Lab 4 Molar Mass CHEM101L
Student Name: Click here to enter text.
Don't use plagiarized sources. Get Your Custom Essay on
CHEM lab 4 and 5
Just from $13/Page
Access Code (located on the lid of your lab kit):
Pre-Lab Questions:
1. Imagine you are a guest speaker at a kindergarten class and you are asked to explain Avogadroâs number. What would you say and why?
2. Draw a diagram explaining the relationship between atoms, moles, and molecules. Insert your drawing with your handwritten name and access code clearly visible.
3. Why is Avogadroâs number referred to as a mole?
Experiment 1: Percent Sugar in Bubble Gum
Table 1: Sucrose Data
Mass of weight boat
Mass of weigh boat + un-chewed gum
|
Mass of un-chewed gum
|
Mass of chewed gum
|
Mass of sugar
|
Percent of sugar
|
|
|
|
|
Click here to enter text. |
Click here to enter text.
Click here to enter text.
Click here to enter text.
Post-Lab Questions
1. What is the percent sugar? Show your calculations.
1. What is the molar mass of sugar C12H22O11? Show your calculations.
1. Convert the mass of dissolved sugar to moles. Show your calculations.
1. Convert the moles of sugar to molecules of sugar. Show your calculations.
1. Convert molecules of sugar to grams of sugar. Show your calculations.
1. Imagine that you used four pieces of gum instead of two. Calculate the number of moles. Show your calculations.
1. How does the mass of the saliva alter the experimental data?
1. Insert a photo of your completed lab with your name and access code handwritten in the background.
Lab 5 Electron Configuration CHEM101L
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit):
Pre-Lab Questions
1. What is electron configuration?
2. How is the light emitted by an atom related to its electron configuration?
Data
Table 1: Results of firework material ignition
|
Substance
|
Observations
|
|
Lithium Chloride
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Click here to enter text. |
|
Sodium Chloride
|
Click here to enter text.
|
Potassium Chloride
|
Click here to enter text.
|
Calcium Chloride
|
Click here to enter text.
Post-Lab Questions
1. Write out the electron configurations for each of the following elements. Potassium is already done as an example for you. HINT: The periodic table is very helpful and can be used as a guide.
|
Element
|
Electron Configuration
|
|
K
|
1s22s22p63s23p64s1
|
|
Li
|
Click here to enter text.
|
Na
|
Click here to enter text.
|
Ca
|
Click here to enter text.
2. What is the approximate wavelength of light emitted by each of the salts?
|
Salt
|
Color
|
Wavelength
|
|
LiCl
|
Click here to enter text.
Click here to enter text.
|
NaCl
|
Click here to enter text.
Click here to enter text.
|
KCl
|
Click here to enter text.
Click here to enter text.
|
CaCl2
|
Click here to enter text.
Click here to enter text.
3. Why does a salt compound give off light or a colored flame when burned?
4. Did sodium chloride and potassium chloride give off similar colors? Why or why not?
Insert photo of your completed lab with your name and access code handwritten in the background:
Lab 4 Molar Mass CHEM101L
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit):
Pre-Lab Questions:
1. Imagine you are a guest speaker at a kindergarten class and you are asked to explain Avogadro’s number. What would you say and why?
2. Draw a diagram explaining the relationship between atoms, moles, and molecules. Insert your drawing with your handwritten name and access code clearly visible.
3. Why is Avogadro’s number referred to as a mole?
Experiment 1: Percent Sugar in Bubble Gum
Table 1: Sucrose Data
Mass of weight boat
Mass of weigh boat + un-chewed gum
|
Mass of un-chewed gum
|
Mass of chewed gum
|
Mass of sugar
|
Percent of sugar
|
|
|
|
|
Click here to enter text. |
Click here to enter text.
Click here to enter text.
Click here to enter text.
Post-Lab Questions
1. What is the percent sugar? Show your calculations.
1. What is the molar mass of sugar C12H22O11? Show your calculations.
1. Convert the mass of dissolved sugar to moles. Show your calculations.
1. Convert the moles of sugar to molecules of sugar. Show your calculations.
1. Convert molecules of sugar to grams of sugar. Show your calculations.
1. Imagine that you used four pieces of gum instead of two. Calculate the number of moles. Show your calculations.
1. How does the mass of the saliva alter the experimental data?
1. Insert a photo of your completed lab with your name and access code handwritten in the background.
Lab 5 Electron Configuration CHEM101L
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit):
Pre-Lab Questions
1. What is electron configuration?
2. How is the light emitted by an atom related to its electron configuration?
Data
Table 1: Results of firework material ignition
|
Substance
|
Observations
|
|
Lithium Chloride
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Click here to enter text. |
|
Sodium Chloride
|
Click here to enter text.
|
Potassium Chloride
|
Click here to enter text.
|
Calcium Chloride
|
Click here to enter text.
Post-Lab Questions
1. Write out the electron configurations for each of the following elements. Potassium is already done as an example for you. HINT: The periodic table is very helpful and can be used as a guide.
|
Element
|
Electron Configuration
|
|
K
|
1s22s22p63s23p64s1
|
|
Li
|
Click here to enter text.
|
Na
|
Click here to enter text.
|
Ca
|
Click here to enter text.
2. What is the approximate wavelength of light emitted by each of the salts?
|
Salt
|
Color
|
Wavelength
|
|
LiCl
|
Click here to enter text.
Click here to enter text.
|
NaCl
|
Click here to enter text.
Click here to enter text.
|
KCl
|
Click here to enter text.
Click here to enter text.
|
CaCl2
|
Click here to enter text.
Click here to enter text.
3. Why does a salt compound give off light or a colored flame when burned?
4. Did sodium chloride and potassium chloride give off similar colors? Why or why not?
Insert photo of your completed lab with your name and access code handwritten in the background:
