Science chemical and physical change

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What is chemical change

A change of appearance of a substance

What is physical change

A change of appearance of a substance

How does evidence of chemical reactions indicate that new substances with different properties are formed?

When you see changes in the substance. Like bubbles, temperature change, color change, etc.

Examples of physical change

Whipping eggs Boiling water Dissolving sugar Dicing vegetables

Precipitation forms when...

a solid suddenly appears in a solution and settles to the bottom, collects on another object, or makes the solution cloudy.

Combustion/burning

A chemical reaction between substances, usually including oxygen accompanied by giving off heat and/or light

Examples of unexpected temperature change

Adding baking soda to vinegar causes the temp. To DECREASE Body temperature increases to fight infections

Examples of bubble forms

Alka-Seltzer Bubbles are released when vinegar and baking soda are combined

Unexpected temperature change

During chemical bonding energy is released or absorbed making their surroundings hotter or cooler

Bubbles form when...

Gas from chemical reactions is released.

Examples of chemical change

Iron rusting Gas burning Eggs cooking Bread rising

Examples of forms of precipitations

Milk souring Bathtub rings

Unexpected color change

New molecules made in a chemical reaction radiate light differently producing new colors

What is a chemical reaction?

Occurs when two or more molecules interact and the molecules change into a new substance.

What is a chemical reaction?

When 2 or more substances join to form a new substance with new chemical properties

Examples of combustion/burning

Wood burning Candle Rusting

Forms of physical change

Changing the state of matter Color changing Temperature changing Changing shape Changing texture

Examples of unexpected color change

Fireworks Leaves changing in fall


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