Chemistry (Period 5,7) (Chatsworth Charter High School & G+STEAM Magnet Center) //www.chatsworthhs.org/apps/classes/622681/assignments/ Class Name: Chemistry (Period 5,7) Instructor(s): Steve West en-us SchoolSitePro <![CDATA[Due: 12/12/2014]]> //www.chatsworthhs.org/homeworkItem3709441 //www.chatsworthhs.org/apps/classes/622681/assignments/ Attached are the files for Table of Reduction Potentials and Electronegativities
]]> Thu, 11 Dec 2014 10:09:04 PST <![CDATA[Due: 12/12/2014]]> //www.chatsworthhs.org/homeworkItem3703885 //www.chatsworthhs.org/apps/classes/622681/assignments/ Your lab experiment should be complete by now and the discussion is due today.
Here are the guidelines. Write a meaningful paragraph that addresses the following:
  • Why the copper penny turns green
  • Why the metal wire around the penny corroded (oxidized) faster than the metal wire that was by itself.
  • In terms of the oxidation-reduction chemistry: why you added salt to the water.
  • How the environment you set up (acid) accelerated up the process.
  • Write a balanced net ionic equation to show the oxidation of Iron metal by copper ions in solution.
  • Write a balanced equation to show iron oxidizing (by oxygen in the air) to rust.
 Re-reading the Statue of Liberty article will help with your discussion.

]]> Thu, 11 Dec 2014 14:26:29 PST <![CDATA[Due: 12/10/2014]]> //www.chatsworthhs.org/homeworkItem3703898 //www.chatsworthhs.org/apps/classes/622681/assignments/ Read the attached file for our final lab of this semester.  Start the lab as soon as possible.  It may take a day or two to complete the corrosion (oxidation) process.  We will talk about the discussion write up today in class.
]]> Mon, 08 Dec 2014 14:27:33 PST <![CDATA[Due: 12/08/2014]]> //www.chatsworthhs.org/homeworkItem3699045 //www.chatsworthhs.org/apps/classes/622681/assignments/ Write correctly balanced chemical equations for the following reactions that you carried out in lab on Thursday:
  1. aluminum metal solid + copper (II) sulfate solution forms solid copper metal + aluminum sulfate solution.
  2. zinc metal solid + lead (II) nitrate solution forms solid lead metal + zinc (II) nitrate solution.
  3. zinc metal solid + copper (II) sulfate solution forms solid copper metal + zinc (II) sulfate solution.
  4. iron metal solid + lead (II) nitrate solution forms solid lead metal forms solid lead metal + iron (III) nitrate solution.
Read the attached file for our final lab of this semester.  Start the lab as soon as possible.  We will talk about the discussion write up on Monday

]]> Mon, 08 Dec 2014 14:23:25 PST <![CDATA[Due: 12/04/2014]]> //www.chatsworthhs.org/homeworkItem3695126 //www.chatsworthhs.org/apps/classes/622681/assignments/ Section 8.2 (8-9) and Chapter 18 (18-20)
]]> Wed, 03 Dec 2014 09:33:34 PST <![CDATA[Due: 11/29/2014]]> //www.chatsworthhs.org/homeworkItem3687380 //www.chatsworthhs.org/apps/classes/622681/assignments/
The following homework is due on Tuesday (12/2) when we return from the week long break.  You will be forming crystal precipitates which take time (several days), so you should start as soon as possible.  The following you tube link will guide you through the process. They use table salt (sodium chloride, NaCl) in the video.  Try one experiment with table salt and a second one with baking soda (sodium bicarbonate, NaHCO3).  Bring your results (from both experiments) in for one extra credit point. 
 
 
 The process is not a chemical reaction forming a precipitate as we did in lab, but rather a dehydration to the point that the solid crystallizes out (physical change).  It is the analogous to the process that occurs in caves when stalactites form.  Write a one-paragraph discussion that explains your observations of the solid formation.  Consider the process to be the reverse of the dissolving process, and explain it in terms of enthalpy of hydration, lattice energy, breaking and forming bonds, changes in entropy, predicted changes in temperature of the solution, predicted changes in the electrical conductivity of the solution.  Sketch a particle-level model of the process and write a balanced equation for the process.  just remember that it is a physical change taking place not a chemical one.

