http://www.ck12.org Chapter 3. Chemical Interactions
Summary
- A compound is a unique substance that forms when two or more elements combine chemically.
- A compound always consists of the same elements in the same ratio. If the same elements combine in different
ratios, they form different compounds. - Types of compounds include covalent and ionic compounds. They differ in the nature of the bonds that hold
their atoms or ions together.
Vocabulary
- compound: Unique substance that forms when two or more elements combine chemically.
Explore More
Watch the video about compounds at the following URL, and then answer the questions below. http://www.youtu
be.com/watch?v=LRVW0tgSLRI
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/82366- What force holds together atoms in compounds?
- Name a gas that consists of two atoms of the same element bonded together. Do the molecules of this gas
represent a compound? Why or why not? - Identify at least one property of water that differs from the properties of the elements that form it.
- Which two elements make up the compound named butane? What is the ratio of these two elements in butane?
How would you use chemical symbols to represent butane?
Review
- What is a compound?
- A mixture is a combination of two or more substances in any proportions. An example of a mixture is
lemonade, which contains water, lemon juice, and sugar. How do compounds differ from mixtures such as
lemonade? - Compare and contrast ionic and covalent.