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Tools of Chemistry and Identification of Matter
Tools of Chemistry and Identification of Matter
This page contains both the Virtual Experiment 2 and the hands on Experiment 2. We will be completing the Virtual experiment this semester.
The assignments that must be completed and submitted in Canvas are the following:
The assignments that must be completed and submitted in Canvas are the following:
Buret Quiz in Canvas. Read the buret tutorial at https://docs.google.com/document/d/1RgFQPJyeiAM-bCiXRn21_U2X2XpeKyyqWDHVzVts2As before attempting the buret quiz.
Laboratory Report of the experiment using the resources listed below and the data given in the procedure of the laboratory assignment
Post laboratory problems and Conclusion paragraph using the RERUNS method
Exp2andAct4explanation.mp4This is a discussion of Experiment 2 and Graphing in Activity 4
Discussion:
Discussion:
Density is the relationship between the mass of an object and its volume.
Density = mass of the substance / volume of the substance.
Density is a physical property of any substance and often used to identify the materials. The mass of the substance is always measure in grams and the volume of most liquids and solids are measured in either mL or cm3. Therefore the units of density can be written as either g/mL or g/cm3. The density is considered to be the mass of 1 mL or 1 cm3.
A detailed discussion is available on the Experiment 2 website.
Pre Writing assignment
Pre Writing assignment
The student should complete two assignments before coming to the laboratory discussion. The first is a pre laboratory writing assignment that will be required for most of the laboratory assignments. The pre writing assignment may consist of up to three parts: a purpose statement of what the objectives of the assignment are, a theory paragraph containing background and an understanding of why we are completing this assignment and finally, a summary paragraph of the procedure explaining how the assignment will be completed.
The student should complete a pre laboratory writing assignment for Experiment 2 that contains a summary paragraph of the procedure explaining how the assignment will be completed and a list of the data that must be collected while performing this experiment. A pre writing assignment is included in the example of a formal laboratory report at https://docs.google.com/document/d/1BGBPJS3VqNME4cKDrR50HqqrIYZt0sZ9UCg6IrS3MDk This assignment will only be accepted before the laboratory session begins. No late assignments will be accepted.
Pre laboratory Problems
Pre laboratory Problems
The pre laboratory problems are questions about the laboratory assignment, background, definitions or procedure and calculations. These problems should be completed BEFORE coming to the class where the assignment will be discussed.
Read the Buret Tutorial and complete the Buret quiz in Canvas in Experiment 2 assignments
Procedure
Procedure
Complete the individual parts of this laboratory using the resources given below and in the laboratory assignment.
Use the following videos and the pictures or images in the laboratory assignment to complete the assignment.
Use the following videos and the pictures or images in the laboratory assignment to complete the assignment.
Part A: Accuracy and Precision
Part A: Accuracy and Precision
The laboratory report of the assignment contains questions, data collection, calculation and reporting of results. Use the images of measurement in the full document or in the laboratory report to record the measurements and perform the calculations.
In this experiment, the density of liquids will be determined by measuring the mass and the volume of the liquids. The volume of a liquid can easily be determined by using a tool that measures volume. Graduated cylinders and volumetric pipets are often used but a buret can also be used to determine the volume of a liquid both accurately and precisely. There are several methods that can be used to determine the volume of a liquid. This experiment will compare all three methods, using a graduated cylinder, a volumetric pipet and a buret. Pipets and burets are often used to measure the volume of a liquid that is being transferred while a graduated cylinder is used to determine the volume of a liquid that is not poured out of the container.
Using a buret, a 10 mL graduated cylinder and a 10 mL volumetric pipet will be used to measure the volume of water. so that the density of the water can be determined.
Using Burets and Pipets: the following are several YouTube videos that might be useful.
Accuracy and Precision for Data Collection
Accuracy and Precision for Data Collection
Professor Dave Explains - In science, we love data! But what are the rules of data collection? How accurate and how precise can we get with our data? What do these words even mean? Let's find out!
Reading a Buret: http://youtu.be/RHTxIYDJ730
how to read a graduated cylinder: https://youtu.be/7ewRaV5baik
Proper use of a pipet:
In this experiment, we will determine the accuracy and precision of these two tools in measuring the volume of water.
Sites that have the density of water at various temperatures
Appendix M: Physical Properties of Water: https://drive.google.com/open?id=1-ETcY_LkzMKgHACM1Ix6BxeC_aH4UQKQ37BZn-Vt3Ek
http://antoine.frostburg.edu/chem/senese/javascript/water-density.html
This is the book value of the density of water and this value is used to determine the percent error using the relationship shown above.
Part B: Density of a Salt Solution
Part B: Density of a Salt Solution
The laboratory report of the assignment contains questions, data collection, calculation and reporting of results. Use the images of measurement in the full document or in the laboratory report to record the measurements and perform the calculations for this part of the experiment.
In this part of this experiment, we will determine the density of a salt solution using a 10.00 mL pipet to measure the volume of the unknown salt solution. Use the images to determine the mass of the unknown salt solution A, B or C. Calculate the density of the unknown salt solution.
Once the density is determined, we can use the given density versus % mass data to create a calibration curve, which is then used to extrapolate the calculated density to the % mass in the calibration graph.
Part C: Density of a metal cylinder
Part C: Density of a metal cylinder
The laboratory report of the assignment contains questions, data collection, calculation and reporting of results. Use the images of measurement in the full document or in the laboratory report to record the measurements and perform the calculations for this part of the experiment.
In this part of the experiment, the density of solids will be determined . The volume is determined either by a method of water displacement or by calculation of the volume of a regularly shaped object such as a sphere or cube.
We will use the calipers and micrometers to measure the length and diameter of a metal cylinder. See Experiment 0 for directions on how to use these tools.
Using the displacement method to determine volume and a linear measurement technique
How to use a Venier Caliper: http://youtu.be/4hlNi0jdoeQ http://youtu.be/ZUNoWWw6V10 https://youtu.be/9DAxslknc-M
How to use a Micrometer: http://youtu.be/i_jygJkJujE in metric: http://youtu.be/O8vMFFYNIfo
How to read a metric ruler: https://youtu.be/GbOu0d18mSg
How to read a micrometer: https://youtu.be/O8vMFFYNIfo
Density of metals:
Post Laboratory Problems and Conclusion paragraph
Post Laboratory Problems and Conclusion paragraph
The post laboratory problems contains questions that determine your understanding of the laboratory assignment.
While the conclusion paragraph is a summary of what you learned in the assignment. The conclusion paragraph should not just be "this is what I learned" statement but a summary of the assignment, analysis of the data and results of the assignment and critical thinking about what was learned and why it is important. The RERUN
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