Study guides, Class notes & Summaries

Title: Quantitative and Qualitative Analysis Purpose: The purpose of this experiment is to learn how to measure the amount of a substance that is present in a chemical compound. A metal carbonate will be analyzed to determine how much CO2 and moles of CO2 are lost. Another experiment will also look into how much water a hydrate loses and determine what type of hydrate it is. Paper chromatography will be used to determine the identity of chemical substances. Lastly, SEM/EDX will be used to d...

Experiment #: 2 Title: Density Determination Purpose: The purpose of this experiment is to learn how to calculate the density of both liquids and solids in the chemistry lab by finding the volume and mass of different substances. Procedure: Density Determination of Water: 1) A graduated cylinder is to be filled with water 2) The temperature is taken using a digital thermometer of the water in the graduated cylinder 3) A value is read and recorded in ºC for the temperature of the water ...

Experiment #: 6 Title: Equilibrium Reactions Purpose: To study equilibrium reactions with two experiments 1. Determine the equilibrium constant Kc and 2. Study LeChatelier’s Principle Procedure: 1. Add 10mL acetic acid and 10mL propyl alcohol in a small flask using a pipette. Mix well 2. Take 1mL pipette sample from flask and place in beaker. Add in about 25mL of water and a few drops of phenolphthalein indicator. 3. Titrate with sodium hydroxide in buret until color change. Record mL ...

Title: Bonding and Properties Purpose: Study the infrared spectra and physical properties of molecules to determine what kinds of intra-molecular bonds are present within the molecules and what kinds of intermolecular bonds are present between the molecules. Procedure: 1. Add potassium chloride (ionic) to water in a test tube. Shake tube so potassium chloride dissolves. 2. Add pentate to test tube of water. Shake to see if it dissolves in the water. 3. Add normal propyl chloride to test t...

Title: Chemical Reactions Purpose: Observe different kinds of chemical reactions and the results. Six tyles of simple chemical reactions and reversible reactions Procedure: 1. Combine AgNO3 (silver nitrate) and HCl (hydrochloric acid) in test tube. White solid forms - AgCl (silver chloride) 2. Put stopper on and invert to mix. Double displacement reaction. 3. Combine KI and Pb(NO3)2 - creates a yellow liquid (used to be used in paints - caused lead poisoning) 4. Acid/Base Double displac...

Title: Equipment, Safety, and Mass/Volume Measurement Purpose: To go over the safety aspects of working in the chemistry lab. Go over the equipment that will be used in the chemistry lab. To observe mass and volume measurements. Procedure: 1. Review commonly used laboratory equipment. 2. Review commonly available safety equipment. 3. Measure mass of cellphone using analytical scale #1 4. Measure mass of graduated cylinder using analytical scale #1 5. Measure mass of metal cylinder using ...

Experiment #: 2 Title: Density Purpose: To measure the density of some liquids and solids which includes some materials of biological interest. Procedure: 1. Dispense 10mL of water using a 10mL pipet into beaker on zeroed scale 2. Use scale to measure mass of water 3. Calculate density 4. Add 5mL of water to beaker using a 5mL pipet 5. Use scale to measure mass of water 6. Calculate Density 7. Add 10mL of water to beaker using a 10mL pipet 8. Use scale to measure mass of water 9. Ca...

Show the calculation of the molecular weight for the following two compounds, reporting your answer to 2 places after the decimal. 1. Ca3(PO4)2 2. C9H8NO4Cl Your Answer: 1. 3(40.08)+2(30.97+4(16))=310.18 g/mol Ca3(PO4)2 2. 9(12.01)+8(1.008)+14.01+4(16)+35.45 = 229.61 g/mol C9H8NO4Cl 1. 3Ca + 2P + 8O = 310.18 2. 9C + 8H + N + 4O + Cl = 229.61 Question 2 9 / 10 pts You may find the following resources helpful: Scientific Calculator Links to an external site. Periodic Table Equation ...

Complete the two problems below: 1. Convert 845.3 to exponential form and explain your answer. 2. Convert 3.21 x 10-5 to ordinary form and explain your answer. Your Answer: 8.453x10^2 - the decimal point was moved two places to the left - the first number was 8 .0000321 - the decimal point needed to be moved five spaces to the left. 1. Convert 845.3 = larger than 1 = positive exponent, move decimal 2 places = 8.453 x 102 2. Convert 3.21 x 10-5 = negative exponent = smaller than 1, move ...

Title: Quantitative and Qualitative Analysis Purpose: To measure how much of a substance is in a chemical compound. Procedure: Carbonate 1. Place one test tube in beaker and tare scale. 2. Use scoopula to add 1g of the carbonate. Record exact weight and place carbonate into beaker. 3. Add sulfuric acid to test tube (~⅓ full ) and place inside beaker 4. Measure weight of test tube with sulfuric acid and beaker with carbonate and record. Tare scale again. 5. Pour sulfuric acid into bea...

CHEM 121 Final Exam (2023/2024) questions and answers

CHEM 121 LATEST UPDATED EXAM VERSION 2024 WITH COMPLETE QUESTIONS AND 100% VERIFIED CORRECT ANSWERS ALREADY A+ GRADED (NEW BRAND MODULE)