Chemical/Physical Changes 7th grade Salome

Five signs of a physical change

1. Changing states, 2. Changing the color 3. Changing the temperature 4. Changing the shape 5. Changing the texture

Five signs of a chemical change

1. Combustion/burning 2. Bubbling 3. Unexpected color change 4. Unexpected temperature change 5. Precipitates

bread rising

chemical

bubbles after mixing 2 unknown substances

chemical

eggs cooking

chemical

fireworks going off

chemical

food digesting

chemical

high body temperature

chemical

iron rusting

chemical

leaves changing color

chemical

milk souring

chemical

silver tarnishing

chemical

wood burning

chemical

boiling water

physical

chopping vegetables

physical

ice melting

physical

sugar dissolving

physical

tearing paper

physical

whipping eggs

physical

A ___________________________ _______________________ does not change the substance into anything new.

physical change

combustion

A chemical reaction between substances, usually including oxygen combined

physical change

Changes the form or appearance of a substance. Changing the state of matter, color, temperature, shape or texture

chemical reaction

Occurs when two or more molecules interact and molecules change into a new substance. Bonds between atoms are broken and created to form new molecules.

precipitate

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

chemical change

When two or more substances join to form new substances with new chemical substances with new chemical properties. Unexpected color change or temperature change, combustion/burning, precipitation or bubbles form

Chemical reaction or change

____________________________________occurs when two or more molecules interact forming new molecules

A chemical change occurs when two or more join to form new substances with new __________________________________.

chemical properties.