Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
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?
Name three factors that affect the rate of a chemical reaction.
surface area, temperature, catalysts, stirring, concentration
What happens to energy in an exothermic reaction.
energy is released
energy + water -> hydrogen + oxygen
... is an example of this type of reaction.
What is an example of a decomposition reaction?
DOUBLE JEOPARDY!!!!!!!!!!
A + B -> AB
What is a synthesis reaction?
This type of reaction occurs when an element displaces another element in a compound, producing a new compound and a new element.
What is a single replacement reaction?
DOUBLE JEOPARDY!!!!!!!!!!!!!
Breaking down the chemical composition. Often times more products than reactants.
What is a decomposition reaction?
The energy needed to start a chemical reaction is called _________energy.
activation
What are 2 ways in which chemical equations can be represented?
1. Word equations
2. Balanced chemical equations
Balance the following chemical reaction:
H2 + NaCl --> HCl + NaH
H2 + NaCl --> HCl + NaH
DOUBLE JEOPARDY!!!!!!!!!
An expression in which symbols and formulas are used to represent a chemical reaction.
A chemical equation
Means “different”, Does not look the same throughout, Can be layered
What is a Heterogeneous Mixture?
State the Law of Conservation of Energy.
Energy cannot be created or destroyed, only transferred.
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?
Which model says that in order for a reaction to occur, particles most collide with each other with the proper alignment, and with enough force.
collision model
Give three examples that a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
ammonia + hydrogen chloride -> ammonium chloride
... is an example of this type of reaction.
What is a synthesis reaction?
Give three evidences that a chemical reaction has occurred?
bubbles, precipitate, energy released or absorbed, color change
Balance the reaction: Na + H2O --> NaOH + H2
What is 2Na + 2H2O --> 2NaOH + H2
What are substances that speed up the rate of a reaction without being consumed (used up) called?
catalysts