]]> Wed, 26 Nov 2014 08:54:49 PST <![CDATA[Due: 11/28/2014]]> //www.chatsworthhs.org/homeworkItem3687379 //www.chatsworthhs.org/apps/classes/622681/assignments/
The following homework is due on Tuesday (12/2) when we return from the week long break.  You will be forming crystal precipitates which take time (several days), so you should start as soon as possible.  The following you tube link will guide you through the process. They use table salt (sodium chloride, NaCl) in the video.  Try one experiment with table salt and a second one with baking soda (sodium bicarbonate, NaHCO3).  Bring your results (from both experiments) in for one extra credit point. 
 
 
 The process is not a chemical reaction forming a precipitate as we did in lab, but rather a dehydration to the point that the solid crystallizes out (physical change).  It is the analogous to the process that occurs in caves when stalactites form.  Write a one-paragraph discussion that explains your observations of the solid formation.  Consider the process to be the reverse of the dissolving process, and explain it in terms of enthalpy of hydration, lattice energy, breaking and forming bonds, changes in entropy, predicted changes in temperature of the solution, predicted changes in the electrical conductivity of the solution.  Sketch a particle-level model of the process and write a balanced equation for the process.  just remember that it is a physical change taking place not a chemical one.

]]> Wed, 26 Nov 2014 08:54:36 PST <![CDATA[Due: 11/26/2014]]> //www.chatsworthhs.org/homeworkItem3687378 //www.chatsworthhs.org/apps/classes/622681/assignments/
The following homework is due on Tuesday (12/2) when we return from the week long break.  You will be forming crystal precipitates which take time (several days), so you should start as soon as possible.  The following you tube link will guide you through the process. They use table salt (sodium chloride, NaCl) in the video.  Try one experiment with table salt and a second one with baking soda (sodium bicarbonate, NaHCO3).  Bring your results (from both experiments) in for one extra credit point. 
 
 
 The process is not a chemical reaction forming a precipitate as we did in lab, but rather a dehydration to the point that the solid crystallizes out (physical change).  It is the analogous to the process that occurs in caves when stalactites form.  Write a one-paragraph discussion that explains your observations of the solid formation.  Consider the process to be the reverse of the dissolving process, and explain it in terms of enthalpy of hydration, lattice energy, breaking and forming bonds, changes in entropy, predicted changes in temperature of the solution, predicted changes in the electrical conductivity of the solution.  Sketch a particle-level model of the process and write a balanced equation for the process.  just remember that it is a physical change taking place not a chemical one.

]]> Wed, 26 Nov 2014 08:54:23 PST <![CDATA[Due: 11/21/2014]]> //www.chatsworthhs.org/homeworkItem3668712 //www.chatsworthhs.org/apps/classes/622681/assignments/ Assessment Chemical Reactions in aqueous solution (precipitation reactions), Lattice energy, Enthalpy of Hydration, Solubility of solids in solution, melting points; balancing equations, identifying reaction types
 
Homework due today: pick three reactions that formed precipitates in experiment #6 part 2, and do as we did in class today: use the solubility table from your text to identify the precipitate, write the correct formulas for the reactants and products and write a balanced equation, ionize the aqueous species and eliminate the spectator ions, write the balanced net ionic equation  for the precipitation, and for one of them sketch a particle level representation.

]]> Tue, 18 Nov 2014 19:26:25 PST <![CDATA[Due: 11/21/2014]]> //www.chatsworthhs.org/homeworkItem3679147 //www.chatsworthhs.org/apps/classes/622681/assignments/
The following homework is due on Tuesday (12/2) when we return from the week long break.  You will be forming crystal precipitates which take time (several days), so you should start as soon as possible.  The following you tube link will guide you through the process. They use table salt (sodium chloride, NaCl) in the video.  Try one experiment with table salt and a second one with baking soda (sodium bicarbonate, NaHCO3).  Bring your results (from both experiments) in for one extra credit point. 
 
 
 The process is not a chemical reaction forming a precipitate as we did in lab, but rather a dehydration to the point that the solid crystallizes out (physical change).  It is the analogous to the process that occurs in caves when stalactites form.  Write a one-paragraph discussion that explains your observations of the solid formation.  Consider the process to be the reverse of the dissolving process, and explain it in terms of enthalpy of hydration, lattice energy, breaking and forming bonds, changes in entropy, predicted changes in temperature of the solution, predicted changes in the electrical conductivity of the solution.  Sketch a particle-level model of the process and write a balanced equation for the process.  just remember that it is a physical change taking place not a chemical one.

]]> Fri, 21 Nov 2014 10:26:08 PST