Amy Nguyen
H18
November 4, 2014
Chemistry
Flame Test Experiment: Lab Report
Purpose: To demonstrate and classify the characteristics of a chemical reaction.
Objective: Describe the difference between a physical and chemical change.
Data Table:
Chemical Compounds
|
Element Symbols
|
Characteristics
|
Barium Chloride
|
BaCl2
|
Green
|
Calcium Chloride
|
CaCl2
|
Orange
|
Lithium Chloride
|
LiCl
|
Red and hot pink, residue on the bottom
|
Potassium Chloride
|
KCl
|
Purple and blue
|
Sodium Chloride
|
NaCl
|
Orange-yellow
|
Strontium Chloride
|
SrCl2
|
Red-orange
|
Unknown??
|
BaCl + NaCl
|
Green and orange-yellow
|
Dry Ice
|
CO2
|
Cold, clear liquid, -109 F
|
Analysis Questions:
- Three indicators that determined that a chemical change has occurred is the color change, gas production, and temperature change.
- When a chemical change takes place in the flame test light is emitted. Wavelengths are created by the atoms that are being placed into the heat; the electrons energy raises higher and higher. However, it returns to its lowest energy level when the heat is removed.
- From the periodic table these elements exists in two groups. For instance Barium, Calcium, and Strontium are apart of Alkaline Earth Metals. Sodium, Potassium, and Lithium are Alkali Metals.
- Two elements that give off the same spectrum of color is Calcium and Sodium. However, they do not give off the exact same color, but they do give off similar colors. For example they give off an orange color. The reason being that they give off the same spectrum of color is because they are from the same group in the periodic table.
- In a chemical reaction, catalyst are substances that helps speed up the chemical reaction. In this reaction the catalyst is when the heat causes electrons energy levels to waver the colors in the end that are being given off.
- One potential disadvantage in the flame test experiment is when one element can be obscured by another element because of the previous coloured light that was emitted.
Sources:
