chemical tests

Which of the following is a chemical test for oxygen gas?

• relights a glowing splint

• bleaches damp litmus paper white

• pops with a lit splint

• turns limewater cloudy

Which of the following is a chemical test for hydrogen gas?

• relights a glowing splint

• turns limewater cloudy

• bleaches damp litmus paper white

• burns with a pop when lit splint is used

A gas turns damp red litmus paper blue. The gas is ....

• sulfur dioxide

• oxygen

• ammonia

• carbon dioxide

Which gas is formed when a metal reacts with an acid?

• oxygen

• chlorine

• hydrogen

• carbon dioxide

What term is given to a solid formed in a reaction between two solutions?

• Filtrate

• Precipitate

• Residue

• Solution

Cations are ions with what kind of charge?

• positive

• negative

• neutral

• electrostatic

Sodium hydroxide solution can be added to an unknown solution to indicate the presence of....

• Iron (II)

• Iron (III)

• Copper (II)

• All of them

What is observed when sodium hydroxide is added to a solution of Fe²⁺ ions?

• Green precipitate

• Brown precipitate

• Blue precipitate

• White precipitate

In flame testing, what element gives a yellow flame

• Carbon

• Sodium

• Copper

• Lithium

When doing a flame test, what element gives a purple/lilac flame?

• Barium

• Calcium

• Potassium

• Copper