Introduction to Introduction to Chemical ReactionsChemical Reactions

DensityDensity the relationship between the mass of the substance and how much space it takes up (volume)

Formula: D=M/V

DisplacementDisplacementVolume is a measure of the amount of space an object takes up. When a cylinder is submerged in the water it pushes water out of the way. If you measure the amount the water level increases, you can find the volume of the water pushed out of the way.

Chemical Chemical Reactions are Reactions are EverywhereEverywhereCookingCooking RespirationRespiration

Chemical Chemical Reactions are Reactions are EverywhereEverywhereHair DyeHair Dye Auto FuelAuto Fuel

How do you know How do you know when a chemical when a chemical

reaction takes place?reaction takes place?Color ChangeColor Change Precipitate FormationPrecipitate Formation

How do you know when How do you know when a chemical reaction a chemical reaction

takes placetakes place??Gas FormationGas Formation OdorOdor

What do you need to What do you need to have a chemical have a chemical reaction occur?reaction occur?

PPlease lease EExcuse xcuse CCoughing oughing SSneezes neezes and and BBurpsurps

PPrecipitaterecipitateEEnergynergyCColor Changeolor ChangeSSmellmellBBubblesubbles

PrecipitatePrecipitate

A precipitate is an insoluble solid that emerges from a liquid solution

Example: Kidney Stones

EnergyEnergyEnergy is usually released during a chemical reaction. Endothermic- A reaction that requires energy during the reaction is known as an endothermic reaction. Energy is absorbed in the form of heat, so the substance feels cold.Example: Ice melting

Exothermic-A reaction that releases energy during the reaction is known as an exothermic reaction. Energy is often given off in the form of heat.Example: Nuclear Bomb

Color ChangeColor ChangeColor Change- Color Change-  in a chemical reaction, a color change is usually an indicator that a reaction is occurring.

Example: Changing hair colorMilk souring

Smell (odor)Smell (odor)When eggs and food spoil, they undergo a chemical change.  The change in odor is a clue to the chemical change.Example: Eggs rotting

Bubbles (gas Bubbles (gas formation)formation)

Example:Example:Magnesium reacting with acid to produce Magnesium reacting with acid to produce HydrogenHydrogen