Ion testing

What is the color of the light that sodium compounds give off?

• Green

• Red

• Violet

• Yellow-orange

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Why do you think are there different colors emitted?

• Because of the absorption of heat from the flame

• Because heat is released

• Because of the absorption of light

Tags

NGSS.HS-PS1-2

NGSS.HS-PS4-3

What is the state when electrons move to a higher energy level upon absorption of energy?

• active

• inactive

• excited

• ground

What compound gives off bright red color when heated over a flame?

• Lithium

• Calcium

• Strontium

• Potassium

What particles in the heated compounds are responsible for the production of the colored light?

• proton

• neutron

• electron

• proton and neutron

Tags

NGSS.HS-PS1-2

NGSS.HS-PS4-3

NGSS.HS-PS4-4

What is the color of the light that calcium compounds give off?

• Yellow

• Orange

• Blue-green

• Purple

Tags

NGSS.HS-PS1-1

NGSS.HS-PS4-3

What is the color of the light that potassium compounds give off?

• Yellow-orange

• Purple

• Pinkish red

• Green

Tags

NGSS.HS-PS4-3

What compound gives off pinkish red color when heated over a flame?

• Lithium

• Strontium

• Potassium

• Calcium

Tags

NGSS.HS-PS1-2

A fellow student of yours thought that flame color was based on the element written at the beginning of the compound. Which statement would give evidence to support their claim?

• The flames of LiCl and and NaCl are the same color

• The flames of LiCl and NaCl are different colors

• The flames of Na₂SO₄ and NaCl are different colors

• The flames of Na₂SO₄ and CuCl₂ are different colors

When adding NaOH for a cation test & blue precipitate is formed, the unknown cation is ...

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