Quantization energy lab report answer key PDF

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Summary

This is the Lab report for the Quantization of energy Lab, This includes answers and opinions of mine....

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Quantization of Energy Lab Report Instructions: For this investigative phenomenon, you will need to determine the composition of the new star using a spectrometer. This will help scientists determine the star's approximate age. You will complete Part I and Part II trials of the experiment. Record your observations and test measurements in the lab report below. You will submit your completed report.

Title: Quantization of energy Lab

Objective(s): to measure the approximate age of a new star.

Hypothesis: Make a prediction that describes the relationship between the composition of an unknown substance and its emission spectrum. For example, “If each element can be identified by its spectrum and wavelength, then the elements of an unknown star can be determined." Procedure: Access the virtual lab and complete Part I and Part II trials of the experiment. Because this lab is virtual, summarize the steps in which data were collected for the samples. In addition, list and explain your controlled variables, independent variable, and dependent variable for this lab.

For the flame test I cleaned the wire with hydrochloric acid and burned it in a flame until no color showed, then I dipped it in a known liquid and burned it on a flame, and noted the color.

For the spectroscopy, I used different flames and projected them through a slit which projected the light through a prism which finally projected the colors onto the spectrum. Then I noted each color and the wavelength values and noted them in my data table.

Materials: Quantization of Energy Virtual Lab

Variables: Remember, controlled variables are factors that remain the same throughout the experiment. An independent (test) variable changes so that the experimenter can see the effect on other variables. The dependent (outcome) variable will change in response to the test variable. Controlled variables: the controlled variables in the flame test were the wire and hydrochloric acid. And in the spectroscopy were the slit, prism and spectrum, and units in which the wavelengths were recorded. Independent variable: in the flame test, the different known liquids, in the spectroscopy, were the different flames. Dependent variable: in the flame test, the different colors of the flames when the known liquids were put over the flame. In the spectroscopy, the different colors and wavelengths. Summary of Steps: Flame test: burn the different liquids over heat, after cleaning wire with hydrochloric acid. And test for color of flames. Note down data. Spectroscopy: use each flame and project through slit and prism onto spectrum to find colors and wavelengths. Note down data.

Data: Type the results of your tests in the data table below. The saved results of your measurements can also be found by selecting the data table button within the virtual lab. Don't forget to record measurements with accuracy, precision, and appropriate significant figures. Part I: Flame Tests Solution

Element Name

Color Description

Known One

BARIUM

green flame

Known Two

CALCIUM

dark red flame

Known Three

SODIUM

gold yellow flame

Known Four

RUBIDIUM

violet flame

Known Five

POTASSIUM

dark blue flame

Known Six

LITHIUM

dark pink flame

Unknown One

UNKNOWN 1/ lithium

dark pink flame

Unknown Two

UNKNOWN 2/ potassium

dark blue flame

Part II: Spectrometry Known Elements Spectrum Hydrogen Line

Helium

Sodium

Neon

Mercury

1

purple, 410nm

indigo, 450nm

light yellow, 580nm

purple, 420nm

purple, 430nm

2

blue, 450nm

green, 510nm

dark yellow, 585nm

neon green, 515nm

indigo, 445nm

3

bright green, 510nm

yellow, 585nm

orange, 590nm

dark green, 520nm

neon green, 538nm

4

light green, 540nm

light red, 690nm

light green, 528nm

light green, 550nm

5

neon yellow, 550nm

dark red, 730nm

yellow, 575nm

yellow, 570nm

6

gold yellow, 570nm

orange, 580nm

red, 675nm

7

light red, 655nm

light red, 695nm

dark red, 690nm

8

dark red, 680nm

dark red, 705nm

darker red, 710nm

9

darker red, 700nm

darker red, 720nm

10

blood red, 745nm

Star Composition Line in Star Spectrum

Color

Wavelength

1

purple

410nm

2

violet

415nm

3

indigo

435nm

4

cyan

500nm

5

light green

550nm

6

yellow

580nm

7

red

695nm

8

dark red

705nm

9 10 11 12 13 14 15 16 17 18

Conclusion Write a conclusion statement that addresses the following questions:

• • •

Based on your data, which unknown elements make up this star? Do your data support or fails to support your hypothesis (include examples)? How do you think the investigation can be explored further?

Based on my data I think the star is made up of mercury because the wavelengths are more or less very similar to each other. My data supports my hypothesis because by finding out the spectrum and wavelengths of the star we could find its elements, I think it can because there is so much more we can find out with this experiment like how old the star is how long approximately it might live etc.

Post-Lab Reflection Questions Answer the reflection questions using what you have learned from the lesson and your experimental data. It will be helpful to refer to your chemistry journal notes. Answer questions in complete sentences. 1. In Parts I and II of the lab, what happened to the electrons of each element to produce the different colors of light? Explain your answers using important terms from the lesson and information provided in the laboratory. As the atoms are heated, they get excited and are able to move from their ground state to higher energy levels, and while they come back down, they emit photons of very specific energy. This energy makes particular wavelengths of light and so produces particular colors of light. 2. Stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. Based on your data, is the newly discovered star a younger star? Explain your answer. The star is made up of lithium, mercury, sodium, hydrogen, helium, and neon. It contains both hydrogen and helium, and old stars are heavier and do not include these 2 elements, so I believe this star is a new star....