Inorganic Chemistry: Chemical Tests

What color does anhydrous copper(II) sulfate turn when water is added?

• Red

• Green

• Blue

• Yellow

What is the melting point of pure water at 1 atmosphere pressure?

• 0°C

• 100°C

• -1°C

• 50°C

Tags

NGSS.MS-PS1-4

What is the purpose of a flame test?

• To show the presence of certain metal ions (cations) in a compound.

• To measure the temperature of a flame.

• To determine the pH level of a solution.

• To identify the presence of non-metal elements.

What color is associated with lithium ions in a flame test?

• Red

• Yellow

• Lilac

• Blue-green

What is the color observed for sodium ions in a flame test?

• Red

• Yellow

• Lilac

• Orange-red

Fill in the blank: The flame color for potassium ions is _______.

• Lilac

• Red

• Green

• Blue

What precipitate color indicates the presence of copper(II) ions?

• Blue

• Orange-brown

• Red

• Yellow

What is the precipitate formed when iron(III) ions react with sodium hydroxide?

• Iron(III) hydroxide

• Iron(II) chloride

• Sodium chloride

• Iron(III) sulfate

Explain the process of testing for cations using sodium hydroxide solution.

• The process involves adding sodium hydroxide to the solution and observing the color change or precipitate formation.

• The process involves heating the solution and observing the color change.

• The process involves adding hydrochloric acid to the solution and observing the color change.

• The process involves adding sodium chloride to the solution and observing the color change.

What is the precipitate formed when Fe²⁺ ions react with 2OH⁻?

• Fe(OH)₃

• Fe(OH)₂

• FeO

• Fe₂O₃