Chapter 2 Sections 1 Flashcards
All Periodic Elements are at
room tempature
Why does an element have a fixed composition?
Because it contains only one atom.
No Elements have
the same element as others and never contain 2+
Why are elements/compounds classified as pure substances?
They have a consistent and fixed chemical composition (uniform composition)
Pure Substance:
matter that always has the same composition
ex: salt, sugar
element
made up of only one atom and cannot be broken down into simpler substances
A substance can be classified as _ and _
elements and compounds
How do mixtures differ from pure substances?
Mixtures don´t have a fixed composition while pure substances do.
If element symbol has one symbol, it must be _
If the symbol has 2+ letters, the second symbol must be _
capital, lowercase
Compound (element/compound):
A substance made from 2 or more simpler substances and can be broken down into these simpler substances..must have a fixed composition.
Compound´s properties differ from these of the substances from which its made. T/F
True
The Properties of mixtures can vary because the composition is not fixed. T/F
True
How are elements of a compound compared to the element they make?
Compounds properties differ from these of the substances its made from. (they are different)
Sand is an example of a
heterogenous mixture
Solutions are an example of a
homogenous
Heterogeneous
parts of mixture are noticeably different from one another
Homogenous
substance is evenly distributed, difficult to distinguish particles from one another.
Solutions particles are the _
smallest (homo)
Suspensions particles are the _
largest (hetero)
colloids particles are the _
intermediate particles (hetero)
Main difference between solutions, suspensions, and colloids is based
on the size of the largest particle. which one is which is decided by size of largest particle
Size of particles in a mixture has an effect on the properties of a mixture. True or False
True
You _ filter suspensions, you _ filter solutions/colloids
can, can´t
3 examples of a colloid
Cheese, Whole Milk, Fog, dried paint
