Substances
substances can be classified into these two categories
What are elements and compounds
this is a mixture when all parts are uniformly mixed
what is homogeneous?
This is a homogeneous mixture
what is a solution
this is a material's ability to allow heat to flow
what is conductivity
this is the temperature at which a solid changes to a liquid
what is melting point
this is a substance that cannot be broken down into simpler substances
what is an element?
This is the type of mixture where the parts are noticeably different form one another, and are unequal in their distribution.
What is a heterogeneous mixture?
Milk is considered this type of mixture
what is a colloid?
This is the ability of a solid to be hammered without shattering
what is malleability
this is the temperature at which a substance begins to boil
what is its boiling point
This is the smallest particle of an element
what is an atom?
A mixture can be separated by this "means"
What is physically?
This is a heterogeneous mixture that separates into layers over time
What is suspension
this is the tendency of a liquid to keep from flowing
what is viscosity?
A physical property is used to identify this
what is material
This is a substance made from two or more simpler substances
What is a compound?
Name FOUR examples of mixtures
Chex mix, trail mix, salads, pizza, sandwiches
This is a heterogeneous mixture whose particles vary in size, but do not separate into layers
What is a colloid?
this is used to test the purity of a substance
what is density
a physical property is used to choose this
what is materials
Name FIVE elements from the periodic table of elements
Iron, Carbon, Oxygen, Nitrogen, Sulfur, Nickel, Gold, Silver, Neon, Hydrogen, Lithium, Helium, Bismuth, Mercury, Platinum
solution, suspension, colloids
Describe how Salt Water can be all three types of mixtures
solution: a tiny bit is mixed in, so the water tastes salty
colloid: more salt is added, just enough to leave a bit at the bottom, but if you stir it keeps getting mixed in more.
suspension: too much salt is mixed into the water, it cannot fully dissolve, leaving a layer
this is 0 degrees Celsius or 32 degrees Fahrenheit
What is melting point?
This is seen when you scratch two materials against each other to see which one will scratch
what is hardness