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.
