Flame Test Assessment

What color was observed for strontium chloride?

• White crystalline solid
• Blue powder
• Yellow liquid
• Red gas

What color was observed when Sodium chloride (NaCl) was burned?

• Green
• Bright yellow
• Blue
• Red

What color did you observe when Lithium chloride (LiCl) was burned?

• Green
• Red
• Blue
• Yellow

Match the following elements to their correct energy levels and corresponding electrons

• 5s²

• Strontium (Sr)

• 6s²

• Copper (Cu)

• 3s¹

• Lithium (Li)

• 2s¹

• Sodium (Na)

• 3d¹⁰ 4s¹

• Barium (Ba)

Tags

NGSS.HS-PS1-1

Why does each chemical give off a different color when burned?

• Each chemical gives off a different color when burned due to the unique energy levels of their electrons.
• The color change is due to the presence of water vapor in the air.
• All chemicals burn with the same color regardless of their composition.
• Different colors are caused by the temperature of the flame.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

1. The energy of visible light increases from the least energetic color, red, to the most energetic color, violet. List the ions used the flame tests in increasing order of the energy of their emitted light. 

• lithium, sodium, barium, calcium, potassium, copper
• sodium, lithium, potassium, barium, copper, calcium
• copper, barium, potassium, calcium, sodium, lithium
• lithium, sodium, calcium, cobalt, strontium,

Tags

NGSS.HS-PS1-2

NGSS.HS-PS4-1

NGSS.HS-PS4-3

For unknown 1, what salt did you identify the unknown to be, explain your reasoning.

• Potassium bromide (KBr)
• Sodium chloride (NaCl)
• Calcium carbonate (CaCO3)
• Magnesium sulfate (MgSO4)

Tags

NGSS.HS-PS1-2

A local priest has claimed that he can directly talk to the gods, such as Zeno and Ryuk. As a scientist you are highly skeptical of his claims. After going to see this priest it turns out that he is turning flames different colors by throwing different ground minerals on to the flame. Based on what you experienced in the lab how would you refute the claims made by the priest.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4