Chem definations Flashcards
Element
substance that cant be borken down
compond
substance that can be broken down
base
produce positively charged metal ions, and negatively charged hydroxide ions. when desolved in water
ion
charged atom that has lost or gained elections
atom
smallist unit
acid
Substances that produces hydrogen ions (H+ ) when dissolved in water.
coefficient
a number written in front of a chemical symbol or formula; indicates the number of atoms or molecules of that substance.
physical change
the composition stays the same
chemical changce
change in starting chemical + 1 or more new substances
ph scale
A scale to measure the relative acidity or basicity
valence shell
last energy shell
molecule
2 or more atoms chemically combined
ionic compound
metal + non metal
polyatomic ion
covalent bonded set of two or more atoms
molecular compund
non metal +non metal
matter
anything that has masxs and takes us space
cation
atom with a positive charge
anion
atom with negative charge
binary acids
hydrogen combines with a non-metal
oxyacid
hydrogen combines with polyatomic ions that contain oxygen.
indicator
A substance used to distinguish between acidic and basic solutions
Law of Conservation of Mass
The mass of the reactants in a chemical reaction must equal the mass of the products
