3.2 How Atoms Combine

By the end of this lesson you will be able to:
- Describe the chemical bonds that unite atoms to form compounds
- Relate the nature of chemical bonds that hold compounds together to the
physical structures of compounds
- Distinguish among different types of mixtures and solutions
How Atoms Combine
Compound –
Chemical bonds –
Covalent bonds –
Molecule –
What charge do molecules have?
The chemical formula for molecules is written by listing the ___________ of each
_______ and the number of them as a _______________.
H2O –
CO2 –
Polar bond –
Ion –
How does an atom become positively charged?
How does an atom become negatively charged?
Ionic bond –
Use appendix G on page 917 to help you with the problem solving lab on
page 63. With your partner try to answer all the questions, using what you
have learned about atoms.
What is a metallic bond?
Chemical reaction –
Look at the following equation:
6H2O + 6CO2
C6H12O6 + 6O2
What is H2O?
What is CO2?
Does this equation balance?
What is this equation showing?
Mixtures and Solutions
Mixture –
Heterogeneous mixture –
Solution or Homogeneous mixture –
Place the following mixtures in the proper box.
Salad; Coffee; Atmosphere; pepperoni pizza; fruit salad; pudding;
Heterogeneous mixture
Homogeneous mixture
Homework: On a separate sheet of paper answer questions 1-4 on page 66.