Students continue work on Acid-Base activity using the marshmallows. What is the difference between how a strong base and a weak base dissociate? There will be a quiz on Th 3-3-11 on acids and bases and the pH scale. The map below shows the pH of precipitation (rain/snow) across the US. Note that all rainwater is slightly acidic (how do you know this?). Why would the industrial NE have rain that is called “acid rain?”
Students continued to work on the marshmallow acid-base activity in Chapter 5. These Smartboard notes 2-25-11 might help. What does the diagram below show?
Twenty five questions (PSSA Practice #3) that deal with topics that will be on the PSSA exam. How are you doing? What strategies are you learning? How will you prepare for the exams?
If time, students take a look at the pH activities below. Pretty cool! Click on image to access site and then choose the green RUN NOW button. Your assignment is to comment on one of these simulations. Include 1) something you already knew 2) something you learned, and 3) a question that you have. Mention if you were using the “pH Scale” or the “Acid-Base” activity.
Students continue to work on Acid-Base activity in Ch 5 using marshmallows to build an acid and a base, a water molecule, and a hydronium ion. Do you know how hydronium is formed? Can you write the basic formula for the dissociation of nitric acid (HNO3)? Can you write the basic formula for the dissociation of potassium hydroxide (KOH)?
NO SCHOOL – 10 to 15 cm of snow.
Students begin work on Acid Base activity that focuses on dissociation (Smartboard notes 2-17-11). What does the equation below show? Any idea what acid is shown in the image? White = hydrogen, red = oxygen, and grey = carbon. Can you name it?
Students wrapped up the pH lab by answering the STOP and THINK question (p.229) in their lab notebooks. All students took the PSSA Practice Quiz #2 as preparation for the PSSAs in April.
Lab today to determine the actual pH of some common household substances. Smartboard Notes 2-15-11. How did your results compare with this chart?
Students wrapped up the two activities to start Chapter 5 on the ranking of acids and bases and metals (reactivity). Lab notebooks were returned with comments. Tomorrow we will conduct a lab activity to test common household solutions for their pH. Students have until Thursday 2-17-11 to take care of missing work from the 2nd marking period. After this date all incomplete grades WILL be changed to a 35%.
Students assigned common household solutions to three categories – acids, bases, and neutral solutions. Lab notebooks were turned in with the lab activity completed up to and including the “Stop and Think” questions on p.224. Acid and Base song!
