Question

In: Chemistry

Procedure, Part 1: Remember when using the experimental insert to place it under a clear plastic...

Procedure, Part 1:

Remember when using the experimental insert to place it under a clear plastic reaction surface; a sheet of plastic wrap works well. Place your samples such that they straddle the “X,” with some of the material in the drop over white paper, and some over the black “X.” This will allow you to see both pale solution colors, and small amounts of lightly colored solids.

1.Obtain a page of newspaper and tear it in half from top to bottom. Examine the torn edges with the hand lens and record your observations. Now take one half and tear it in half so the second tear is perpendicular (at a right angle) to the first tear. Examine the torn edges with a hand lens and record your observations. Note any differences in the two tears.

2.Observe a large piece of rock salt with a hand lens. Note things such as its color, its approximate size and shape, and the texture of the surface. Then use a rounded rock or other hard item to gently break the large piece into a few smaller pieces (try not to completely pulverize it). Note and record what you observe. Return any large dry pieces of rock salt to the vial. Now add several drops of water to a few very small flakes of salt. Record your observations after several minutes.

3.Place a very small sample of sand over the large “X” on your reaction surface insert. Observe the sand with a hand lens. Note things such as the color, approximate size and shape of granules, and the texture of the individual grains of sand. Are they all the same, or different? If there are differences, note the different types of sand grains that you observe within the sample. Note and record what you observe. Return most of the sand to the vial. Now add several drops of water to a few grains of sand. Record your observations after several minutes.

4.Place one drop of water and one drop of mineral oil separately on your small-scale reaction surface such that they do not tough. Observe and note any differences in the behavior of the water and oil. Again look at things like size, shape, mobility, color, and luster. Examine the drops with a hand lens. Record your results.

5.Place ½ teaspoon of baking soda over the large “X” on your reaction sheet. Observe the baking soda with the hand lens and record your observations. Add one teaspoon of vinegar to the baking soda and observe the reaction. Record your observations.

Procedure

Observation

1.torn paper

                                            

                                      

Vertical tear:

Horizontal Tear:

2. Appearance of rock salt crystals

                                     

Before crushing:

After crushing:

Wet

3   Appearance of sand

                                     

                              

Dry:

Wet:

4.   oil and water on plastic

                                     

Oil:

Water:

5.   baking soda and vinegar

Baking soda, dry:

After combined:

Solutions

Expert Solution

Procedure

Observation

1.torn paper

                                            

                                      

Vertical tear:

  • Hair let like appearance which differs from the bulk paper.
  • White coloured
  • Opaque
  • Not lustrous

Horizontal Tear:

  • Similar appearance like above.There are no observable differences between the two.
  • The hair lets are the strands of the polymer, cellulose out of which the paper is made.

2. Appearance of rock salt crystals

                                     

Before crushing:

  • White, shiny(Lustrous), crystalline solid particles with sharp edges.They are hard solid in touch.
  • Almost opaque
  • The size of the individual particles differ, but the color and appearance is same.

After crushing:

  • The size of the particle reduced, but the color and physical properties remain the same.

Wet

  • After some time, the lumps of salt found to be separated
  • Individual particles are found to be smaller in size (some part got dissolved in water).
  • The shape of remaining particle is deformed
  • Lustrous nature reduced or almost lost
  • The color of the water is found to be same after adding to salt

3   Appearance of sand

                                     

                              

Dry:

  • The sand is hard and uniform on touch but differs very much under the microscope.That is the size, shape, and composition of the individual particles vary.
  • There are round shaped, needle shaped and a lot of irregular shaped particles
  • Different particles have varying colors such as black, brown, red and so on
  • Size of individual components also differ-there are very small soil particles, big white,black, and red stones and a lot of medium sized components
  • Some particle shows luster, but some are not lustrous.
  • Few particles are transparent, through which the black color of 'X' could be seen.

Wet:

  • The water becomes brown colored
  • Small particles are in constant motion through the water
  • The bigger components appear the same as before.
  • There is no change in size and shape of almost all big particles.
  • The size of very small soil particles reduced, due to separation from each other.
  • The sand is said to be a heterogeneous mixture since different components are present in it.It could be separated under a good microscope by handpicking.

4.   oil and water on plastic

                                     

Oil:

  • It is a little brown colored.Not colorless.
  • It formed a globule with perfect spherical shape through which 'X' could be seen
  • It is more viscous, so have low tendency to flow.
  • A little lustrous

Water:

  • Size and appearance of water is similar to oil.
  • Colorless, completely transparent and nonlustrous.
  • It also forms a spherical globule.It has a tendency to flow and spread in more areas
  • The edges of the globule is flat
  • Water is very much transparent compared to the oil.Size of 'X' is a little bigger when looked through water

5.   baking soda and vinegar

Baking soda, dry:

  • White, shiny, opaque particles with sharp edges.
  • The size of particles differ, but shape and appearance are same.
  • More like powder compared to rock salt.
  • Not lustrous as rock salt.

