Fill in the blank
Substances and mixtures are two types of ________.
Matter
Mass and weight.
Mass - measure of the amount of matter in an object
Weight - Force exerted by gravity
This physical property describes the arrangement and movement of atoms in a substances.
State
A small particle that is the building block of matter.
Atom
___ Al + ___ O2 ---> ___ Al2O3
4 Al + 3 O2 ---> 2 Al2O3
An object's _______ is the amount of mass per certain unit of volume.
density
Homogeneous mixtures and heterogeneous mixtures.
Homogeneous mixtures combine uniformly and chemically
Heterogeneous mixtures do not combine uniformly and are physical combinations
This type of physical property depends on how much matter is present.
size-dependent
The center of an atom
Nucelus
__FeS + __O2 ---> __Fe2O3 + __SO2
4 7 2 4
The amount of substance in a certain volume is its __________.
Density
Substances and mixtures
Substances - contain one type of matter
Mixtures - Combinations of two or more types of matter
The amount of space something takes up.
Volume
The number of protons in an atom is called this -
Atomic number
__KOH + __H3PO4 --> __K3PO4 + __H2O
3 1 1 3
The number of ________ always differs in atoms of different elements.
Protons
Physical and chemical properties
Physical - observable characteristics that don't change a substances identity
Chemical - describe a substances ability to undergo chemical change
This physical property does not depend on how much matter is present.
Size-independent
This can very in composition
Mixture
__PCl5 + __H2O ---> __H3PO4 + __HCl
1 4 1 5
A change in ________ is a sign that a chemical change might have occurred.
Smell
Elements and compounds
Elements are types of matter that exist in their purest form
Compounds are combinations of elements that create different substances (Ex. NaCl - Table salt)
This is the ability of one substance to dissolve in another.
Solubility
What is matter?
Anything that has mass and takes up space
__CaCl2 + __Na3PO4 ---> __Ca3(PO4)2 + __NaCl
3 2 1 6