is heated in a flame. The frequency or color of light emitted depends on ference between the excited state and the ground state. a. Write the ground state or full normal electron configurations for the following atoms. 15² 25² p63 5² pc d 1045² 655 P 2 Sr C1 35² 3p5 b. A lithium atom in the excited state contains the same number of electrons as a lithium atom in the ground state. However, in the excited state one or more of the electrons are temporarily located in a higher energy level. Which of the following is the electron configuration for a Li atom in ground state? 1525 Which of the following is an electron configuration for a Li atom in an excited state? Is² 20¹ 1s²3s¹ 1s²2s² 1s² 1s²2s¹ c. Use the diagram at the right to complete the following questions. Which letter represents an electron absorbing energy? Which letter represents an electron releasing energy? Which letter represents what occurs when light is emitted and a colored flame is observed?

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EXPERIMENT D Flame Tests: Which lon Causes the Color?
Corinna Evans
1.
Name
Lab Partner
Pre-Lab Assignment: Flame Tests
The dazzling colors produced by fireworks result from excited gaseous atoms or mol-
ecules emitting light. The normal electron configuration of an atom is known as the
"ground state." In ground state all electrons are in the lowest energy levels available.
When atoms or ions are heated, some electrons may absorb enough energy to allow
them to "jump" to higher energy levels. The atom or ion is then said to be in the "excited
long and will emit energy in
state." The electrons cannot remain in this excited state
the form of light when they return to ground state. It is this light we see when an atom
is heated in a flame. The frequency or color of light emitted depends on the energy dif-
ference between the excited state and the ground state.
C.
a. Write the ground state or full normal electron configurations for the following atoms.
"pc d 1045²
Sr
2s²p63 5²
CL
1s
Зд2 зроб
b. A lithium atom in the excited state contains the same number of electrons as a
lithium atom in the ground state. However, in the excited state one or more of the
electrons are temporarily located in a higher energy level.
Section #
113112023
Which of the following is the electron configuration for a Li atom in ground
state?
1525
Which of the following is an electron configuration for a Li atom in an excited
state?
Is ² 20¹
500
b
1s²
1s²2s¹
1s²3s1
Use the diagram at the right to complete the following questions.
Which letter represents an electron absorbing energy?
a
Which letter represents an electron releasing energy?
Which letter represents what occurs when light is emitted
and a colored flame is observed?
a
CHayden-McNeil, LLC
Ground state
1s²2s²
Excited state
D-3
Transcribed Image Text:EXPERIMENT D Flame Tests: Which lon Causes the Color? Corinna Evans 1. Name Lab Partner Pre-Lab Assignment: Flame Tests The dazzling colors produced by fireworks result from excited gaseous atoms or mol- ecules emitting light. The normal electron configuration of an atom is known as the "ground state." In ground state all electrons are in the lowest energy levels available. When atoms or ions are heated, some electrons may absorb enough energy to allow them to "jump" to higher energy levels. The atom or ion is then said to be in the "excited long and will emit energy in state." The electrons cannot remain in this excited state the form of light when they return to ground state. It is this light we see when an atom is heated in a flame. The frequency or color of light emitted depends on the energy dif- ference between the excited state and the ground state. C. a. Write the ground state or full normal electron configurations for the following atoms. "pc d 1045² Sr 2s²p63 5² CL 1s Зд2 зроб b. A lithium atom in the excited state contains the same number of electrons as a lithium atom in the ground state. However, in the excited state one or more of the electrons are temporarily located in a higher energy level. Section # 113112023 Which of the following is the electron configuration for a Li atom in ground state? 1525 Which of the following is an electron configuration for a Li atom in an excited state? Is ² 20¹ 500 b 1s² 1s²2s¹ 1s²3s1 Use the diagram at the right to complete the following questions. Which letter represents an electron absorbing energy? a Which letter represents an electron releasing energy? Which letter represents what occurs when light is emitted and a colored flame is observed? a CHayden-McNeil, LLC Ground state 1s²2s² Excited state D-3
D-4
EXPERIMENT D Flame Tests: Which lon Causes the Color?
●
●
2. Write correct ionic formulas for the following light emitting compounds (remember
that number of electrons that are given away has to be equal to the number of electrons
that are accepted).
Lithium Carbonate (CO32-)_
Calcium Sulfate (SO4²-)
Strontium Chromate (CrO42-)_
Barium Nitrate (NO3¹-)_
Sodium Chloride
Cu(I) Oxide
blue color
3. In addition to vivid colors, the fireworks also use other visual features such as smoke,
glitter effects, or delay in the firing train.
Write correct ionic formulas for the following compounds used to create these effects:
Ammonium (NH¹+) Chloride,
white smoke
Zinc Oxide
smoke
crackling microstars
delay charge
glitter-delay
Sodium Chloride
Sodium Carbonate
Strontium Acetate
Copper (II) Sulfate
Lithium Carbonate
Potassium Sulfate
Sodium Phosphate
Barium Nitrate
red color
orange color
red color
Bismuth (III) Oxide
Barium Chromate (CrO42-).
Magnesium Carbonate (CO32-).
MATERIALS
Laboratory (Bunsen) Burner and Lighter (or Matches).
Cotton Swabs (or wood sticks can be used with one side wrapped in cheese cloth or
small pieces of cotton).
Approximately 50 mL of Distilled Water.
Approximately 20 mL of Dilute Hydrochloric Acid (3 M HCI).
Spot Plates (or 16 small pieces of paper or weighing dishes).
Compounds:
●
green color
yellow color
●
Copper(II) Oxide
Potassium Nitrate
Cobalt(II) Chloride
Strontium Chloride
Barium Chloride
Potassium Chloride
Lithium Bromide
Transcribed Image Text:D-4 EXPERIMENT D Flame Tests: Which lon Causes the Color? ● ● 2. Write correct ionic formulas for the following light emitting compounds (remember that number of electrons that are given away has to be equal to the number of electrons that are accepted). Lithium Carbonate (CO32-)_ Calcium Sulfate (SO4²-) Strontium Chromate (CrO42-)_ Barium Nitrate (NO3¹-)_ Sodium Chloride Cu(I) Oxide blue color 3. In addition to vivid colors, the fireworks also use other visual features such as smoke, glitter effects, or delay in the firing train. Write correct ionic formulas for the following compounds used to create these effects: Ammonium (NH¹+) Chloride, white smoke Zinc Oxide smoke crackling microstars delay charge glitter-delay Sodium Chloride Sodium Carbonate Strontium Acetate Copper (II) Sulfate Lithium Carbonate Potassium Sulfate Sodium Phosphate Barium Nitrate red color orange color red color Bismuth (III) Oxide Barium Chromate (CrO42-). Magnesium Carbonate (CO32-). MATERIALS Laboratory (Bunsen) Burner and Lighter (or Matches). Cotton Swabs (or wood sticks can be used with one side wrapped in cheese cloth or small pieces of cotton). Approximately 50 mL of Distilled Water. Approximately 20 mL of Dilute Hydrochloric Acid (3 M HCI). Spot Plates (or 16 small pieces of paper or weighing dishes). Compounds: ● green color yellow color ● Copper(II) Oxide Potassium Nitrate Cobalt(II) Chloride Strontium Chloride Barium Chloride Potassium Chloride Lithium Bromide
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