# 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.

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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?

Mass = 523 grams Volume = 571 mL

Experiment #2: Safety, General Equipment & Techniques Safety equipment Safety Techniques Laboratory equipment Glassware Separation Techniques Safety Shower

What is a buret used for?

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?

Heating Filtration

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?

MgO

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?

Metallic

Experiment #11: Molecular Geometry Lewis Structures Lone pairs Molecular geometry chart (review) Hybridization

How many lone pairs are on a sulfur atom in the sulfite ion, SO3 2- ?

1 lone pair

Experiments #12 & #13: Thermochemistry & Hess’ Law Thermochemistry Coffee & Milk solution – heat of solution q = mc ΔT Enthalpy Hess’ Law combustion

Gold has a specific heat of 0.129 J/g 0 C. When a 5.00-g piece of gold absorbs 1.33J of heat, what is the change in temperature?

Temperature change = 2.06 0 C

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