Lesson 3 Compounds

Elements, Compounds, and Reactions

Essential Question;)

• How do atoms combine to form all types of matter?

• Vocabulary: • Compound • Ion • Ionic bond • Covalent bond

What are Compounds?

-A compound is a substance made of two or more elements that are chemically joined in a specific combination. Examples: Citric Acid which is found in oranges, lemons, and other citrus fruits

Properties of Compounds

• Properties of compounds are usually different from the elements from which it is made.

• Compounds are formed from chemical reactions.

Examples: Salt

How Do Atoms Bond?

• Atom bonds are formed by losing electrons, gaining electrons, and/or sharing electrons.

• Ion is an atom that is no longer electrically neutral because it has lost or gained electrons.

• An ionic bond occurs between metals and nonmetals when the substances react to gain or lose electrons in an attraction to become stable.

• A Covalent bond is a chemical bond formed when two atoms share valence electrons. It usually occurs between nonmetals.

What compounds make up common substances?

• Common substances are classified as either organic or inorganic.

• Organic substances all contain carbon and many are made by living things. Examples are the cells and tissues of your body.

• Inorganic substances do not come from living things and most of them do not contain carbon.

• Few carbon compounds that are inorganic substances are carbon dioxide and carbon monoxide; they are called inorganic compounds.

Organic v. Inorganic Substances

Essential Question Answer

• Atoms either gain or lose electrons (ionic bond)or share electrons ( covalent bond) in bonding with other atoms to form substances and become stable.

Homework

• Complete lesson 3 review on page 155.• Write definitions for lesson 3. (page 150)• Find examples of compounds that are covalent

bonded. Make a chart showing its name and its formula.

• Reminder: unit 1 lesson 1 and 2 quick quiz!

Covalently Bonded Compounds

• A covalent compound is made when two or more nonmetal atoms bond by sharing valence electrons. The shared valence electrons between two nonmetal atoms is called a covalent bond. Covalent bonds are formed when two atoms begin sharing electrons.

• Covalent Compounds: Properties, Naming & Formation ...

• study.com/.../lesson/covalent-compounds-properties-naming-formation.htm...

• https://study.com/academy/lesson/endothermic-and-exothermic-reactions.html