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?

<p>The composition is not uniform (B)</p> Signup and view all the answers

What is a characteristic of a mixture?

<p>It is a combination of two or more pure substances (B)</p> Signup and view all the answers

What can be done to any mixture?

<p>It can be separated into its pure substances by physical means (A)</p> Signup and view all the answers

What is the key characteristic of a chemical change?

<p>The formation of new substances with different properties and composition (A)</p> Signup and view all the answers

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

<p>The formation of a different chemical substance with different properties (A)</p> Signup and view all the answers

What is an example of a physical change?

<p>The change of ice into water and water into steam (C)</p> Signup and view all the answers

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

<p>The formation of a new chemical substance called copper(II) oxide (A)</p> Signup and view all the answers

What is a characteristic of physical changes?

<p>The change of state of matter without an accompanying change in composition (A)</p> Signup and view all the answers

What is the difference between physical and chemical changes?

<p>Physical changes involve no change in composition, while chemical changes involve the formation of new substances with different properties and composition (C)</p> Signup and view all the answers

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

<p>A compound can only be separated by chemical methods (B)</p> Signup and view all the answers

What is the characteristic of particles in a solid state?

<p>They cling rigidly to one another (C)</p> Signup and view all the answers

What is the characteristic of particles in a liquid state?

<p>They are close together but are free to move around (D)</p> Signup and view all the answers

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

<p>Water (A)</p> Signup and view all the answers

What is the characteristic of crystalline solids?

<p>They exist in regular, repeating, three-dimensional patterns (A)</p> Signup and view all the answers

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

<p>Amorphous (D)</p> 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.

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