Matter & Atoms
Anything that has mass and takes up space.
Matter
This value on an element tile equals the total number of protons.
Atomic-number
Matter with a fixed composition that cannot be separated physically.
Pure Substance
A mixture with visible, distinct parts that is unevenly mixed.
Heterogeneous
Dissolving salt, tearing paper, and melting ice are examples of a...
Physical Change
The basic building block of all matter in the universe.
Atom
An atom has an atomic number of 6 and a mass of 12. Total neutrons inside.
6
Pure matter made of only one single type of atom.
Element
A mixture that looks completely uniform and smooth throughout.
Homogeneous
Rusting iron, burning wood, and baking bread are examples of a...
Chemical Change
The central region of an atom that holds its mass.
Nucleus
An atom has an atomic number of 15 and a mass of 31. Total neutrons inside.
16
Pure matter made of two or more different elements chemically bonded together.
Compound
What type of substance would saltwater be considered.
Homogeneous mixture
The formation of a new gas, precipitate, or color change signals this process.
Chemical Change
The reason heat, light, and sound are not classified as matter.
No mass
An atom contains 20 protons and 24 neutrons. Its rounded mass number.
44
Two oxygen atoms bonded together (O2) form both a _________ and a __________.
Element and molecule (Molecular Element)
What type of substance would air being considered.
Homogeneous mixture
The process of water evaporating into water vapor is what kind of change.
Physical change
The name for protons, neutrons, and electrons (all smaller than an atom)
Subatomic particles
The units that are used to measure atomic mass of elements.
Atomic mass units (amu's)
The chemical formula for rust would be considered both a _________ and a ___________.
Compound and Molecule. (Molecular Compound)
The physical property that allows oil to float above water.
Density
What is the key characteristic that occurs in every chemical change.
A new substance is formed