Tangaroa Change

CHANGE BY TANGAROA

WHAT IS CHEMICAL CHANGE?

Chemical changes take place on the molecular level. A

chemical change produces a new substance. Examples of

chemical changes include combustion (burning), cooking an

egg, rusting of an iron pan, and mixing hydrochloric acid and

sodium hydroxide to make salt and water.

YEAST W E M A D E P I Z Z A D O U G H . W H E N W E M I X E D Y E A S T , WA R M WAT E R , A N D S U G A R A C H E M I C A L R E A C T I O N O C C U R R E D . T H I S C R E AT E D B U B B L E S O F A I R . W E A D D E D F L O U R T O T H E M I X T U R E T O C R E AT E A S T R E TC H Y D O U G H F O R O U R P I Z Z A .

WHAT IS PHYSICAL CHANGE?Physical changes are concerned with energy and states of

matter. A physical change does not produce a new substance. Changes in state or phase (melting, freezing, vaporization, condensation, sublimation) are physical changes. Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle.

JELLY

W E M A D E J E L LY U S I N G G E L AT I N E . W E A D D E D H O T WAT E R A N D T H E N C O O L E D I T T O M A K E A S O L I D . W H E N W E R E H E AT E D I T , I T T U R N E D B A C K I N T O A L I Q U I D . T H I S WA S A N E X A M P L E O F A P H Y S I C A L C H A N G E .

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