Chemical changes occur during chemical reactions.

________________________________________________________________________________________.

________ = substance used in the reaction ________ = substance made by the reaction

Lesson 3

What are Some Chemical Reactions?

Yttrium hydride (Y–H) cluster reacts with a rhodium–carbon monoxide (Rh–CO) complex to make a new organic–multimetallic species.

Start with ___________ Arrows in the middle – reads as “makes” Ends with ___________

Chemical Equations: Shows what’s happening during a chemical reaction

Magnesium - silvery metal, used in fireworks

At high temperatures it reacts with oxygen and burns

Creates bright, white glow

Magnesium + Oxygen → Magnesium Oxide (metal) (gas) (white powder)

Chemical Reaction Example

During a chemical reaction1. No matter __________________2. No matter can be destroyed…_______________Matter is always “_______________”!____________________= ____________________

Example = Making a cakeMass of ingredients = mass of finished cake (plus water vapor, carbon dioxide)

Law of Conservation of Mass

When atoms or molecules interact, it can result in three different kind of reactions.

1. Decomposition →

2. Combination + →

3. Replacement + →

Types of Chemical Reactions:

Compounds split apart to form smaller compounds and elements

Model = Truck is unhitched from trailer

Example = Electricity in water cause hydrogen and helium to break apart

Types of Chemical Reactions: Decomposition

Elements or compounds come together to make new compounds

Model = truck being connected to a trailer

Example = Iron and sulfide combine to make iron sulfide (see p. 56)

Types of Chemical Reactions:Combination Reaction

Two or more compounds split apart and switch places to make new compounds

Model = 2 trucks can switch trailers

Example = a burning candle Candles have carbon and hydrogen atoms Breaks apart to make new compound of

carbon dioxide and water

Types of Chemical Reactions:Replacement Reaction