Test 4 Flashcards
Which is soluble in water?
- Sugar 2. Sodium Chloride 3. Sulfur
- Copper Sulfate 5. Zinc Oxide 6. Sand
- Kool Aid Powder
Sodium Chloride, Copper Sulfate, Sugar, Kool Aid Powder
What is solubility?
Is the amount of solute that a solvent in a given volume
What is solubility affected by?
Temperature, pressure, and changing the amount of the solvent.
How does changing the amount of solvent affect the amount of solute that will dissolve?
If you increase or decrease the amount of solvent you use, you will decrease or increase the solubility.
How do you determine the solubility of a substance in the lab?
Take the mass of the substance you are using. Next take a scoop some of the solute into the solvent and stir. Once the mixture has become saturated take the mass of the container the solute was in. Next subtract the ending and starting mass. Then take that answer and compare it to other substances. Which ever is closer than that is your substance.
Difference between homogenous and heterogeneous
Homogenous is a well-mixed solution
Heterogeneous is a non-well-mixed solution.
What are the parts of a solution?
Solutions are homogenous mixtures made out of at least one solute and solvent.
How do you know when a solution has become saturated?
When the solvent can no longer dissolve the solute.
How can knowing the solubility of a substance help identify one?
Solubility is characteristic substance. We can use solubility the find out which substance it is using the periodic table
When is it appropriate to use the filtration technique to separate a mixture?
When it is a heterogeneous mixture.
When should you use evaporation to separate a mixture?
When the mixture is homogenous
Explain the difference between residue and filtrate
The residue is the substance that is left in the filter. The filtrate is the substance that falls into the test tube or beaker.
What is Desalination?
The process of removing salt from seawater.
What is a Characteristic Property?
A characteristic property is an identifying trait of a substance that helps to identify what a substance is
What are examples of characteristic properties?
Density, solubility, melting, and boiling point.
Describe an alloy
Alloys are mixtures of solids/metals
Why are they useful? (ALLOY)
The are useful because they change the properties of substances they are made from and allow us to create new materials with properties or characteristics that are useful.
What happens o the freezing point of water when salt is added?
The freezing point decreases/lowers so tat it is harder for the water to freeze again.
Why is salt added to the roads in winter?
They add salt to the road because salt can lower the freezing point of water so the roads won’t freeze as easily
What happens to the boiling point of water when salt is added.
Salt increases the boiling point of water making it harder for the water to boil.
Soluble
Able to dissolve
Insoluble
Unable to dissolve
Mixture
A substance made by mixing other substances together
Homogenous
Well-mixed
