Polarity of water
How many Hydrogen atoms does a single water molecule have?
2
water stuck to the windshield is an example of what?
adhesion
When two substances are mixed, the substance that is dissolved is called the:
solute
what causes water's high heat capacity?
what is an acid & base?
Acids donate proton
bases accept proton
In a covalent bond, what ends up happening to the electrons?
transfer of electrons
surface tension
How does salt dissolve in water? what are the type of forces involved?
IMF--> ion-dipole interaction
which phase of water is the most dense?
liquid
what is a buffer?
A weak acid or weak base that can resist the change in temperature
What is a "polar" molecule? give an example
A molecule has areas of positive and negative charge
How are cohesion and adhesion alike? how are they different?
alike: HB/IMF
diff:
How is dissolving salt in water different from sugar dissolved in water?
Salt--> ion-dipole interaction
sugar--> polar-polar interaction
which state of matter would have highest kinetic energy?
Gas
Hypochlorous acid dissociates in water to create hydronium ions and hypochlorite ions HOCl+H2O⇔H3O++OCl−. Suppose that additional hypochlorite ions are added to the solution. Which of the following correctly describes the resultant effect on the concentration of HOCl?
increases
what type of bond holds the hydrogen and oxygen atoms together in a water molecule?
polar covalent bond
Drops of dew on a leaf owe their spherical appearance to:
cohesion, adhesion, and surface tension
Why do you think a salt-water solution eventually becomes saturated?
the solution becomes super saturated -> all the water molecules are interacting with the salt forming hydration shell.
Why does water have high heat of vaporization and give an example when it's useful.
HB and perspiration cooling, evaporative cooling
Why can strong acids and/or strong bases not be buffers?
they dissociate completely
Why does alcohol evaporate faster than water?
The molecules are not as attracted to each other
Explain how you are able to squirt water across a room with a hose or water gun.
cohesion
A 0.5 L vinegar solution contains 25.2 g of acetic acid (mw: 60.052g/mole). What is the concentration of the acetic acid solution in units of molarity?
(25.2 g X (1 mole/60.052 g) ) / 0.5 L
If I have 1 gram of water at 40 degrees celsius and I need to increase the temperature to 42 degrees celsius. How much heat do I need to put in?
4.186 X 2 = 8.372 J
Explain how Carbonic acid (H2CO3) and bicarbonate (HCO3-) functions as a buffer in our blood.
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