Chemistry Test 3/31

chemical reaction

INTRAmolecular molecule or IONIC structure, broken down- atoms rearranged, new substance

Starting substances

Reactants

When reactants experience a chemical change so they are converted to

Products

Physical change

INTERmolecular forces are changed, STATE OF MATTER CHANGE, not a new substance. (melting, boiling-same H20- and NOT a new thing like H2O2)

Indicators that show a chemical reaction has occurred

ECGP

Change in ENERGY (As in heat or light)

Change in COLOR

Production of GAS
Formation of PRECIPITATE

What is a precipitate?

Liquid + liquid= solid. A solid product of an aqueous reaction———- occurs when a concentration of a solute exceeds the solubility limit- and forms a solid with the solid particles

Chemical reactions occur when the intramolecular forces of reactants break apart and cause

Products

Chemical reactions in word form are called

Word equation

A chemical equation is very

SPECIFIC— in the way of using chemical formulas

Chemical equations show the number of moles of

reactants and products

Symbols for the state of matter

s, l, g, aq

The number of moles for the reactants + products are represented by

COEFFICENTS

Can you change subscripts?

NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

The reactants and products have to be the same because

So the NUMBERS and TYPE OF ATOMS are the same

Synthesis reaction

A+B=AB

Decomposition reaction

AB= A+B

Single replacement reaction

AB+C= AC

Double replacement reaction

AB+CD=AD+CB

Combustion reaction

C(however many subscripts)H(however many subscripts) + O2 = CO2+H2O

What is the product of combustion always

CO2+H2O

The single replacement occurs in three ways, what are they

Metal replacing hydrogen Ion

Metal replaces metal

Nonmetal replaces nonmetal

THESE ONLY OCCUR WHEN THE ELEMENT IS MORE REACTIVE THAN THE ONE ITS REPLACING

How is reactivity rate found

On a reactivity chart

Double replacement (DEF)

When IONS in the 2 compounds EXCHANGE places in an AQUEOUS situation

What state of matter does double replacement reaction have to be in always

AQUEOUS STATE- (particles typically dissolved in water, freely move and exchange places)

PRECIPIATES are commonly with DRR too

Combustion reaction (DEF)

with typically a HYDROCARBON, combines with oxygen and releases a large amount of energy in form of light and heat

(goes back to ECGP, with energy in form of heat and light)

Hydrocarbon

Hydrogen and carbon!