dry lab

Explain the difference between constant rate filtration and constant pressure difference filtration using mathematics and examples. When might either of these procedures be used in conjunction with filtration?

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1) Determine the mass of the condensed portion of the unknown that you placed in the test tube. 2) Use the mass of the water in the test tube and it’s density to calculate the volume of the test tube. 3) Use the calculations from Questions 1 & 2, along with the temperature of the boiling water bath and the barometric pressure of the room, to calculate the molar mass of the unknown compound. 4) identify the unknown liquid substance that you tested. 5) Using the SAMPLE data, calculate the molecular weight of the unknown and determine the identity from the chart.

2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process.

Hi! This is a set of three multiple choice questions. Hope you can answer them all. Thank u~

Flow Rates 1. A pool is filled with chlorinated water at a rate of 45.6kg/min. The mass fraction of water is 0.914 and chlorine is 0.086. What is the component flow rate (mass flow rate) of chlorine?

16 Report Sheet Basic Laboratory Techniques 9. (a) Using the defined freezing and boiling points of water, make a plot of degrees Fahrenheit ... degrees Celsius on the graph paper provided. (b) Determine the Celsius equivalent of 40 °F_using your graph. The relationship between these temperature scales is linear (that is, it is of the form y = mx+b). Consult Appendix C regarding tio relationships and determine the equation that relates degrees Fahrenheit to degrees Celsius %3D (c) Compute the Celsius equivalent of 40 °F using this relationship. otoo niwallo od tuo m mes be od orb o ela

Why is it better to use 10.0mL or greater of a liquid in measuring its density?

I need help with 2 and 3 please !

Station 2: Density column In the graduated cylinder, you have molasses, water (blue), corn oil, and ethanol (red). They have the following densities: Substance Molasses Water Corn Oil Ethanol Density 1.45 g/mL 1.0 g/mL 0.92 g/mL 0.79 g/mL Polarity Polar Polar Nonpolar Polar Viscosity High Low Low Low 1. Explain why the column is arranged in the order it is according to density.

Mass of Empty Beaker is 141.2g, Beaker + Water is 388.3g,  mass of water is 247.1g, volume of water is 0.2471mL, calculate volume H2=Volume displaced water

Value Number of sig figs 301.50 0.0500 2650 7.560 x 1023

In a lab investigation, a student is asked to crush and measure 1 g of sulfur from a larger solid block. The student understands that although the mass of the sample is changing, the melting point will remain the same because he/she knows that ___.

You arrive at a crime scene and are told the body of the victim is in the 10 m deep pool. You walk over to what you are told is a 12 m in diameter, cylindrical pool. From the outside of the pool, you can see that the body looks badly burnt. Your partner says, “It looks like our victim had been burned alive and tried to put out the fire by jumping in the pool. The victim likely drowned to death.” Something does not sit right with you though. If there was a fire, where did it start? There are no signs of combustion anywhere. You aren’t so sure and ask the crime scene investigator to run a sample of the pool water before letting anybody try to pull the body out. The CSI comes back to you and tells you that normal pool water pH is roughly around 7.2, but the pool pH is actually highly basic at a level of 13 with a concentration of hydroxide ions at 1.0 x 10-1 mol/L. It becomes obvious to you that the body wasn’t burned before going in to the pool , but AFTER and there was no fire needed!…

Explain the difference between random sampling and haphazard sampling as used in Analytical chemistry.

When using the Dumas Method....   The student filled their 400 mL beaker with 250 mL of tap water and added 2 boiling stones.  They then sat their beaker on the hot plate and clamped it in place using a metal ring attached to a ring stand. The student began heating the beaker. The student obtained a 250 mL Erlenmeyer flask from the drying rack.  It looked clean but had a few water droplets inside.   The student cut out a 3 inch by 3 inch piece of aluminum foil and found a rubber band. The student determine the mass of the Erlenmeyer flask + piece of foil + rubberband.  The mass was 68.780 g. The student used a 10 mL graduated cylinder to measure out 4.5 mL of unknown liquid.  They added their unknown liquid to the 250 mL Erlenmeyer flask.   The student covered the Erlenmeyer with aluminum foil and rubber band.   Using a paper clip, the student poked 3 holes in the top of their aluminum foil The student then clamped their flask in the water bath, that hadn't started boiling yet.   When…

Is 10 ppm 400% less than 50 ppm?

Read the scenario below. Identify what is inappropriate lab behavior in each instance. Then write the appropriate lab safety technique. Kendra is heating a test tube for an experiment using a Bunsen burner. She didn't put on safety goggles since she already wears glasses. She tilts the test tube mouth away from her towards her lab partner, since the steam keeps fogging up her glasses.