Structures of Matter
The smallest unit of matter which has properties of a chemical element.
What is an atom?
A process that involves the rearrangement of atoms to form new substances.
What is a chemical reaction?
The subatomic particles (the parts of an atom.)
What are protons, neutrons, and electrons.
Matter can neither be _____________ nor ______________.
What is created, destroyed OR made, lost.
The ratio of mass per unit of volume (g/mL)
What is density?
A group of atoms held together by chemical bonds
What is a molecule?
These are the ingredients of a reaction; they are on the left side of the arrow.
What are reactants?
This tells the number of protons in an atom.
What is the atomic number?
When there are the same number of each type of atom on the reactant side as the product side the equation is __________
What is balanced?
A precipitate
What is a new solid forming (or another name for solid)
Has a definite volume but not a definite shape
What is a liquid?
The model of a chemical reaction using symbols and chemical formulas.
What is a chemical equation?
The charge of an electron.
What is negative.
The number placed below after a symbol in a chemical reaction.
What is a subscript?
This affects the melting or boiling point of substances at various altitudes
What is pressure?
When two or more different atoms are joined together
What is a compound?
List at least 3 indicators of a chemical change.
What are color change, gas is produced (bubbles), a precipitate (solid) is formed, odor change, or Release/absorption of energy (temperature change)
Atoms share or exchange these when they bond.
What are electrons?
The coefficient multiplied by the subscript
What is the total number of atoms?
The number of valence electrons most elements aim to have
What is 8?
A substance that cannot physically be broken down into smaller parts
What is a pure substance?
The result of energy when the temperature drops.
What is absorbed?
The inner part of an atom, composed of protons and neutrons.
What is the nucleus.
____Al + _____HCl ---> ___AlCl3 + ____H2
What is 2Al + 6HCl ---> 2AlCl3 + 3H2
A solid with particles arranged in a repeating 3-D pattern
What is a crystalline solid?