Before class on Monday, Sept. 19:
- Watch the following three videos (13 min, 13 min, 4 min). (The first two videos are posted. I will post the last one around 4 or 5 pm today.)
- Complete the notes. The notes for the first video I handed out in class. The notes for the second two are here: notes-lesson-2-unit-2-precipitation-reactions
- Comment/write a question/answer a question on the videos in the comment section below.
- Also, you should have a rough draft of your data and calculations from the lab that you can show to some of your classmates to get feedback.
chemistry matters 
In these videos I learned about polar substances and how they attract and hold on to ions (through a dipole-dipole force) when dissolved in water. A precipitate is a solid that is formed as a result of the reaction of 2 solutions. I learned about how I can guess if a substance will be soluble or insoluble based on the work of other chemists, and how to use that information to write metathesis/molecular/double replacement reactions when given 2 solutions. Building on that I also what a spectator ion is and how to write a complete ionic reaction and a net ionic reaction. I also learned about electrolytes.
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If you are not part of the solution, you are part of the precipitate
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When you were writing the complete ionic equation, why did you write the subscripts as the coefficients? Would it be alright to leave it as subscripts?
I learned that the Dipole-Dipole force is one of the main reasons why things dissolve. I learned about how precipitates form and how to use solubility rules as well as how to write molecular, complete ionic, and net ionic equations.
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Your question is a good one. You must change the subscripts to coefficients, depending on how the ionic substance breaks up when it dissolves. Let’s talk about this with the whole class tomorrow–it is a good question.
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What happens if both the aqueous substances in the reaction turns into a precipitate?
A complete ionic equation is an equation with also the spectator ions included in the equation. A net ionic equation is an equation in which the spectator ions are left out.
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nice
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I learned that a precipitate is a solid that forms from 2 solutions reacting together and how to figure out if a precipitate will form when we mix two solutions together. I also learned about complete ionic equations and how to find the net ionic equations.
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I learned that a complete ionic equation includes all of the aqueous and solid ions written out and balanced. The net ionic equation only includes what has reacted.
When polar substances dissolve each other, since they are unbalanced in charge, would they then become non polar?
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In the following videos, I learned how precipitates are formed in a reaction and how to find out if ionic compounds are soluble or insoluble in water
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A precipitate is a solid that forms as a result of 2 solutions. Something that is key to remember is that soluble compounds are anything with group one metals or NH4. I also learned about complete ionic equations, spectator ions, and net ionic equations. Spectator ions do not react.
Can someone explain dipole-dipole forces? I’m a bit confused about it.
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In this video, we learn that salvation is the process of dissolving water. On the other hand, precipitate is when something new occurs during a reaction. Solid is insoluble and aqeuos is soluble. We learn to determine whether the substance is soluble or insoluble using the rules.
Question:
What if the precipitate is homogenous?
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From this video we learned about general properties of aqueous solution and precipitate. We also learned how to figure out if its soluble or insoluble compounds.
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In these videos I learned what a precipitate is and also about electrolytes. I learned about polar and nonpolar molecules and about the dipole-dipole bonds. I alswo learned about net ionic equations and how to find them and I learned about the exceptions to solube/insoluble ionic compounds.
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In lesson 2.1 and 2.2, I learn about polar(unbalanced in charge) vs nonpolar (balanced in charge), electrolyte (solution that conducts electricity) vs nonelectrolyte (solution that does not conduct electricity). If precipitate forms when two solution are mixed together, then reaction occurs.
Question: how do we know if something is polar/nonpolar? Do we have to draw out molecules to see if the electrons are share equally or is the another way to find out?
Does a compound have to include all elements of C, H, and O to be consider an organic substance?
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Sometime you can tell if something is nonpolar by the formula, but usually you must know the shape. We will work on this in November. A substance must have carbon to be organic–the oxygen does have to be there.
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In these videos, we focused a lot on aqueous solutions. We learned that the precipitate is the substance in the reaction that is solid/insoluble. We also learned how to write a net ionic equation and about spectator ions. We also learned how to use our solubility chart and information regarding elecrolytes/nonelectrolytes.
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