Announcements Textbook homework due Friday in discussion (pg. 16)

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Announcements Textbook homework due Friday in discussion (pg. 16) Be respectful – no electronics please! Announcements Textbook homework due Friday in discussion (pg. 16) Electronic HW #1 (Lon-Capa) Wednesday 10:00 pm Pre & Post-lecture Assignments (Lon-Capa) 8:00 am Tuesday & Thursday Lab write-ups must be your own. What to memorize for exam.

By the Exam… Know the polyatomic ions and charges (Bottom of periodic practice table). Know common ions and symbols (Should already be labeled on your periodic table). Know covalent prefixes (Table 5.3).

Office Hours Every day after lecture until 11:30 in the Chemistry Library Conference room Tomorrow 1:30-3 pm (2026 CA) TAs available in the Chemistry Learning Center (2021 Chem Annex) 9 am – 5 pm Monday - Friday

Exam Info Evening Exams 7:00 pm Emphasis is on understanding First one on Tuesday February 12th Conflict exam Same Day 5:00 pm Emphasis is on understanding

Exam Info 40% Basic Knowledge & Skills 40-50% Application Questions (Pre/Post-lecture questions, book problems) 40-50% Application Questions (Lon-Capa homework questions, lab questions, lecture demonstrations) 10-20% New Problems (Same material, but connected in different ways, or extensions of other problems)

Exam Info 15 Multiple Choice Questions 2 Multi-part free response questions You will be asked to explain. You will be asked questions that link multiple topics together. You will be asked questions that you have not seen before that test your understanding and reasoning skills.

To discuss… You have a pile of 100.0 grams of dimes. You want a pile of pennies that has the same number of coins as the dimes pile. What mass of pennies do you need? What information do you need to solve this problem? How would you use that information?

----------------------------------------- You have a pile of 100.0 grams of dimes. You want a pile of pennies that has the same number of coins as the dimes pile. What mass of pennies do you need? Mass of a dime is 2.6 grams. Mass of a penny is 3.1 grams ----------------------------------------- Mass ratio of a dime to a penny is 5:6.

To discuss… You have a sample of 10.0 grams of copper. You want a sample of aluminum that has the same number of atoms as this copper. What mass of aluminum do you need?

Periodic Table

Clicker #1 Select the sample that has the lowest mass. 1.0 mol silicon 1.0 mol nitrogen gas 1.0 mol oxygen gas All three of the samples (a. – c.) above have approximately the same mass. Only two of the samples (a. – c.) above have approximately the same mass.

Clicker #2 Which sample contains a greater number of atoms? 10.0 g Cu or 10.0 g Al A) 10.0 g Cu B) 10.0 g Al

Discuss… You have a sample of 10.0 grams of copper. You want a sample of aluminum that has the same number of atoms as this copper. What mass of aluminum do you need?

What is incorrect about the following set-up?  

Clicker #3  

Joke What do you have when you see a mole of moles digging a mole of holes? A bunch of molasses