Chemical Reactions and Equations

What is a physical Change?

A change which alters a substance without altering its composition

What is a Chemical Change?

any change that results in the formation of a new chemical substance

Signs of Chemical Chang include?

Color change, Gas Production, and Change of energy(heat, light), Formation of a precipitate

What is a precipitate?

a solid substance formed in a solution during a chemical reaction

What is matter?

Anything that has mass and takes up space

What is the Law of Conservation of Matter?

Matter cannot be created or destroyed only changed from one form to another

What does the chemical equation show?

The reactants being converted to products

What do the little letters at the bottom of a chemical equation indicate?

They indicate the state or the phase that each substance is in.

What does the balance part of the equation come from?

It comes from having the same number of atoms on each side of the arrow

Indicate what phase each little letter stands for?

S\= solid phase, L\= Liquid , G\= Gas , Aq\= aqueous

What does aqueous mean?

Dissolved in water

What is a coefficient?

A number in front of a chemical substance that represents that quantity needed for a reaction to occur

What is a synthesis reaction?

When you combine two or more reactants to form one product

What is a decomposition reaction?

When one reactant breaks apart into two or more products

What is a single replacement reaction?

A type of chemical reaction that occurs by the transfer of electrons so that a neutral substance displaces a like

What is a Double replacement reaction?

chemical reactions that occurs when the like ions of two ionic substances displace each other to form new substances

What is a combustion reaction?

Occurs when carbon and hydrogen compounds react with oxygen to produce carbon dioxide and water

What is acid rain?

rain that has pH below 5.6