If you dissolve 25.0 g sugar in 150 cm 3 of water, what is the concentration in g/100 cm 3 ? Show Answer
Answer for 5 Points 17 g/100 cm 3 Back to Board
Show Answer Which solution is more concentrated, 2.5 g/cm 3 or 2.6 g/10 cm 3 ?
Answer for 5 Points 2.5 g/cm 3 = 25 g/10 cm 3. The first solution is more concentrated. Back to Board
Show Answer A student poured 60 g of sodium nitrate into 100 cm3 of water and observed that all of the solid dissolved. Which of the following can she conclude about the solubility of sodium nitrate in water? A.It is less than 60 g/100 cm 3. B.It is 60 g/100 cm 3. C.It is greater than 60 g/100 cm 3.
Answer for 10 Points C. It is greater than 60 g/100 cm 3. Back to Board
Which of the following steps will increase the concentration of a solution of salt and water? A.Allowing some of the water to evaporate B.Adding water to the solution C.Adding salt to the solution D.Pouring out some of the solution Show Answer
Answer for 10 Points A and C will increase the concentration, but only if the solution is not already concentrated. Back to Board
Each of four test tubes contains 10 cm 3 of water at 25 °C. The following masses of unknown solid are placed in the test tubes: 4 g in the first, 8 g in the second, 12 g in the third, and 16 g in the fourth. After the tubes are shaken, all of the solid has dissolved in the first two test tubes, but some undissolved solid remains in the other two tubes. What is the concentration of the solid in each of the first two tubes? Show Answer
Answer for 10 Points Concentration in the first tube: 40 g/100 cm 3 Concentration in the second tube: 80 g/100cm 3 Back to Board
The solubility of the orange solid that you dissolved in water in experiment 4.1 is shown below for various temperatures. What would you expect the solubility to be at 15 °C? Explain. Show Answer Temperature (°C)Solubility (g/100 cm 3 ) 10 20 30 6.6 12.2 18.0
Answer for 10 Points A good way to answer this is to make a graph using the 3 data points. The solubility at 15 °C is about 9.4 g/100cm 3 Back to Board
Show Answer The solubility of the orange solid that you dissolved in water in experiment 4.1 is shown below for various temperatures. What would you expect the solubility to be at 40 °C? Explain. Temperature (°C)Solubility (g/100 cm 3 ) 10 20 30 6.6 12.2 18.0
Answer for 10 Points A good way to answer this is to make a graph using the 3 data points. The solubility at 40 °C is about 23.8 g/100cm 3 Back to Board
Show Answer If you dissolve 25.0 g of sugar in 150 cm3 of water, what is the concentration in g/cm 3 ?
Answer for 15 Points 25.0/150 = 0.17 g/cm 3 Back to Board
There are two kinds of felt-tip (magic markers) pens. Some are labeled “permanent” and some are labeled “water color”. What does the label tell you about the solubility in water of the dye in the two inks? Show Answer
Answer for 15 Points The label suggests that the dye in the “permanent” ink is insoluble in water, unlike the dye in the “water color”. Back to Board
Show Answer A solid is placed in a container with water and stirred thoroughly. Some solid dissolves and some solid remains at the bottom of the container. Will adding more water and stirring cause more of the solid to dissolve?
Answer for 15 Points Yes, if more water is present, more solid can be dissolved Back to Board
If you dissolve 25.0 g of sugar in 150 cm3 of water, what is the concentration in g/10 cm 3 ? Show Answer
Answer for 15 Points 1.7 g/10 cm 3 Back to Board
A solid is placed in a container with water and stirred thoroughly. Some solid dissolves and some solid remains at the bottom of the container. Does adding more water increase the solubility of the solid? Show Answer
Answer for 15 Points No, the solubility of the solid in water is not affected, only the amount of the solid that can be dissolved. Back to Board
Show Answer At what temperature are the solubilities of potassium nitrate and sodium chloride equal?
Answer for 20 Points The solubilities are equal at 24 C, the point where the graphs for the two substances cross. Back to Board
Show Answer What mass of sodium chloride (in grams) can be dissolved in 100 cm 3 of water at 20 °C?
Answer for 20 Points 36 g at 20 °C Back to Board
Show Answer What mass of sodium chloride (in grams) can be dissolved in 100 cm 3 of water at 100 °C?
Answer for 20 Points 40 g at 100 °C Back to Board
Show Answer What temperature is required to dissolve 110 g of sodium nitrate in 100 cm 3 of water?
Show Answer A mass of 30 g of potassium nitrate is dissolved in 100cm 3 of water at 20 °C. The solution is heated to 100 °C. How many more grams of potassium nitrate must be added to saturate the solution?
Answer for 20 Points 242 g - 30 g =212 Back to Board
Show Answer A mass of 10 g of sodium nitrate is dissolved in 10 cm 3 of water 80 °C. As the solution is cooled, at what temperature will precipitate first appear?
Answer for 25 Points Ten grams of sodium nitrate dissolved in 10 cm 3 of water is equivalent to 100 g dissolved in 100 cm 3 of water. The figure shows that as the solution cools, it will be saturated at 37 °C, and a precipitate will begin to form. Back to Board
Show Answer What is the name given to a combination of a solvent and a solute that cannot be separated by filtration?
Show Answer From the table below it can correctly be concluded that which of the following substances may be the same? SolidLiquid ALiquid BLiquid C XSoluble insoluble Y Soluble
Answer for 25 Points None are the same Back to Board
What is another term for weak solutions? Show Answer
Answer for 25 Points Dilute solutions Back to Board
Jorge dissolves as much as he can of a certain solid in 10 cm 3 of water in a beaker. The solid has a solubility of 80g/100cm 3 of water. The solution is then allowed to evaporate until only 5cm 3 of liquid remains. If he then decants the solution and evaporates it to dryness how much of the solid will Jorge be able to retrieve? Show Answer
Answer for 25 Points 4 g 80/100 x 5 =4 Back to Board
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