Chemistry Honors – Class 07

Dates

• Period A: Tuesday, January 19th
• Period B: Wednesday, January 20th
• Period F: Wednesday, January 20th

Exam Recap

• lots of homework to return
• questions?

Activity – Counting By Mass

Data

• A – Count out 25 pieces of one item
• B – Determine the mass of these items
• C – Grab a handful of the same item (without counting)
• D – Find the mass of the handful
• E – Count number of items in the “handful” sample
• F – Record observations of each item
• Repeat for as many materials as possible

Calculations

• G – Determine the mass of one item using A/B
• H – Predict the number of items in handful using G
• I – Compare H to E (percent error formula)

More Calculations (using calculation G)

• J – Determine the mass of one dozen items
• K – Determine the mass of one million items
• L – Determine how many items makes 1.000 kg
• M – Determine the mass of 1 mole of items (1 mole = 6.02 x 10²³)
• N – Determine the moles of each item that are equivalent to 543 pieces

Discussion

• How do I show my work in LNB?
• How do I show calculations in my LNB?
• How many examples do I need to show?
• What is a data table?
• What is a calculation table?
• Note – sample LNB format posted in Schoology

Homework

• Finish all work from the lab in the LNB (by next class meeting)