intro for rxns
The definition of a chemical change
One or more substances are transformed into new substances, involving the breaking or forming of bonds
solid = (s)
liquid = (l)
gas = (g)
aqueous = (aq)
What are the state symbols?
This diagram is a visual representation of atoms using shapes/symbols
What is a particulate diagram?
Which type of change involves changing of INTERmolecular attractions?
Physical
This ratio is found using balanced chemical reactions
What is a mole ratio?
In a closed system, matter cannot be created or destroyed
What is the Law of Conservation of Mass?
Not included in net-ionic equations
What are spectator ions?
What are the three types of representations?
Macroscopic, particulate, symbolic
What type of change involves changes to INTRAmolecular forces?
Chemical
What is stoichiometry used for?
Predict amounts of products/reactants used or needed in a specific reaction
Elements that are always diatomic
What is "Br I N Cl H O F" ?
This compound is split into ions when in water
What is the Law of Conservation of Mass?
What evidence of chemical reactions is given off when bread is baked?
Formation of gas, change in odor, etc...
What is the formula for percent yield?
(Actual yield/theoretical yield) x 100
Formation of a solid, gas bubbles, change in color, change in temperature, change in odor, production of light
What are the evidences of a chemical reaction?
Are net-ionic equations only aqueous?
No, equations include any species that is an active part of the reaction
Balanced equations represent reactions at this level
What is the symbolic level?
What is one case of a physical change that involves breaking bonds (intramolecular)?
Dissolving of ionic compounds
In order to calculate yield of product, what needs to be found first?
Limiting reactant
Synthesis, decomposition, combustion, single-replacement, double-replacement
What are the types of chemical reactions?
What ions does MgCl2 produce?
Mg 2+ and two Cl-
Balance this equation:
C2H6 + O2 => CO2 + H2O
2C2H6 + 7O2 => 4CO2 + 6H2O
What are the changes in forces of attraction that occur when H2O changes from a liquid to a vapor?
Hydrogen bonds between two H2O molecules are broken
22.4 L