semester 2 chem test Flashcard

Subscript
the small numbers to the lower right of chemical symbols
Coefficent
The large number in front of chemical formulas in equations
Coefficent
Equations are balenced by changing…
the number of atoms
What do subscripts represent
the number of molecules
What do coeffients represent
Reactants
the starting substance in a chemical
Chemical Change
process by which one or more substances are changed into one or more different substances
products
substances that are formed by the chemical reaction
Compound+compound=Compound+compound
The general form for double displacement
decomposition
a reaction involving the break up of a substance into simpler substances
element+compound=element+compound
the general form for single displacement
precipitate
An insoluable compound that forms from the reaction of compounds in a solution
Synthesis equation
A+B=AB
Single replacement equation
A+BX=AX+B
double replacement equation
AX+BY=AY+BX
decomposition equation
AB=A+B
change in color, change in odor, formation of a precipitate, forming gas bubbles, and change in temp
5 indications of a chemical change
Ideal gas constant (R)
8.31
Boyles’s law
For a given mass of gas at a constant temp, the volume of a gas varies inversely with pressure
Gay-Lussac’s Law
The presssure of a gas is directly proportional to the kelvin temp, if the volume remains constant
Ideal gas law
PV=nRT
Charles law
The volume of a fixed mass of gas is directly proportional to the kelvin temp if the pressure is kept constant
273 K
0 degrees C or standard temp
101.3 KPA
Standard pressure
Miscible
When a liquid can dissolve in another liquid
Electrolytes
When the solute can conduct electricity
exp: Salt
solubility
the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a liquid solvent to form a homogeneous solution. The solubility of a substance strongly depends on the used solvent as well as on temperature and pressure
Solvent
a liquid substance capable of dissolving other substances
Solute
the dissolved matter in a solution
water
the most common solvent
Gaseous solute and liquid solvent
A carbonated drink
concetration
The terms dilute and concentrated refer to the _____ of a solution
Solution
a mixture from which the solute cannot be filtered
sufacent
wetting agents that lower the surface tension of a liquid
exp: Soap and detergent

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