature, add a catalyst, stir/move

500

Created or manufactured by humans

synthetic

500
Balance the reaction: Na + H2O -> NaOH + H2
What is 2Na + 2H2O -> 2NaOH + H2
500

the substance that is dissolved by the solvent

solute