Vocabulary
Two or more substances that are together in the same place but whose atoms are not chemically bonded
Mixture
This is the basic unit of ALL matter
Atoms
Pizza
(Mechanical) Mixture
Recycling Facilities use a magnetic drum to separate metals like tin cans and wire hangers from other materials.
Magnetism
The science term meaning "to mix completely"?
Dissolve
A characteristic of a pure substance that can be observed without changing it into another substance.
Physical Property
When you have more than 2 atoms bonded together, you make this
Molecule (element or compound)
Salt
Pure Substance
When you make a pot of coffee, you're using this method of separation to make sure there are no coffee grinds in your cup!
Filtration
True or false: mixing water and oil is a solution.
False. The oil is non-polar so it cannot mix with the water.
The part of a solution that is usually present in the largest amount and dissolves a solute.
Solvent
These two categories fall under matter
Pure substance + Mixture
Air
Mixture (Solution)
Using a strainer to look for gold in a river bed.
Sifting
Name two substances that are insoluble.
Oil, sand, rocks, paper, flour, etc.
Water is an example of this kind of matter.
Pure Substance or compound
Can you elaborate on the reason as to why an element or compound is a pure substance and dissolving salt and water is a mixture?
An element or compound is a pure substance because it cannot be broken down into a simpler substance. A mixture, like dissolving salt in water, can be separated by physical means (boiling the water.)
Aluminum Foil
Pure Substance
Why are we able to separate mixtures?
Mixtures are not chemically bonded together, they're just physically together.
When a solution is "full" and cannot dissolve any more solute, we say it is...?
Saturated
When mixing water and salt, salt is the _______
Solute
A scientist has two samples: one is a mixture and one is pure substance. What can the scientist do to determine which is the pure substance and which is the mixture?
The scientist can study the physical and chemical properties of each sample. For example: the scientist can boil each substance and note the outcome.
Tap Water
Mixture (Solution). It would be a pure substance if it was just water (H2O)
There's a mixture of sand, salt, and iron shavings. You have a magnet, water, and a filter. How can you use these tools to separate this mixture?
You can use the magnet to get the iron shavings. Then you can pour the salt and sand mixture into the water and dissolve the salt into the water. Finally, you can pour the mixture through the filter to separate the water and sand.
A juice company accidentally mixed too much sugar into the batch of lemonade. What can the company do to fix the solution without starting over?
The company can slowly dilute (add more water) to the batch until the sweetness is correct.