Vocabulary
Matter that has a fixed composition, the same properties throughout every sample, and is composed of only one type of particle
pure substance
NaCl (table salt) or Gold (Au)
pure substance
How can you tell if a substance is pure by observation?
It has a uniform composition, consistent properties no matter the sample size, and cannot be separated physically.
Method using paper or strainer to separate solids from liquids
filtration
Claim for salt water (not dissolved). Classify (pure substance or mixture). What am I _______?
I am a homogeneous mixture.
A pure substance made of only one type of atom, cannot be broken down chemically.
element
Salad, trail mix, or sand and water
heterogeneous mixture
How can you tell a mixture is heterogeneous?
It can be separated physically.
Heating a liquid until it evaporates, leaving solids behind
evaporation
Evidence for salt water. I observed ___________.
I observed that it can be separated physically, and it is uniform in composition.
A pure substance made of two or more elements chemically combined in a fixed ratio.
compound
Smoothie
Homogenous
Why is a compound different from a mixture?
Compounds are chemically combined and cannot be separated physically; mixtures can.
You boil me out and I can stay in the cup. What am I?
I am salt.
Reasoning for salt water. What am I ______ and why ___________?
I am a homogeneous mixture because I am uniform in composition and can be separated physically.
Matter that contains two or more substances physically combined that keep their own properties.
mixture
Salt water or gatorade
homogeneous mixture
How is heterogenous different than homogenous?
Heterogenous is not evenly mixed and homogenous is evenly mixed.
Evidence that filtration worked on sand and water
Sand stays on filter, water passes through
I am pure water. What am I __________?
It is a pure substance (compound).
A mixture that looks uniform throughout.
homogeneous mixture
Water (H₂O) or carbon dioxide (CO₂)
compound
What evidence shows a solution has a solute and solvent? (salt water)
The mixture looks uniform, but the solute can be separated by physically.
Evidence that evaporation works on salt water.
Salt on pan.
I am a fruit salad. What am I_______?
I am Heterogenous.