# Lesson Worksheet: Solubility: Stirring and Temperature Science

In this worksheet, we will practice describing the effects temperature and stirring have on the rate of dissolving in a solution.

Q1:

When a cube of sugar is dissolved into water, a sugar solution is made. Look at the diagram.

Fill in the blanks: The the temperature is, the the solute dissolves.

• Ahigher, faster
• Blower, faster
• Chigher, slower

Q2:

James has four beakers of water, each at a different temperature. He dissolves one spoonful of table salt in each beaker. Here is a diagram of how James set up each of his four beakers.

In which beaker will the salt dissolve the fastest?

• ABeaker 2
• BBeaker 1
• CBeaker 3
• DBeaker 4

Q3:

Noah wanted to investigate how quickly sugar will dissolve at different temperatures. He decided to use three different temperatures and time how long the sugar took to dissolve. Noah made sure his investigation was fair by keeping these things the same:

• the amount of sugar,
• the amount of water,
• the speed of stirring,
• the type of sugar.

Here is a table of his results.

 Temperature (∘C) Time of Dissolving (s) 30 35 40 45 ⋯ 5

Predict the time taken for the sugar to dissolve in water.

• A40 s
• B20 s
• C1 s
• D50 s

Q4:

Suppose a cube of sugar takes 45 seconds to dissolve in a beaker of water at .

Some students are discussing what will happen if they dissolve another sugar cube of the same size into water.

Who is correct?

• ALiam
• BMatthew
• COlivia

Q5:

Mason investigates how stirring affects the rate of dissolving. He makes his test fair by using the same amount of sugar and water each time. He also keeps the temperature of the water the same. Here is a table of his results.

Stirring Time of Dissolving (minutes) Yes No 0.5 7.0

Mason writes a conclusion based on his results.

Fill in the blank: Stirring the rate of dissolving.

• Bincreases
• Cdoes not change

Q6:

Jacob and Amelia both drop a sugar cube into their tea at the same time.

The temperature of their tea is exactly the same.

Jacob stirs his tea and Amelia does not.

Whose sugar cube will dissolve first?

• AAmelia’s
• BJacob’s
• CNeither Jacob’s nor Amelia’s, as both sugar cubes will take the same time to dissolve

Q7:

A class is investigating how stirring affects the rate of dissolving. Half the class stirs fast, and half the class stirs slowly. Here is a table of their results.

Time Taken to Dissolve (s)
Trial 1Trial 2Trial 3
Stirring Slowly60120110
Stirring Fast495146

An anomaly is a result that is not expected.

Which result is an anomaly?

Suggest a cause for the incorrect result.

• ANot stirring at all
• BStarting the timer too early
• CStirring too slowly
• DStirring too quickly

Q8:

Benjamin investigated the affect temperature has on how quickly sugar dissolves.

Look at the bar graph of his results.

Which temperature of water dissolved the sugar fastest?

Q9:

Pick the method that will make a solute dissolve quicker.

• ALess solvent
• BLarger lumps
• CLower temperature
• DStirring

Q10:

David was investigating how fast salt dissolves in water. He did three different tests with different conditions.

Test 1 Conditions Test 2 Conditions Test 3 Conditions
Cold water
No stirring
Hot water
Stirring
Hot water
No stirring

Put the tests in order of how fast the salt dissolved from fastest to slowest.