Chemical Properties of Hydrogen

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Questions and Answers

What is a characteristic of a compound?

It is composed of atoms of two or more elements chemically united in fixed proportions (correct)

It has a variable composition

It is a mixture of two or more pure substances

It can be separated into its components by chemical means

What is an example of a solution?

Cement

A sports drink (correct)

Soft drinks

Air

How can salt be recovered from a water solution?

By filtering the solution

By chemical reaction with another substance

By heating the solution and evaporating it to dryness (correct)

By electrolysis

What is a characteristic of a heterogeneous mixture?

The composition is not uniform Signup and view all the answers

What is a characteristic of a mixture?

It is a combination of two or more pure substances Signup and view all the answers

What can be done to any mixture?

It can be separated into its pure substances by physical means Signup and view all the answers

What is the key characteristic of a chemical change?

The formation of new substances with different properties and composition Signup and view all the answers

What is the result of burning hydrogen gas in oxygen gas?

The formation of a different chemical substance with different properties Signup and view all the answers

What is an example of a physical change?

The change of ice into water and water into steam Signup and view all the answers

What is the result of heating a pure copper wire in a burner flame?

The formation of a new chemical substance called copper(II) oxide Signup and view all the answers

What is a characteristic of physical changes?

The change of state of matter without an accompanying change in composition Signup and view all the answers

What is the difference between physical and chemical changes?

Physical changes involve no change in composition, while chemical changes involve the formation of new substances with different properties and composition Signup and view all the answers

What is the key difference between the iron-sand mixture and a compound?

A compound can only be separated by chemical methods Signup and view all the answers

What is the characteristic of particles in a solid state?

They cling rigidly to one another Signup and view all the answers

What is the characteristic of particles in a liquid state?

They are close together but are free to move around Signup and view all the answers

What is an example of a substance that exists in three physical states?

Water Signup and view all the answers

What is the characteristic of crystalline solids?

They exist in regular, repeating, three-dimensional patterns Signup and view all the answers

What is the term used to describe solids that do not have a regular, geometric pattern?

Amorphous Signup and view all the answers

Study Notes

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Description

Understanding chemical properties of hydrogen including its reaction with oxygen to form water and types of changes in matter.