Apologia Chemistry Module 11 Test Review

Explanation
The solvent (usually water) is the substance dissolving the solute. The solution is the solute and the solvent together. The percipitate is a substance that doesn't dissolve.

Explanation
Like dissolves like. It's easiest for ionic compounds to dissolve in ionic solvents.

Explanation
Think about sugar in tea

Explanation
If the solubility of a solute isn't affected by temperature, it means that the solute remains equally soluble at different temperatures. Liquids are generally more soluble than solids or gases because their particles are already in a dispersed state, making it easier for them to mix with the solvent. Therefore, if the solute is not affected by temperature, it is likely to be a liquid.

Explanation
The hot Dr. Pepper couldn't dissolve as much gas as the cold one. That's why it spewed when we shook then opened it.

Explanation
Exo means out. Therm means heat. Endothermic reactions become cold.

Explanation
NH3 is a covalent molecule so it doesn't break into ions. It's i is 1. NaCl's i is 2, and K2CO3's i is 3.

Explanation
Got grams? Want moles? Divide by the AMU.

Explanation
Make a proportion with the moles over the balancing numbers. Then solve for the moles of HCN.

Explanation
Remember that molarity is Moles/Liters so moles/Molarity = Liters

Explanation
To change liters to milliliters, multiply by one thousand. Here is the original question: How many ml of a 1.51 M solution of HCN would be required to make 50.0 grams of potassium cyanide? Know these steps from these questions!

Explanation
The correct answer is: To find molality, you need to know how many moles you have.,To find molality, you need to know the weight of the solvent.,Molality is used to find the boiling point elevation.,Molality is used to find the freezing point depression.,Molality is a concentration unit.

Molality is a concentration unit that is defined as the number of moles of solute per kilogram of solvent. Therefore, to find molality, you need to know how many moles of solute you have and the weight of the solvent. Molality is used to calculate the boiling point elevation and freezing point depression, which are colligative properties of a solution. Additionally, molality is a concentration unit that expresses the amount of solute in a given amount of solvent.

Explanation
grams/AMU gets moles. grams/1000 gets kg. Molality is moles/kg.

Explanation
This is the formula for boiling point elevation. The freezing point depression formula has a negative in front of the i.

Explanation
Delta T =( - 2) (1.86)((7.5 grams/58.5 moles)/0.1 kg of water))

i = 2 for NaCl because it breaks into 1 Na ion and 1 Cl ion.
Remember to change the 100 grams of water into Kg by dividing by 1000.

Explanation
Since water freezes at 0 degrees C, 0-4.76=-4.76.
Be careful! Delta T is not always the final temperature only when you're using water and calculating freezing point.