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WorksheetsChapter 18/19 Reveiw
Total questions: 13
Worksheet time: 7mins
In this phase diagram, what description best applies to the curve connecting points A and C?
Boiling point
Equilibrium between the solid and liquid state
Critical point
The equilibrium between the liquid and the gas phase.
What is the order of the bonds from weakest to strongest?
I. covalent bonds
II. London dispersion forces
III. hydrogen bonding
IV. dipole-dipole forces
II < III < IV < I
II < IV < III < I
IV < II < III < I
III < II < IV < I
There are several different gas laws. When do the gas laws LEAST apply to the changes of a substance?
When the temperature is above 273 K
at standard temperature and pressure
at temperatures near absolute zero
at high volumes
2.20 mol of CaCl2 are dissolved in 1.00 L of water. What is the new freezing point of water? (The original freezing point of water is 0 Celsius. The Kf of water is 1.86,
1 L of water = 1 kg of water).
-12.3
-4.1
4.1
-10
Rubber, glass, and peanut brittle are examples of amorphous solids, which means their molecules are arranged ___________
with no orderly structure
the same way as liquids
in a strict crystal pattern
in cube-like patterns
A 350 mL sample of gas is held at 1.0 atm of pressure and at a temperature of 25 Celsius. How many moles of the gas are in this sample? (PV = nRT, R = 0.0821 L*atm/mol*K)
0.44 mol
0.014 mol
2.6 mol
1.8 mol
This graph shows an acid changing the pH of a base to make it netural. Indicators are substances that change color at certain pH levels so that a chemist can see when the acid-base mixture has become equal. Not all indicators are the same. If this acid-base solution becomes neutral at a pH of 5, which of the indicators below should be used?
phenolphthalein, which changes color at around ph 9
methly red, which changes color at around ph 5
methly violet, which changes color at around ph 1
You can use any of them
Graham's law of diffusion states that gases with smaller molar mass can move faster and fill up an area more quickly than gases with larger molar masses. Which of these situations demonstrate an example of "diffusion"?
I. Air moves in and out of your lungs
II. A mixture of two gases leak out of a hole in a container
III. Two different gases are released at opposite sides of a room and begin to spread throughout.
All of this are examples of diffusion
II and III only
I and II only
III only
Rank the following solution in order of lowest pH (most acidic) to highest pH (most basic):
I. bleach
II. lemon juice
III. baking soda in water
IV. normal rain water.
II < IV< III <I
II< III < IV < I
IV < II < III < I
IV < III < II < I
Which of these systems has the lowest entropy?
A cup of liquid water and ice cubes
The air in a room at 25 Celsius
A pure crystal solid at the lowest possible temperature
Ice at 0 Celsius.
A chemist predicts that a mixture of two gases, Nitrogen and Hydrogen, will increase in pressure when they add heat to it according to the Gay-Lussac law. Their calculations predict a pressure increase of 2.0 atm after applying heat. However, when they do the reaction the pressure increase is significantly less than 2.0 atm. What is the most likely explanation for this?
The Gay-Lussac law only applies to noble gases
The Gay-Lussac law only applies to pure gases, not mixtures
Some of the molecules of gas were heavier isotopes.
Some of the nitrogen and hydrogen reacted and formed ammonia (NH3), and this new substance does not take up as much space in the container.
The acid-dissociation constant (Ka) of benzoic acid is 6.3*10^-5 . What is the pH of a 0.50 M benzoic acid solution?
3.77
5.31
2.25
2.00
What word best describes "entropy?"
order
heat
randomness
internal energy
