University:
Eastern Kentucky University
Course:
CHE 111 | General Chemistry
Academic year:

2022
Views:

336

Pages:

1
Author:

Carissa Thomas

Unit 4: Chemical Reactions Physical Change: ● Occurs when a substance undergoes a change in properties but not a change in composition, ie. changes in the phase of a substance, formation/separation of mixtures of substances Chemical Change: ● Occurs when a substance is transformed into new substances with different compositions, ie. introduction of heat/light, formation of gas, precipitate is formed when mixing 2 aqueous substances, and color change ● Dissolution can be considered physical and/or chemical Percent Yield: actual yield/theoretical yield x 100% Titration: ● Titrant - Solution of known concentration ● Analyte - Solution of unknown concentration ● Equivalence point - Point at which the amount of titrant added to analyte results in perfect ● neutralization ● Indicator - a substance added at the beginning of the titration that changes color at the ● equivalence point ● Endpoint - the point at which the indicator changes color Oxidation-Reduction (redox) reactions: ● 1 or more electrons are transferred in a reaction ● Oxidation: increased oxidation states (lost electrons, charge increased) ● Reduction: decreased oxidation states (gained electrons, charge decreased) ● In general, metals tend to get oxidized because they “want” to lose electrons to get octets ● Nonmetals tend to get reduced as they “want” to gain electrons to get octets Oxidizing Agent: is reduced Reducing Agent: is oxidized OIL RIG: oxidation is loss of electrons, reduction is gain of electrons