Provide hands-on activities for practice and mastery. Check for understanding of concepts and skills by using relevant standard materials, i.e. worksheets, text problems, workbooks, teacher prepared exercises, etc.
Text problems; teacher questions; guided practice.
Objective: To use new vocabulary and practice new calculations.
Activity: 1. Students complete assigned problems in text.
2. Students answer teacher-prepared questions, such as:
"How many fingers are on a mole of hands?"
"How many legs are on a mole of insects?"
"How many moles of toes would be on 50 million frogs?"
3. Students are given an iron nail and a balance. Their task is to determine the number of atoms in the nail.
4. Working in pairs, each is given a sample of a common element or compound. They must calculate the number of grams in exactly 1 mole of their substance. Then they will measure this amount of the substance in a beaker. Students then observe and compare the various 1.00 mole samples that were measured by each group. They should see that 1.00 mole of one substance does not weigh the same nor take up the same volume as 1.00 mole of another substance. They should be reminded of the previous activity when they wondered if is was possible to know the number of atoms or molecules in an element or compound.
