1. You will Need: 1.Alien Juice Bar Due today 2.Pencil & Colored Pencils 3.Log #5, Update with graded paper points 4.One Sheet of lined paper– Set up for Cornell Notes

2. 1. Cumulative STAR Cards Test on Cards 1-100 Next Tuesday, April 26 th 2. Official STAR Science Test – Next Thursday, April 28th 3.Binder Check #4 – Due next Friday, April 29th

3. Class Notes Topic: ________________________ Name ________________________________________ Class ________________________________________ Period ________________________________________ Date _____________________________________ Notes: Acids and Bases 1. What is an ION? 2. Why is an atom “charged”? 3. What is pH? 1. A positively or negatively charged atom or molecule. 2. It has more or less electrons than protons. 3. pH stands for potential of Hydrogen Ions

4. 5. What types of substances do these Ions form? 5. More H+ particles in a solution make an ACID More OH- particles in a solution make a BASE 4. What types of Hydrogen Ions are there? 4. There are positive Hydrogen (H+) ions are Hydronium Ions and negative Hydrogen Ions (OH-) called Hydroxide Ions

5. 6. What is the pH scale? 6. The pH scale tells you the strength of the acid or base. It is a scale numbered 0-14. 7. What colors are associated with Acids and Bases? 7. Ion sensitive papers or probes turn “HOT”colors (Red, Orange & Yellow) for Acids and NEUTRAL – Green and “COOL” colors ( Dark Green, Blue, Purple) for Bases 0 = strongest acid 7 = neutral 14 = strongest base What is the color pattern for coding acids and bases? Rainbow

6. 8. How would you neutralize an acid or base? If the acid or base is not too strong: 1)Add lots of water 2)Add the opposite type of substance 9. How would you neutralize a strong acid or base? If you have a strong substance: 1)Base – dilute with a weaker base and then use HCl to neutralize 2)Acid – dilute with a weaker acid and then pour acid into water; cool w/ice

7. 8. Summary 20 points = 4-5 Sentences discussing pH….compare it to something you know….positive & negative #’s, Rainbow colors……neutralizing

8. 1.Alien Juice Bar– Due today if you haven’t turned it in yet. 2.Extra Credit – Due tomorrow