Presentation on theme: "Lab Review for Final Exam. Experiment #1: Density Density = Mass/Volume Volume = length x width x height Units = g/mL or g/cc or g/cm 3 Density Column."— Presentation transcript:
Lab Review for Final Exam
Experiment #1: Density Density = Mass/Volume Volume = length x width x height Units = g/mL or g/cc or g/cm 3 Density Column
525 mL of water at 25 0 C (density = 0.997 g/mL) is placed in a container. The water is then cooled to form ice at -10 0 C (density = 0.917 g/mL). What is the mass and volume of the ice?
For use with acid-base titrations To deliver the solution of known concentration in a titration
Experiment #3: Physical Measurements Volume = length x width x height Displacement Method Density = mass/volume Relative Uncertainty Absolute Uncertainty
How do you determine relative uncertainty?
Relative Uncertainty is the ratio of the absolute uncertainty of a measurement to the best estimate. It expresses the relative size of the uncertainty of a measurement (its precision). For example, The measurement 25.4 + 0.1 cm
Experiment #4: Composition of a Heterogeneous Mixture Filtration Distillation Decanting Chromatography Electrolysis % Composition
How can a heterogeneous mixture be separated?
Experiment #5: Isotopes & Atomic Mass Atomic mass unit (amu) Weighted average of atomic mass from % Different molecule possibilities of isotopes
Define an atomic mass unit (amu)
1/12 the mass of 1 Carbon – 12 atom
Experiment #6: Empirical Formula of a Compound Empirical formula Molecular formula Structural formula Why add water after heating magnesium ribbon? Calculate empirical formula from mass Caffeine
What is the empirical formula of magnesium oxide?
Experiments #7 & #8: Quantitative Analysis of Hydrates Hydrate Calculate unknown value of a hydrate Calculate mass of water produced in a hydrate Calculate number of moles of water in a hydrate Methane hydrate When organic material decomposes it releases methane, also known as swamp gas. Combine water and swamp gas under low temperatures and high pressures and the result can be a frozen lattice-like substance called methane hydrate. This crystalline combination of a natural gas and water looks remarkably like ice but burns if lit with a flame.
If 16.4 grams of oxygen gas react with excess hydrogen, what mass of water is produced?
Mass = 18.5 grams
Experiment #9: Concentration of acetic acid in vinegar Titration definition & formula End point Calculate molarity Calculate concentration of unknown solution
If 25.00 mL of 0.200 M acetic acid is transferred into a volumetric flask and diluted to 5.00 x 10 2 mL, What is the concentration of the resulting solution?
Concentration = 1.00 x 10 -2 M
Experiment #10: Material value of a metal Ionic Bond Covalent Bond Metallic Bond Conductivity Electroplating Electrolysis Electronegativity Floating magnet
When the pennies were heated in the NaOH solution, a layer of zinc bonded to the copper penny. What type of bond would exist between the atoms of copper and zinc?