Chem 209 - Study guides, Class notes & Summaries

Chemistry - ️️the science dealing with the composition of matter and the changes in composition that matter undergoes Macroscopic - ️️the overall view Microscopic - ️️looking deeper into things Scientific Method - ️️involves making observations, formulating hypotheses, and performing experiments Hypothesis - ️️a tentative explanation of certain facts that provides a basis for further experimentation Theory - ️️an explanation of the general principles of certain ph...

Zn -️️zinc Ge - ️️germanium As - ️️arsenic Br - ️️bromine Kr - ️️krypton Sr - ️️strontium Ag - ️️silver Cd - ️️cadmium

Draw a block diagram of a GC instrument, labeling all the important components. - ️️Mobile phase reservoir ---> Sample injector (micro syringe) ---> Stationary Phase (column) ---> Detector (thermal conductor) ----> Read-out (computer) What quantities are plotted on the x- and y-axes of a chromatogram? -️️x-axis: time y-axis: detector signal What quantities are plotted on the x- and y-axes of a calibration curve? -️️x-axis: concentration y-axis: peak area stationar...

What are Bronsted-Lowry acids and bases? -️️acids are proton donors and bases are proton acceptors. What is the difference between a strong acid and a weak acid? Give three examples of each - ️️For strong acids all substances would break down when acid is put into water. With weak acids only a few molecules would break apart when dissolved into water. Strong acids- HCL, HCLO3, H2SO4 Weak acids- H20, C2H2O4, HNO2 What is the difference between a strong base and a weak base? Give tw...

Bronsted-Lowry acid -️️electron pair acceptor & p+ donor Bronsted-Lowry base -️️electron pair donor & p+ acceptor Strong acid - ️️dissociates fully in water (higher [H+]) Weak acid -️️partially dissociates in water (lower [H+]) Strong base -️️100% ionized in solution Weak base - ️️<100% ionized in solution HCl (hydrochloric), HNO3 (nitric), H2SO4 (sulfuric) - ️️strong acids

response, time - ️️What quantities are plotted on the x- and y-axes of a chromatogram? (x first) peak area, concentration - ️️What quantities are plotted on the x- and y-axes of a calibration curve? (x first) retention time - ️️the time it takes for the molecule to travel through the column stationary phase - ️️the coating on the inside of the column partition coefficient - ️️molar concentration of analyte in the stationary phase divided by the molar concentration of t...

Organic Compounds -️️Made of carbon and hydrogen AND SOMETIMES: -Oxygen -Sulfur -Nitrogen -Halogen Organic Compounds -️️- Covalent bonds (AKA Shared electron pairs - Soluble in nonpolar solvents (AKA NOT WATER) - Low melting and boiling points - Strong, distinct odors - Flammable - Non-Polar (Equal sharing bonds)

Organic Compounds -️️Made of carbon and hydrogen AND SOMETIMES: -Oxygen -Sulfur -Nitrogen -Halogen Organic Compounds -️️- Covalent bonds (AKA Shared electron pairs - Soluble in nonpolar solvents (AKA NOT WATER) - Low melting and boiling points - Strong, distinct odors - Flammable - Non-Polar (Equal sharing bonds)

1. The efficiency of the refrigerant cycle is affected by the operation of the condenser. of the following, a more efficient centrifugal compressor operation results from Answer: Lowering the condensing pressure 2. The heat removed from the refrigerant in a condenser is Answer: Sensible and Latent Heat 3. The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdraw refrigerant for storage in suitable containers. Accord...

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