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
Question:
Answer:
Question:
Answer:
Question:
Answer:
Question:
Answer:
Question:
Answer:
Question:
Answer: