Chem 101l - Study guides, Class notes & Summaries

CHEM 101L EXAM FINAL QUESTIONS AND ANSWERS When should you wear gloves in the laboratory setting? They must be worn at all times when handling glassware and chemicals When should you not wear gloves in the lab setting? gloves must be removed before leaving the lab gloves should be removed when touching computer, or other personal items. gloves should be removed when leaving lab What should you do with loose/long hair/clothing? tie back securely constrained under a lab coat W...

Which gas law states: temperature and pressure are directly proportional? Select one: a. Boyle’s b. Charles’s c. Avogadro’s d. Gay-Lussac’s In general, for a gas at a constant volume: Select one: a. The pressure of the gas is directly proportional to its temperature in Kelvin. b. The volume of the gas is directly proportional to its temperature in Celsius. c. The pressure of the gas is inversely proportional to its temperature in Kelvin. d. The volume of the gas is inversely p...

All of the following are rules which must be followed during an experiment except: Select one: a. The experiment must be replicable over several trials b. There must always be quantifiable data c. Only one variable can be tested at a time d. There must always be a control True or false: A testable question asks how the independent variable has an effect on the dependent variable. Select one: a. True b. False Suppose you conduct one experiment and find that the E = mc , rather than the...

CHEM 101L UNC FINAL QUESTIONS AND ANSWERS If a flammable substance in a beaker should catch fire while you are working but the flames are relatively contained, what should you do to extinguish the flame? What should you not do? DO: Use the chemical fire extinguisher from the lab. Pull the pin, aim the nozzle to the beaker, and pull the lever. DO (Best, simplest): Turn off the heat source immediately and use a watch glass to cover the beaker. DON'T: Use water from the nearest sink to d...

Wavelength of light emitted depends directly on: Select one: a. The quantity of energy absorbed by an electron. b. The specific element the electron belongs to. c. The quantity of energy released by an electron. d. All of the above What is the total number of electrons that can occupy the third principle energy level? Select one: a. 8 b. 2 c. 10 d. 18 The electron configuration 1s 2s 2p 3s 3p 4s 3d 4p represents which element? Select one: a. Germanium b. Arsenic c. Silicon d. P...

A physical property that depends on only the type of material and not on how much of that material that you have is known as Select one: a. Inheritable property b. Intensive property c. Extensive property d. Exhausted property True or false: If you are changing a larger unit into a smaller unit, like cm into mm, the decimal is moved to the right because you are multiplying by a power of ten Select one: a. True b. False The metric system is based upon Select one: a. Multiples of 1 ...

CHEM 101L QUESTIONS AND ANSWERS A. 0.01998 mol If the balanced equation for the reaction of calcium carbonate with hydrochloric acid is: 2 HCl (aq) + CaCO3 (s) —► CaCl2 (aq) + CO2 (g) + H2O (l) How many moles of HCl can be neutralized by an antacid containing 1000 mg (1.000x103 mg) of calcium carbonate? (CaCO3 MW = 100.1 g/mol) A. 0.01998 mol B. 9.99 x 10E-3 mol C. 0.009990 mol D. 200.2 mol E. 2.00 x 10E-2 mol F. 100.1 mol B. The powdered tablet is immersed in the soluti...

True or false: A solution is a homogeneous mixture in which the components are uniformly mixed. Select one: a. True b. False True or false: When water is the solvent, the solution is called an aqueous solution. Select one: a. True b. False When two ionic solutions (salts) are combined, the resulting mixture contains positive and negative ions from each solution. The mixing permits new combinations of ions. If one or more of these new ion combinations happen to be insoluble in water, ...

Select one: a. Linear b. Trigonal Planar c. Bent d. Trigonal Pyramidal The three-dimensional manner in which the atoms of a molecule project into space is important because it affects which of the following Select one: a. Physical properties b. Solubility c. Melting point d. All of the above What is the predicted bond angle for a molecule with a trigonal bipyramidal geometry? Select one: a. 90 b. 120 c. 180 d. Only A and B are correct Which elements have a complete outer electr...

CHEM 101L FINAL QUESTIONS AND ANSWERS exit the lab and proceed to the stairs nearest the Venable parking lot and Columbia Street. After exiting on the ground floor you should meet your TA on the far side of the driveway to the parking lot so that you can be included in a head count of those safely evacuated, keeping the drive clear for emergency vehicles/exit the lab and proceed to the stairs nearest the elevator. After exiting on the ground floor you should meet your TA in front of the sig...