Homogeneus vs. Heterogeneus
have the same properties and compositions in all parts
Homogeneus systems
What are the two types of homogeneous systems?
Pure substances and solutions
What are the three types of solutions?
diluted solution
concentrate solution
saturated solution
Which can be separated using physical methods: solutions or pure substances?
Solutions
Which can have a variable composition? (Which one can have a composition that changes?)
mixture
Have different parts with different properties
Heterogeneus systems
How many components does a pure substance have?
One single element or compound
What is a solution called when it is a solvent + a small amount of solute?
Diluted solution
True or false: Pure Substances have a constant composition
TRUE
Which one has substances that are CHEMICALLY joined together?
compound
Which one is homogeneus and which one is Heterogenues?
Gold, blood, water, smoke, granite
Homogeneus: gold and water
Heterogenues: blood, smoke, granite
What are the two components of a solutions?
solute and solvent
What type of solution has a solvent and a large amount of solute?
Concentrate solution
What are the two types of pure substances?
Chemical compounds and elements
What happens to the properties of a substance in a mixture?
Each substance keeps its own property.
How do we separate heterogeneus mixtures that are made of a solid and a liquid?
Filtering
True or false: Solutions are always liquids.
FALSE. Solutions can be solids, liquids, or gasses.
How do we find the concentration of a solution? What is the formula?
(Amount of solute) / (amount of total solution)
True or false: Pure substances that make up a compound can be physically seperated.
FALSE. They can only be separated chemically
Can we easily separate compounds?
No. We can only separate compounds chemically
What is it called when we separate heterogeneous mixtures by their densities?
Decantation
If salt is mixed in with water, which is the solvent?
Water. There is more in it and it's state does not change
True or false: There is only one way to express concentration?
FALSE. There are many ways to express concentration depending on the unit used.
Ex: grams per liter, percentage in mass, percentage in volume, etc.
Where are all the elements written?
The Periodic Table
What is one example of a mixture and one example of a compound?
Mixtures: air, sea water, most rocks
Compound: water, carbon dioxide, magnesium oxide, sodium chloride