Balancing Chemical Equations
Matter can not be created or destroyed, just rearranged
The product of this reaction is HEAT AND LIGHT...
Combustion
A melting icecube is....
Endothermic
___________ bonds usually form between 2 nonmetals.
Covalent
List two of five factors that affect the rate of reactions.
Temperature, Stirring, Concentration/Pressure, Presence of a Catalyst, Surface Area
Where is the coefficient found in a chemical equation?
It is found before the element's symbol
The BREAK DOWN of a chemical reaction is called....(Ex. AB--> A +B)
Decomposition
Endothermic reaction
__________ bonds usually form between a metal and a nonmetal.
Ionic
An increase in stirring will _____________ the rate at which a substance cools off.
(Example: Stirring your hot chocolate or soup will do what for it?)
increase
What does the subscript tell you in a chemical equation?
How many atoms of an element you have.
A + B --> AB This reaction is called....
Synthesis
Baking a cake is an _______reaction.
Endothermic
Covalent bonds ___________their electrons, while Ionic bonds ____________ their electrons.
What is the purpose of a catalyst?
What you do to one side of the chemical equation, you must do to the other side in order to show that mass is conserved.
True
The difference between single replacement and double replacement is?
Single: AB+ C= AC + B
Double: AB+ CD= AD + BC
One extra element in double replacement
Endothermic reactions _________ energy, while exothermic reactions __________ energy.
Absorb, Release
NaCl (salt) would have what type of bond?
Ionic
Can a catalyst be reused?
Yes
What is the number we use for a single "mole?" (Avagadro's number)
6.02 x 10^23
What element must combustion use in order for a reaction to happen?
Oxygen
Boiling and Melting are examples of ______reactions.
Freezing and Condensing are examples of ________ reactions.
Endothermic, Exothermic
H20 (water) would have what type of bond?
Covalent
Chemical reactions want to reach "equilibrium." Can a forward and reverse reaction happen at the same time?
Yes!