Definitions
Lab Technique
Lab Equipment
Simple Calculations & short answer
more Calculations
100
This phase change involves a solid changing into a gas
What is sublimation
100
This lab technique involved giving the most accurate measurement of mass. describe.
What is weighing by difference
100
This piece of equipment is used to measure MASS most accurately in lab
What is an electronic or triple beam balance
100
What is the approximate volume of 27.5 g of water at 25 degrees Celsius
What is 27.5 mL if d=1g/mL
100
Sodium hydroxide solution and KHP (M.W. = 204.2 g/mol) react in a 1:1 molar ration, if .454g of KHP requires 23.2 mL of a sodium hydroxide solution to reach an end point, calculate the molarity of the NaOH solution.
What is .095M NaOH
200
This reactant is in lesser amount and determines the amount of product that can be produced by a reaction
What is the limiting reagent
200
this technique is used to find the volume used during a titration, describe.
What is measuring volume by difference
200
This piece of lab equipment is used to measure volume most accurately and why!?
What is the volumetric pipet, because it has a smaller diameter
200
When a rubber stopper of mass 4.0 grams was immersed in a graduated cylinder containing 18 mL of water, the water level rose to 20 mL. What is the density of the rubber stopper?
4.0g/ (20-18) = 2g/mL
200
Calculate the molal freezing point depression constant for benzene C6H6, if its normal freezing point temperature is 5.45 degrees Celsius but a solution prepared by dissolving 1.37 grams of acetamide (C4H5NO) in grams of benzene freezes at .75 degrees Celsius.
What is .92
300
Oil and vinegar is an example of this kind of mixture
What is a heterogeneous mixture
300
When reading the volume of a liquid you should always read from the bottom of this
What is the meniscus
300
What piece of lab equipment is used to measure temperature most accurately?
What is a thermometer
300
Describe how you would separate sodium chloride from sand and ammonium chloride
First dilute the mixture with distilled water, then use a buchner funnel to suction/filter the sand from the NaCl and NH4Cl. Next recover the liquid from the funnel and heat until the ammonium chloride sublimes and the NaCl solidifies.
300
Calculate the percentage by mass of acetic acid (C2H402), in vinegar if it takes 21.5 mL of .210 M KOH to neutralize 7.04 g of vinegar
What is 3.8% acetic acid
400
This definition refers to the maximum amount of solute that may be dissolved in a solvent.
What is Solubility
400
This laboratory technique is used to find the concentration of a solution
What is a titration
400
This piece of equipment is used to dispense liquids and measure volumes
What is a buret and or a graduated cylinder.
400
What is the percent magnesium in magnesium oxide (MgO)
What is 24g/40g x 100% = 60%
400
Determine the volume of the flask (and therefore the volume of gas), IN LITERS if the mass of the empty flask = 155.26 g and the mass of the flask filled with water is = 398.52 grams, and the density of water at 24.8 degrees celsius is .0997g/mL
What is ~ .244L
500
These properties depend on the number of particles in solution rather than the properties of the particles.
What is a colligative property
500
DAILY DOUBLE! How can you change the: 1)volume of a gas: 2)concentration of a solution: 3)yield of a reaction: 4)color of an indicator: 5)pH of a solution:
1) change the container 2) add more solute or solvent 3) increase the amount of limiting reactant 4) adding more acid or base 5) adding more acid or base
500
This piece of lab equipment is used to measure the end-point of a titration
What is a pH indicator
500
Draw the Lewis structure, predict the electron pair arrangement and the molecular geometry for the following molecules: 100 point bonus: Does the electron pair arrangement or the molecular geometry determine bond angle?
CS2: e- pair- linear, molec geo- linear, ICl4: e- piar-trigona bipyramid, molec geo- see-saw
500
If the volume of gas is .244L, temperature of boiling water is 99.6 degrees celsius, the pressure is 761.6 torr, and mass of volatile liquid used is .811grams. Calculate the molar mass of the volatile liquid. (R= .00821)
What is ~101.4
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