Elements
This is a pure substance made of only one kind of atom.
Element
Give one example of a mixture. Homogenous or Heterogenous
Salad, saltwater, trail mix, sweet tea
Give 1 example of a compound
H2O
Nacl
CO2
The basic unit of matter.
Atoms
This is formed when two or more elements join together chemically.
compound
The chemical symbol for this element is O.
Oxygen
This type of mixture has the same composition throughout.
Homogenous Mixture
The chemical formula for water.
H2O
This part of the atom contains protons and neutrons.
Nucleus
How many atoms are in H2O
What elements make up a large part of the Earth?
Hydrogen and Oxygen (H2O)
This is a mixture where you can see the different parts, like salad.
Heterogenous Mixture
This compound is made from sodium and chlorine.
Na..... Cl
Sodium Chloride or Table Salt
These negatively charged particles orbit the nucleus.
Electrons
This molecule is made of one carbon atom and two oxygen atoms.
Carbon Dioxide
This element is needed for hemoglobin in blood and has the symbol Fe
Iron
This thing is physically combined
Mixture
The smallest unit of a compound that still has its properties.
Atom
The number of these in an atom determines its atomic number.
Protons
This molecule, made of two hydrogen atoms and one oxygen atom, is essential for life and covers most of Earth's surface
Water
This element's atoms have 79 protons
Gold
Saltwater is this type of mixture, because the salt is dissolved in water.
Homogenous Mixture
The smallest unit of a compound that still has its properties.
Atom
This is the total number of protons and neutrons in an atom's nucleus.
Atomic Mass Number
Difference between a physical change and chemical change
physical= you can "undo" it
chemical= you cannot "undo" it