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.