On Target? Do this on your Warm Up worksheet! Solubility is explained by “Like dissolves like.” Explain what this means and give an example.

For today 1.Warmup 2.Finals and Grades 3.Solubility 4.Big ideas! Objective: I can explain how charges influence the properties of our substances with both words and pictures.

Semester Grades There was a problem in Skyward, so the grades on your report card are different than what your grades actually are on your transcripts! They have been fixed, and should be correct on your transcripts now Most changes should be a positive one, meaning your grade should go up! Some had a large difference, and others were a smaller difference-depending on how well you did on the final If you want to see what your grade is, come see me at the end of class OR see Ms. Benson/Ms. Klopfer in the attendance office and they can print off a transcript for you

Final! Presentation, model and group grades are all out of 100 points each Presentation grades were calculated to be made up of ¾ of your actual presentation and ¼ check-in and turning in on time with Ms. G Presentation and model grades multiplied in Skyward to be out of 450 points each Total with all 3 grades together in skyward was 1000 points The guest judges gave comments, but their imput did not affect your grade. My rubric has your grade in it, and I graded in red ink. Model grades are on the back! Models and user guides are ready to be picked up! If you don’t see yours, it’s in the library on display or I am keeping it for future examples (if you want it back, talk to me!)

Why do some substances dissolve in water while others don’t? Make a sketch of your idea in the corner of your whiteboard Then (once everyone has an idea) make a sketch in the middle of what the group agrees on

Why do some substances dissolve in water while others don’t? When salt dissolves in water, does completely disappear? – It looks like it does! – Have you ever drank salt water? Does it completely disappear? So if it doesn’t disappear, what happens? It dissolves and gets very tiny! Meaning it had to get pulled apart in some way What do you know about charges and attraction that helps you to explain how water pulls apart salt into tiny pieces?

Why do some substances dissolve in water while others don’t? What does salt have to have in order to dissolve in water? CHARGES! What doesn’t dissolve in water? OIL! So what do we know about oil, based on this information? Oil doesn’t have charges!

Solubility-TAKE NOTES! “Like dissolves like” Water will dissolve other things with charges! So if you mix 2 things without charges, are they soluble with each other? – YES!

Solubility “Like dissolves like” – Solvation process

Make a sketch in your lab notebook! How does salt dissolve in water? HINT: What is the formula for salt? What ions does it have? Na + Cl -

Review: Solubility “Like dissolves like” – Solvation process

Why would salt conduct electricity in water but NOT as a solid? Diamond white boarding! Think about: 1.What might be different about salt as a solid crystal vs in a liquid? 2.What is salt able to do in water? 3.It can move around in water!

How can one substance dissolve in water and NOT conduct electricity while another dissolves and DOES conduct electricity? Think about: 1.How does the conductivity meter work? Does it have charge? 2.How might particles be charged differently? 3.What needs to happen for electricity to be conducted? 4.Why would deionized water not conduct electricity?

How salt dissolves

How sugar dissolves

Big Ideas! In your notebook, fill in the following sentences: 1.Charges are important because__________. 2.Water is attracted to both positive and negative objects because______________. 3.Water can dissolve objects with charges by____________. 4.Salt can conduct electricity in water because_________. Sugar cannot conduct electricity in water because__________.

Partner Read p What does it mean when something is an electrical conductor? Partner A Partner B Reads paragraph Listens, asks questions Both write down bolded words and agree on their meanings. SWITCH ROLES WITH EACH PARAGRAPH.

ON YOUR OWN Write a summary (with an example) explaining... What does it mean when something is an electrical conductor? – Why would some of our solutions conduct electricity and others not? TURN INTO BASKET

SUMMARY In a conductor, charged particles called ions (+ or – charge) are moving in an electrical current. For example, salt water must have ions moving between the prongs conducting electricity and so completing the circuit, lighting the LED lights. Sugar in water is a insulator because ions do not move so no electricity is conducted.

Notes: If it is blue write it (or draw the diagram if the blue is to sketch). Title: WHY SOLUTIONS CONDUCT ELECTRICITY

Now think small…. Sketch this picture in your notebook. See if you can label any of the parts.

EXPLORE: Particular Properties electron proton neutron negative(-) positive(+) neutral Particle (Atom)

Do you think electricity is conducted the same through a solution? What might be different about the atoms in metals vs. solutions? Ions-atoms with a positive or negative charge Electrolytes-substances that produce ions in water Example) Table salt (NaCl)

Summary questions What is the charge on unbonded atoms? The charge on unbonded atoms is _______ Why does chlorine have a negative charge when ionically bonded to sodium? Chlorine has a negative charge when ionically bonded to sodium because ______________________ WHY DOES SALT NOT CONDUCT ELECTRICITY AS A SOLID BUT DOES IN SOLUTION?

IONS CAN MOVE!! How is that related to conducting electricity?

To think about … How big is the nucleus of an atom compared to the whole atom? Why don’t atoms pass through one another? Why are you hovering cm above your chair right now? WHY IS THIS IMPORTANT?

Attraction and repulsion: One of the probes on conductivity meter is positive while other is negative Opposite charges attract! Ions move in solution toward the opposite charged probe (in salt water, Na+ moves toward –probe; Cl- moves toward +probe) This movement conducts electricity!

Diagrams on pg Copy the picture of the conductivity meter in the solution on page 112. What solution do you think this is? What are the + ions and – ions? 2.Label all the parts of the system. 3.Explain why the light is on in this picture. 4.Which figure on pg. 113 is water and which is baby oil? Use evidence to explain your answer.