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?
The numbers in front of compounds used to balance a chemical equation.
What are coefficients?
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 substance added to a chemical reaction but not part of the reaction that lowers the activation energy ( makes the reaction happen faster) is called ____.
What is a catalyst?
The minimum amount of energy needed to start a chemical reaction.
What is Activation Energy?
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 type of reaction involves two or more subtrances combining to form a more complex substance.
What is a Synthesis reaction?
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?
The molecule C12H22O11 is a chemical formula commonly know as this.
What is sugar (sucrose)?
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?
The "Elephant Toothpaste" demonstration is endothermic. True or False.
What is False?
The kind of reaction which happens when two atoms in different compounds trade places.
What is double displacement or double replacement?
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?