7.U01.L19.L20.Solubility

Solubility

SWBAT apply concepts that have been taught in previous lessons.

SWBAT identify the connection between solubility and temperature by graphing the solubility of sugar cubes in water.

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Multiple Choice

What is Solubility?

• If something dissolves in water

• If something floats in water

• If something sinks in water

• None of the above.

Multiple Choice

What does dissolve mean?

• The particles spread out and become part of the water.

• It floats on top of the water.

• It sinks to the bottom of the water.

• None of the above.

Multiple Choice

When something dissolves in water then it has Solubility.

• True

• False

Multiple Choice

When something dissolves in water it disappears and is no longer there.

• True

• False

What is Solubility Review

• Solubility: the maximum amount of solute that will dissolve in a certain amount of solvent at a given temperature.

• Solute = substance dissolved

• Solvent = does the dissolving

• Example: ____ grams of sald (NaCl) dissolved in 100g of water at ____^oC

Temperature and Solubility

• Temperature affects how much of the solute can be dissolved by the solvent.

• Solubility curves: Are used to show how the solubility of a substance changes with temperature.

How to read Solubility Curves:

• Find the line for the substance

• The amount that dissolves at a given temperature is on the y-axis.

How much KNO₃ dissolves in 100g H₂O at 50^oC. 

• Find the line for KNO₃ (red)

• Find the temperature and follow up to the line for KNO₃ (green)

• Read across to the y-axis and this is the answer (blue)

• About 87g of KNO₃ will dissolve.

Multiple Choice

How many grams of ammonium Chloride (NH₄Cl) will dissolve at 60^oC in 100g of water?

Directions: click on the image to the left to enlarge it.

• 70 g

• 55 g

• 40 g

Multiple Choice

How many grams of KNO₃ can be dissolved at 30^oC in 100 grams of water.

Directions: click on the image to the left to enlarge it.

• 47 g

• 18 g

• 10g

Multiple Choice

How many grams of NaCl will dissolve at 50^oC in 100g of water.

Directions: click on the image to the left to enlarge it.

• 38 g

• 100 g

• 30 g

Multiple Choice

At what temperature would 60g of NH₄Cl completely dissolve?

Directions: click on the image to the left to enlarge it.

• 55^oC

• 70^oC

• 100^oC

Multiple Choice

AT 30^oC, which substance has the lowest solubility

Directions: click on the image to the left to enlarge it.

• KNO₃

• NaCl

• KBr

• Yb₂(SO₄)₃

Multiple Choice

AT which temperature do KBr and KNO₃ have the same solubility?

Directions: click on the image to the left to enlarge it.

• 60^oC

• 50^oC

• 55^oC

• Never

Multiple Choice

At 80^oC, KBr's solubility is:

Directions: click on the image to the left to enlarge it.

• 100 g

• 80 g

• 90 g

• 0 g

Multiple Choice

What is density?

• The amount of matter in a unit of volume.

• How old something is.

• How heavy something is.

Multiple Choice

How do you find density?

• Mass x Volume

• Volume/Mass

• Mass/Volume

Multiple Choice

Which statement is true about this picture?

Directions: click on the image to the left to enlarge it.

• The dish soap is more dense than the honey.

• The honey is less dense than the bolt.

• The cherry tomato is more dense than the milk

• The water is less dense than the lamp oil.

Multiple Choice

Which state of matter is the most dense?

Hint: In which state of matter are particles the closest together?

• Gas

• Liquid

• Solid

Multiple Choice

What is water displacement used to find?

Directions: click on the image to the left to enlarge it.

• Volume

• Density

• Mass

Multiple Choice

An object's mass is 12 g and its volume is 4 ml. What is the density?

• 4 g/ml

• 3 g/ml

• 16 g/ml

• 6 g/ml

Multiple Choice

An object should float in a liquid if...

• Its denser than the liquid.

• It's less dense than the liquid.

• It's the same density as the liquid.

Multiple Choice

True or False: the pasta is more dense than the popsicle stick.

Directions: click on the image to the left to enlarge it.

• True

• False

Multiple Choice

Which of the following statements is false?

Directions: click on the image to the left to enlarge it.

• The corn syrup is the most dense liquid.

• The oil is the most dense liquid.

• The pasta is more dense than the crayon.

• The popsicle stick is less dense than the paperclip.

Multiple Choice

What is volume?

• How heavy an object is.

• The space an object occupies.

• The amount of matter in an object.

Multiple Choice

What is buoyancy?

• The ability of an object to float on the water.

• The ability of an object to sink on the water.

Multiple Choice

When a solid reaches the temperatures of its ____, it can become a liquid.

• Melting point

• Boiling point

• freezing point

• density

Multiple Choice

The freezing and melting points of water are the same.

• True

• False

Multiple Choice

What is happening at the boiling point?

• Liquid to gas

• Solid to Liquid

• Gas to Liquid

• Liquid to Solid

Multiple Choice

When does condensation happen?

• Solid to Liquid

• Liquid to Gas

• Solid to Gas

• Gas to Liquid

Multiple Choice

When does evaporation happen?

• Gas to Liquid

• Solid to Liquid

• Liquid to Solid

• Liquid to Gas

Multiple Choice

What does this triple beam balance read?

• 342.1

• 342.2

• 342.3

Multiple Choice

What does this triple beam balance read?

• 557.3 g

• 557.2 g

• 557.4 g

• 557.1 g

Multiple Choice

What does this triple beam balance read?

• 200.6 g

• 201 g

• 201.6 g

Water Displacement

• In the following image, a scientist is attempting to identify the VOLUME of the rock using water displacement.

• What is the volume of the rock when the initial starting water level was 150mL and the ending water level was 156mL?

Multiple Choice

What is the volume of the rock when the initial starting water level was 150mL and the ending water level was 156mL?

• 150mL + 156mL = 306mL

  The rock has a volume of 306mL

• 156mL - 150mL = 6 mL

  The rock has a volume of 6mL

• 150mL - 156mL = -6mL

  The rock has a volume of -6mL

• 156mL is the volume of the rock.

Multiple Choice

The difference in volume in a graduated cylinder when an object is added is called...

• Displacement method

• Mass

• Density

• Weight

Multiple Choice

To find out what the volume of the object is, we use the formula:

• new Volume + old volume

• old volume x new volume

• new volume - old volume

• old volume = new volume

Multiple Choice

Let's practice! A graduated cylinder Lreads 50 mL. After we drop in the object, the new water level goes up to 60 mL. What is the volume of the blocks? (Hint: new volume - old volume)

• 8 m

• 60 mL

• 10 mL

• 5 mL

Multiple Choice

What is the volume of the two red spheres? (Hint: new volume - old volume)

• 4 mL

• 2 mL

• 6 mL

• 8 mL

Multiple Choice

What is the volume of the ring? (new volume - old volume)

• 64 mL

• 8 mL

• 68 mL

• 4 mL