lecture 10 - BIO 311C February 11, 2008 Graded exams will...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: BIO 311C February 11, 2008 Graded exams will be returned during discussion periods today and tomorrow. If you believe your Exam 1 has been scored inaccurately, take your exam to Jingjie and explain your concern to her on or before this Friday, Feb. 15. If you still have a concern, then please see me. We will not consider any changes after noon on Monday, Feb. 18. The average score for Exam 1 was 71%. The Standard Deviation was 16%. 13% of students who took Exam 1 received a grade of 90%. Ways to Express the Formula of Water H 2 O Chemical formula HOH Structural formulas O Stereo formula 105 H H * H OH or Polarity of Water O H H * y y y y - + Water is a polar molecule because: 1. it's bond angle isn't 180, making the molecule asymmetrical, 2. its oxygen atom is much more electronegative than the hydrogen atoms so its covalent bonds are polar covalent bonds . 3. Two lone pairs of electrons (negative charges) on the oxygen atom project away from the hydrogen atoms. y y y y Atom Chemical Symbol Covalency Electronegative Hydrogen H 1 Oxygen O 2 9 9 Carbon C 4 Nitrogen N 3 9 Phosphorous P 5 Sulfur S 2 * O and N form polar covalent bonds when bonded to H, C, S or P....
View Full Document

Page1 / 26

lecture 10 - BIO 311C February 11, 2008 Graded exams will...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online