Science chemical and physical change
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