9.1: Solutes, Solvents, and Water
9.2: Concentration
and Solubility
and Solubility
9.3: Properties of
Solutions
Solutions
Lab 9A & 9B
Lab 9B & 9C
100
The biggest percentage of a solution is made up of this, which is often a liquid.
What is a solvent?
100
This kind of solution is one that has water as its solvent.
What is aqueous?
100
When a substance will not dissolve it is said to be ____________.
What is insoluble?
100
There are several ways to calculate concentration. List three of them.
What are (any 3) grams per liter, percent mass , mass fraction, molality, mg/L, mg/mL, molarity, etc?
100
In a case where a salt dissolves and the solution absorbs heat, is the heat written on the products side of the arrow or the reactants side? Explain.
What is the reactants side? We do this to indicate that energy is absorbed, which means that the temperature of the solution decreases.
200
A molecule with a charge separation is called this.
What is polar?
200
Water that is condensed after boiling to separate solute particles from the water is called _____.
What is distilled water?
200
The amount of solute that will dissolve in a particular solvent is called its ___________ (at a given temperature and pressure).
What is solubility?
200
Describe how you would make a concentrated solution of lemonade.
What is: Increase the amount of lemon juice (the solute) used in making the lemonade?
200
Calculate the number of grams of potassium iodide (KI) needed to make one liter of a 1.0 M solution.
What is the molar mass of KI is 165.998 g/mole?
300
A substance is said to be _________ when it completely separates and disperses into the solution.
What is dissolved?
300
A solution that has very little solute dissolved in it is said to be ______.
What is dilute?
300
This is the energy released or absorbed when a solute dissolves in a solution.
What is heat of solution?
300
This is the molar mass of CuCl2.
What is 63.55 + 2(35.45) = 134.45 g/mole?
300
This is the number of moles in 1.75 g of solid Zn.
What is
?
?400
This is the substance dissolved in the solvent.
What is the solute?
400
If a solution is called _________ then it has a large amount of dissolved solute.
What is concentrated?
400
This is a solute capable of conducting electricity when it is dissolved.
What is an electrolyte?
400
When a chemical change takes place in a solution the water molecules either absorb heat or emit heat to the chemical solute. Name and describe these two processes.
It is called exothermic when heat is given off and endothermic when heat is absorbed.
400
What is the molarity of a solution that contains 8.5 g of NaCl in 250 mL of water?
What is the molar mass of NaCl is 58.55 g/mole 8.5 grams of NaCl corresponds to 8.5 g / 58.55 moles = 0.145 mole ? And the molarity is 0.145 mole / 0.25 L = 0.58 M
500
This property describes when intermolecular forces pull a liquid surface into the smallest possible area.
What is surface tension?
500
When the concentration of a solution is measured as moles of solute divided by liters of solution the concentration unit is this.
What is molarity?
500
Draw a picture of a water molecule. Label the positive ends and the negative ends of the molecule.
What is
?
?500
Describe why styrofoam coffee cups are good to use when we are investigating chemical changes in solution.
What is "because they insulate the solution from the environment; the solution does not lose or gain heat from the environment?"
500
Describe what entropy means, and what it means to decrease and increase it.
Entropy is a measure of thermodynamic randomness in a substance.
Decreasing the entropy means that molecules move less randomly.
Increasing the entropy means that molecules move more randomly.