Vocab
Everything that has mass and takes up space
Matter
A change that does not affect the chemical structure of a substance
Physical Change
True or False: Atoms are the smallest piece of matter
True
The atoms/molecules at the beginning of the reaction that react together
Reactants
This state of matter has the least amount of thermal energy
Solid
A substance made up entirely of one kind of atom
Element
A change that rearranges the chemical structure of a substance through a chemical reaction
Chemical Change
The positive particle found in the nucleus of an atom
Proton
The atoms/molecules produced by the reaction
Products
This state of matter has the most amount of thermal energy
Gas
The smallest piece of matter composed of three atomic particles: protons, neutrons, and electrons
Atom
The size, extent, or importance of something relative to something else
Scale
The negative particle found outside the nucleus of an atom on shells
Electrons
The process that rearranges the atoms of the original substance into a new substance
Chemical Reaction
How do you figure out the number of electrons in an element?
Same as the number of protons
# of electrons = # of protons
A chemical process that absorbs energy into the reaction from its environment
Endothermic
A combination of two or more atoms bonded together
Molecules
The neutral (no charge) particle found inside the nucleus of an atom
Neutron
The chemical energy stored in the bonds holding atoms and molecules together
Chemical Energy
Which law says: Matter is neither creater nor destroyed.
Conservation of Matter
A chemical process that releases energy from the reaction into the environment
Exothermic
The motion of atoms and molecules in a substance or object as its temperature increases
Thermal Energy
What does the atomic number of an element represent?
Atomic Number
True or False: Energy is required in chemical reactions
True
Write the equation to solve for the number of neutrons in an element.
Atomic Mass - Protons = Neutrons