After combined:

  • When vinegar is added, an immediate reaction occurred.The mass of baking soda is found to be increased with effervescence and the effervescence ceases after some time.
  • Heat is found to be generated
  • The mass of baking soda became porous due to the formation of bubbles
  • The released gas is carbon dioxide and the reaction is
  • The reaction is an acid-base reaction to form salt and water.
  • Vinegar is acetic acid by composition.

Related Solutions

USING MATLAB Part 2: Insert coins For this part, you are going implement the code that...
USING MATLAB Part 2: Insert coins For this part, you are going implement the code that asks the user to enter coins until they have entered enough for the NAU power juice. Open the insert_coins.m file. Initialize total to 0. We do this because initially, no coins have been entered. Using a loop, ask the user to enter a coin until the total matches or exceeds 115 cents. The input should be a char or string, so make sure that...
A)Write the two mathematical equations using the experimental quantities of your experiment. You must remember that...
A)Write the two mathematical equations using the experimental quantities of your experiment. You must remember that both equations must have identical units for both sides of your two equations. I need help regarding my lab assignment, I have no idea how to approach the calculations. The following table is the "Mass data for reaction of NaHCO3-Na2CO3 mixture with HCl" Mass of crucible and cover (g) 24.6073 Mass of crucible, cover and mixture (g) 25.1200 Mass of crucible, cover, and residue...
Explain in detail the experimental procedure you would use to find heat of solution when sodium...
Explain in detail the experimental procedure you would use to find heat of solution when sodium chloride is dissolved into water. (Answer in detail.)
Part 1: Our smoke detectors safe? Part 2: Radon gas is in an insert gas that...
Part 1: Our smoke detectors safe? Part 2: Radon gas is in an insert gas that is not toxic or poisonous, but is radioactive and emits alpha particles. Why is radon dangerous? Part 3: What are the advantages and problems with nuclear energy? Background information: The modern theory of the atom is that the atom consist of a nucleus of protons and neutrons. Electrons surrounding the nucleus, not as particles orbiting the nucleus, but as standing matter waves like the...
I have to develop my own experimental procedure for my lab covering cell culture. We’re using...
I have to develop my own experimental procedure for my lab covering cell culture. We’re using HEK932T cells and I wanted to test the affect salt has on the cells. I know how to culture cells but I’m not sure how to test the cells with the salt. We’re using a 12 well plate and each well is 1 mL. I know how to count the cells but I don’t know how many microliters to add to each well. How...
Experiment: Extraction to seperate benzoic acid and naphthalene. Procedure- Place 2 g of a 1:1 (by...
Experiment: Extraction to seperate benzoic acid and naphthalene. Procedure- Place 2 g of a 1:1 (by weight) mixture of benzoic acid and naphthalene in a small beaker; record the exact mass of the mixture in your notebook. Add 35 mL of dichloromethane to the beaker and stir until the solid mixture has completely dissolved. Carefully pour the solution into a separatory funnel. Add 20 mL of 3.0 M NaOH to the separatory funnel, stopper it, and shake the mixture with...
1. Under the perpetual inventory system, inventory becomes part of cost of goods sold when a...
1. Under the perpetual inventory system, inventory becomes part of cost of goods sold when a company a. receives payment from the customer b. purchases the inventory c. sells the inventory d. pays for the inventory 2. In credit terms of 4/13, n/45, the "4" represents the a. number of days in the discount period b. number of days when the entire amount is due c. full amount of the invoice d. percent of the cash discount 3. Merchandise with...
Procedure 1. Place the current balance assembly on a table opposite a wall or screen which...
Procedure 1. Place the current balance assembly on a table opposite a wall or screen which is several meters away. Using the adjustable feet on the current balance, level the assembly. Make sure that the two conductors are as parallel as possible. A coin may be placed on the mass pan to hold the conductors together if adjustments of the lower conductor height are necessary. Adjust the counterpoise behind the mirror until the conductors are separated by an acceptable distance....
INSERT YOUR ANSWERS UNDER EACH QUESTION – FIVE LINES MAXIMUM 1. Define the term investment and...
INSERT YOUR ANSWERS UNDER EACH QUESTION – FIVE LINES MAXIMUM 1. Define the term investment and specifically describe two (2) factors that would cause it to increase. Be sure you specifically explain how your two factors might affect investment. 2. Specifically identify the two variables that are part of a discussion of the aggregate demand curve and describe the relationship between those variables. Identify which variable changes and describe how it affects the other variable. 3. What according to Keynes...
What is the benefit to using the experimental method when compared with correlational studies? How have...
What is the benefit to using the experimental method when compared with correlational studies? How have cross-sectional and longitudinal studies helped us to understand relationships between health and psychology?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT