Conversation of Mass
chemical formula
indicates the relative number of atoms of each kind in a chemical compound
chemical equation
a way to describe a chemical reaction using chemical formulas and other symbols
Element
A pure substance made of only one kind of atom
Heterogeneous Mixture
A mixture in which different materials can be distinguished easily
proton
A positively charged subatomic particle that is found in the nucleus of an atom
subscript
A number in a formula written lower and smaller than the symbol to indicate the number of atoms of an element in a molecule
reactant
A chemical substance that is present at the start of a chemical reaction
atom
basic unit of matter
Filtration
the process that separates a solid from the liquid in a heterogeneous mixture
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
product
the new substances that are formed in a chemical reaction; to the right of the yield sign
chemical reaction
A reaction that changes the original substances. A new substance is form. Cannot be reversed.
compound
A substance made up of atoms of two or more different elements joined by chemical bonds
Sifting
a process used to separate the parts of a mixture by particle size
electron
negatively charged subatomic particle; located in the space surrounding the nucleus
coefficient
the new substances that are formed in a chemical reaction; to the right of the yield sign
physical reaction
A reaction that occurs without changing the original substances. NO new substance is formed. It can be reversed sometimes
mixture
A combination of two or more substances that are not chemically combined
Chemical Property
a property of matter that describes a substance's ability to participate in chemical reactions
atomic number
The number of protons in the nucleus of an atom
Law of Conservation of Mass
mass cannot be created nor destroyed
should you have the same amount of atoms at the beginning and at the end of the reaction?
yes
Homogeneous Mixture
A mixture in which substances are evenly distributed throughout the mixture
Physical Property
a characteristic that can be observed or measured without changing the identity of the substance
atomic mass
Number of protons plus neutrons of an atom