eQuizShow

solubility

Temperature on Solubility

Question:

Increase temperature will always improve solubility____ T/F?


Answer:

False----the solubility of gas will decrease when the temperature is increased

 



Question:

Solubility is the maximum mass of a solid that will dissolve in a saturated solution(pg:77)_____T/F?


Answer:

False. This definition is not perfect, we need to consider the effect of temperature.

It should be Solute instead of solid--gas can be solute as well



Question:

When a solid crystallizes out of a saturated solution, we call this phenomenon______? And in this experiment we also call it____?


Answer:

Precipitation.       Recrystallization

 



Question:

If you dissolve 25.0 g of sugar in 150 cm g/100cm 3 what is the concentration in :

A: 0.167g/cm3

B: 1.67g/10cm3

C: 16.67g/100cm3

  


Answer:

C. Need to use the standard unit g/100cm3



Question:
Answer:

Lab experiment

Question:

all the solutions are mixtures_____T/F?


Answer:

True.



Question:

In the lab, when we increase temperature, _____ (the name of the chemical substance) dissolved completely, represented its solubility will be increased when temperature increase.


Answer:

Potassium nitrate



Question:

In the lab, after recrystallization at room temperature, what is the shape of crystal Potassium Nitrate?  What is the shape of Sodium Chloride crystal ?


Answer:

needle-shaped

Cubic-shaped



Question:

Show it on the board:

The solubility curves of different substances in water as a function of temperature?


Answer:

Pg:79



Question:
Answer:

Acid Rain

Question:

To calculate the concentration of the solution, we used qualitative method___ T/F?


Answer:

False. It should be Quantitative method.



Question:

What are the two gases that we learned from the class could cause the acid rain?


Answer:

nitrogen oxides and sulfur dioxide



Question:

 In the textbook, we learned one of the worst consequences that affect people's daily life, which could be caused by acid rain, what is that?


Answer:

Acid rain become a part of the water supply, dissolve heavy metals. Affect human body pH.



Question:

what can we do to reduce acid rain?


Answer:

Because nitrogen oxides are created in the process of burning coal and other fossil fuels, some power plants are changing the way they burn coal. A great way to reduce acid rain is to produce energy without using fossil fuels. Instead, people can use renewable energy sources, such as solar and wind power.



Question:
Answer:

Solubility

Question:

what is the universal solvent


Answer:

water



Question:

What way could you make something dissolve faster?


Answer:

heating it up, smaller sizes, stirring



Question:

Why choose carbon dioxide instead of Ammonia in lab experiment?

(even though Ammonia can show a much better result?)


Answer:

Ammonia is toxic



Question:

what is the assumption that we made in lab: solubility of carbon dioxide?


Answer:

The carbon dioxide in bottle will be completely dissolved in water
 



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