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WorksheetsWater and Solution part 1
Total questions: 20
Worksheet time: 20mins
Water is a ...........................
mixture
element
compound
The melting point of pure water is ................. ° C
-2
0
2
100
The boiling point of pure water is .............. ° C
100
102
0
-2
This process involved the release of high amount of heat energy from water and makes the water molecules to become closer to each other in fixed position.
Melting
Freezing
Boiling
Condensation
What is the ratio of hydrogen and oxygen in water molecule?
2:1
1:2
2:2
1:1
The melting becomes lower than 0 ° C in water if there is the presence of salt. What is the term for salt it refers to?
Impurities
Densities
Electrolysis
Saltiness
Diagram shows experiment to study the effect if stirring and without stirring salts to its rate of solubility in water. Both beaker contain 100 cm³ of water.
What is the manipulated variable?
Rate of solubility
Temperature
Volume if water
Stirring and not stirring process
Diagram shows the experiment to study effect of stirring and not stirring salt in water towards its solubility in water. In which beaker does salt dissolves quickly
A
B
Diagram above shows the solubity between fine and coarse salt.
Which salt dissolves faster?
Fine salt
Coarse salt
Higher temperature, higher rate of solubility
True
False
Mixture of water and sand is an example of
Colloids
Suspension
Salt dissolves in water is an example of
Solution
Suspension
Colloids
Write down 1 factor affect the rate of solubility
(a)
Mayonese and condenser milk are example of
Suspension
Solution
Colloid
Three 10 g samples of sugar are represented below.
Sample A dissolves in water more slowly than sample B.
Sample B dissolves more slowly than sample C.
Which of the following best explains why sample A dissolves more slowly than the other two?
It has the most volume.
It has the smallest surface area.
It has the largest number of sugar molecules.
It has the fewest bonds between sugar modules.
A technican prepared a solution by heating 100 mL of distilled water while adding KCl crystals until no more KCl would dissolve. She then capped the clear solution and set it aside on the lab counter. After several hours she noticed the solution had become cloudly and some solid had settled to the bottom of the flask. Which statement best describes what happened?
As the solution cooled, evaporation of water increased the KCl concentration beyond its solubility.
Water molecules, trapped with the KCl crystals, were released after heating.
At lower temperatures the solubility of KCl decreased and recrystallization occurred.
At increased temperatures the solubility of KCl increased and remained too high after cooling.
Students in Ms. Alvarez’s science class are investigating how temperature, in degrees Celsius (C), affects the solubility of a compound in 100 milliliters (mL) of water. Ms. Alvarez provides the students with a graph that shows the solubility of a certain compound, as shown below.
She then tell the students that she will demonstrate how many grams (g) of the compound will dissolve in 100 mL of water at 40 C. Based on the information in the graph, which of the following is the best prediction of how many grams of the compound will dissolve at 40 C?
40 g
65 g
85 g
100 g
