Physical And Chemical Change

Front 1

Physical Property

Back 1

Way to physically describe matter
Ex: Color, texture, luster, density, hardness

Front 2

Physical Change

Back 2

Changes only the physical property of a substance, not it's identity.
Example: Cutting, melting, freezing, changing shape, evaporation

Front 3

Chemical Property

Back 3

Describes an object/substances' ability to change into something new.
Example: Flammability, Reactivity

Front 4

Chemical Change

Back 4

Occurs when one or more substances are changed into entirely NEW substances.
They have different properties from the original substance.
Some signs (or evidence) of chemical change:
a gas is produced, the temperature changes, a substance disappears, a solid is formed, a color change occurs, a new odor is produced.

Front 5

Mixture

Back 5

A combination of two or more substances that can be separated by Physical means.
Examples:
Peanuts + Raisins, Peanut Butter and Jelly, a salad, Kool-Aid and Water

Front 6

Compound

Back 6

A pure substance that is formed through a chemical change involving two or more elements, ingredients, or parts.
examples: Baking eggs, flour, sugar, milk, chocolate chips together to make chocolate chip cookies. Mom + Dad = You

Front 7

Solubility

Back 7

A measure of a substances ability to dissolve-a type of physical change.
Ways to increase solubility:
Heat it up, Stir it, Crush it

Front 8

Solvent

Back 8

Substance that is used to dissolve the solute in the solution.
Example: Using Soap to dissolve oil. Using water to dissolve sugar. The Soap and the water are the solvents.

Front 9

Solute

Back 9

The thing being dissolved in a solution.
Examples:
The oil being dissolved by soap. The dirt being dissolved by water.

Front 10

Homogeneous

Back 10

The same throughout. A mixture in which the substances are evenly mixed at the atomic level, but are not bonded together.
Examples:
Sugar and Water and a bunch of other stuff mixed together to make a SODA. All the ingredients from a cows body coming together to make MILK.

Front 11

Suspension

Back 11

A type of heterogeneous mixture in which the particles are large enough to "settle out". Like a snow globe or pepper put into water.

Front 12

Heterogeneous

Back 12

A mixture in which the substances are not evenly mixed.
Examples:
Salad dressing that has separated. Your sock drawer is probably and excellent example as well.

Front 13

Reactants

Back 13

The starting material in a chemical reaction. Found on the left side of a written reaction equation.
Example:
In a Mentos and diet Coke reaction the Mentos and the Diet Coke are the REACTANTS.

Front 14

Products

Back 14

The end result of a chemical reaction. Found on the right side of a written reaction equation. Products have different chemical properties than the reactants from which they are formed.
EXAMPLE:
In a Mentos and Diet Coke reaction, the released CO2 gas in the form of a volcano is the PRODUCT.

Front 15

Melting

Back 15

A Endothermic phase change. The phase change from a solid into a liquid.

Front 16

Freezing

Back 16

A Exothermic phase change. The phase change from liquid to solid.

Front 17

Vaporization

Back 17

An Endothermic Phase change. The phase change from liquid to gas.

Front 18

Condensation

Back 18

An Exothermic Phase change. The phase change from gas to liquid.

Front 19

Sublimation

Back 19

A Endothermic Phase change in which a solid turns directly to gas. Dry ice and snow do this all the time.

Front 20

Endothermic

Back 20

A change in which energy is entering the system. Because energy is entering the system, the outside environment becomes colder.
Examples:
Changing from a solid to a liquid to a gas.
Think about ice melting in a cooler. As the ice melts it turns from a solid to a liquid to a gas. But as the ice melts, it's pulling in heat energy from it's outside environment, making the surrounding environment colder.

Front 21

Exothermic

Back 21

A change in which energy is exiting the system. Because energy is exiting the system, the outside environment becomes warmer.
Example:
Going from Gas to Liquid to Solid. Think about the action of your refrigerator. In order to keep food cold and make ice in the freezer, it needs to get rid of energy into the outside environment. As the refrigerator and freezer run, your refrigerator expels (get's rid of) heat through the use of fans, making the area around your fridge warm.