jun 11 unit test Flashcards
solid -> gas
sublimation
gas-> solid
deposition
define matter
everything
define pure substances
one type of particle
define mixtures
two or more particles that make up something
define elements
cannot be broken down into smaller substances
define compounds
different elements combined in fixed proportions
define homogenious
it looks like one thing. eg.) apple juice,
define heterogeneous
you can see different things. eg.) a bowl of fruit
name some physical properties
states of matter ( gaseous, solid and liquid)
color.
smell.
freezing point.
boiling point.
melting point.
Magnetism
name some chemical properties
flammability, toxicity, acidity, reactivity
define chemical change
A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed
define physical change
Physical change is a type of change where the physical properties of matter change
examples of physical change?
Crumpling a sheet of aluminum foil.
Melting an ice cube.
Casting silver in a mold.
Breaking a bottle.
what happens when you change the number of neutrons
An isotope is formed
what happens when you change the number of electrons
an ion is formed
what happens when you change the number of protons
the element changes
is the period the row or the column
row
is the group the row or the column
column
what are the properties of metals
-high melting and boiling point
-solid at room temp (mostly)
-shiny, malleable
-good at conducting
what are the properties of metalloids
middle of non-metals and metals
what are the properties of non-metals
- low melting and boiling point
- mostly gases and solids at room temp
- poor conductors
- dull and brittle
what do groups tell you
the number of valence electrons
what do periods tell you
the number of orbitals
