structure of matter

TRANSFORMATIONS OF MATTER

INDEX

1-PHYSICAL CHANGES 2-CHEMICAL CHANGES 3-CHEMICAL EQUATION 4-CHEMICAL REACTION 5-THE CONSERVATION OF MASS 6-HEAT IN CHEMICAL REACTIONS 7-SPEED OF CHEMICAL REACTIONS 8-SURFACE AREA 9-TEMPERATURE 10-EVERYDAY CHEMICAL REACTIONS

PHYSICAL CHANGES

Chemical changes

A chemical change occurs in nature when a substance undergoes a change in which its nature changes .

CHEMICAL CHANGES

WHEN YOUHEAT SOME SUGAR ,IT TURNS INTO CARAMEL .IF YOU CONTINUE HEATING IT ,IT BECOMES THICK, DARK AND AFTER A WHILE IT STARTS TO BURN AND GIVE OFF A GAS.

PRODUCTS

REACTANTS

A CHEMICAL REACTION OCCURS WHEN TWO OR MORE BONDED ATOMS OF REACTANTS BREAK APART AND FORM NEW BONDS IN PRODUCTS.

Describe a process

REACTANTS

PRODUCTS

BREAK BONDS AND FORM NEW BONDS

Step 2

Step 3

Step 1

LAW OF LAVOISIER

IN A CHEMICAL REACTION THE MASS OF THE REAGENTS IS THE SAME AS THE MASS OF PRODUCTS.

ENDOTHERMIC REACTIONS : THEY NEEDHEAT YO TAKE PLACE. EXOTHERMIC REACTIONS : THEY RELEASE ENERGY IN THE FORM OF HEAT

SPEED OF THE REACTION

Chemical reactions occur at different rates or speeds

Surface Area: the greater the contact surface area between reactants the faster the reaction will occur..

Temperature :The speed of a chemical reaction gets slower with a decrease in temperature and it goes up with an increase in temperature.

The speed depends on the nature of the reaction and the different factors as follows:SURFACE AREA TEMPERATURE

REDOX REACTIONS

OXIDATION IN APPLES

WHAT IS A BATTERY?