Chemistry: Hydrogen and Oxygen Quiz

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Questions and Answers

What is the correct ratio of hydrogen to oxygen produced during the electrolysis of water?

3:1
1:2
2:1 (correct)
1:1

Which gas will help an incense stick to burn brightly when inserted into a test tube?

Oxygen (correct)
Carbon dioxide
Nitrogen
Hydrogen

What observation is made when a burning incense stick is inserted into hydrogen gas?

It burns with a bright flame.
It continues to burn normally.
It produces smoke.
It extinguishes immediately. (correct)

What is the method for collecting hydrogen gas when produced in a reaction?

Inverting a test tube above the reaction (A) Signup and view all the answers

What happens when oxygen and hydrogen react?

They produce water. (D) Signup and view all the answers

Which metal does not react with cold water to release hydrogen?

Iron (B) Signup and view all the answers

In a Hoffmann Water Voltameter, what does the presence of water droplets on the test tube indicate?

A reaction between gases is occurring. (B) Signup and view all the answers

How can hydrogen be prepared in a laboratory setting?

By treating zinc with hydrochloric acid (D) Signup and view all the answers

Flashcards

Electrolysis of Water

The process of breaking down water into its component elements, hydrogen and oxygen, using electricity.

Hoffmann Water Voltameter

A device used to demonstrate the electrolysis of water, consisting of two vertical test tubes connected by a horizontal tube. It allows for the separate collection of hydrogen and oxygen gas.

Hydrogen

A flammable, colorless, odorless gas that is the lightest element on the periodic table. It burns with a pale blue flame and is frequently used as a fuel source.