3.2 - Changes in Matter There are two types of changes matter can undergo. PHYSICAL CHANGE CHEMICAL CHANGE What is it? What is it? no _____________________ formed new _____________with new ___________ are formed is a change in the _________ of a substance How it occurs: How it occurs: ____________________ bonds (chemical ____________________ bonds are broken bonds) are broken the distance between molecules changes atoms are rearranged How do you know if a change is chemical: How do you know if a change is physical: no new colour new smell new colour no new smell heat/light might be given off change in shape bubbles or gas formed change in state/phase solid material forms in liquid (precipitate) difficult to reverse (undo) Examples: Examples mixing things together burning __________________________ explosions phase change stove top cooking Types of phase changes: Types of energy changes: exothermic: releases heat (KABOOM!!) endothermic: absorbs heat
3.2 - Changes in Matter There are two types of changes matter can undergo. PHYSICAL CHANGE CHEMICAL CHANGE What is it? no _____________________ formed is a change in the _________ of a substance How it occurs: ____________________ bonds are broken the distance between molecules changes How do you know if a change is physical: no new colour no new smell change in shape change in state/phase Examples: mixing things together __________________________ phase change Types of phase changes: What is it? new _____________with new ___________ are formed How it occurs: ____________________ bonds (chemical bonds) are broken atoms are rearranged How do you know if a change is chemical: new smell new colour heat/light might be given off bubbles or gas formed solid material forms in liquid (precipitate) difficult to reverse (undo) Examples burning explosions stove top cooking Types of energy changes: exothermic: releases heat (KABOOM!!) endothermic: absorbs heat
03-unit_3_student_notes_5.docx