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Warm Up 4/2 We know that our bodies need water, but how is the water used? Make a list of what that your body uses water for. Intro to Solutions. Solution – Homogenous mixture of 2 or more substances Solvent – Substance that does the dissolving (there is more of this one) - PowerPoint PPT Presentation
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Solution – Homogenous mixture of 2 or more substancesSolvent – Substance that does the dissolving (there is more of this one)Solute – Substance that is dissolved
What solutes could be dissolved into this solvent?
Can these two solids dissolve into each other?
What is the solvent and what are the solutes?
Can a liquid be dissolved in a gas?
How do you know if something will dissolve
in something else?
Like Dissolves Like!• Polar dissolves in polar • Nonpolar dissolves in nonpolar• Nonpolar does not dissolve in polar
http://www.kentchemistry.com/links/bonding/LikeDissolveslike.htm
(polar means the molecule has a + & – end)
What Can Speed up the Solution Rate?
1. Agitation (stirring) – causes the molecules to collide more.
2. Greater surface area (crushing or grinding) – more solute for the solvent to act on.
3. Temperature – Kinetic energy (movement) causes molecules to collide more.
Water – Universal Solvent
You know that your body needs water,
but why?
Warm Up 4/15
But what makes water so special? Why isn’t a different liquid compound used in its place?
Why so Special?1.High Heat Capacity – prevents sudden
changes in body temp.2.Reactivity – it is a reactant in many of
the chemical reactions in our body (food digestion)
3.Solvent Properties – most reactions in the body don’t happen unless the reactions are dissolved in water.
When you’re ridin’ in a Chevy and you feel something heavy…
Electronegativity! O is more
electronegative than H, so the O atom gets the shared
electrons most of the time.
+
-
The water molecules pull the salt ions away.
http://www.kentchemistry.com/links/bonding/LikeDissolveslike.htm
Called Dissociation.
Hydrogen BondsThe polar ends of the water molecules attract the opposite ends of other water molecules.
Hydrogen Bond Activity
Question: How many drops of water do you think the surface of a penny can hold? Make a prediction on your paper.
Procedure: Use a pipette to drop water onto a penny to find out. Try to use a level surface.
Left Side – On Your Own
Create your own left side for this lesson that demonstrates that you understand the ideas we learned in your own creative way.