Chemical & Physical Changes

What is a physical change?

• When a substance changes shape or form but stays the same chemically - it is the same substance.

• When a substance changes chemically -- it becomes a new substance.

• When a substance is turned into a new substance but still looks the same.

• When a substance stays the same but changes color or temperature.

Tags

NGSS.MS-PS1-4

What is a chemical change?

• When a substance stays the same but changes color or temperature.

• When a substance changes shape or form but stays the same chemically - it is the same substance.

• When a substance is turned into a new substance but still looks the same.

• When a substance changes chemically -- it becomes a new substance.

Tags

NGSS.MS-PS1-2

What would an example of a physical change be for an iron nail?

• Rusting in the rain and humid air

• Corroding after being exposed to salt water

• Being bent while it's hammered

• Iron reacting with an acid to form hydrogen gas

What are some other examples of a physical change? (choose 3)

• Freezing water.

• Digesting food

• Sugar dissolving in water

• Cutting an apple into slices.

• Burning paper

Mark the 3 indicators that a chemical change / reaction is taking place?

• Production of a precipitate

• Color change

• Change in shape or form

• Melting

• Temperature change

Tags

NGSS.MS-PS1-2

Mark the examples where a chemical change is taking place: (3)

• Making ice cubes

• A glowstick (like you might see on Halloween)

• A rusty old truck

• Blowing up a balloon

• Burning a piece of wood

Tags

NGSS.MS-PS1-2

Which kind of reaction releases energy?

• Endothermic

• Ectothermic

• Exothermic

• Heatothermic

Tags

NGSS.MS-PS1-4

Which kind of reaction absorb energy?

• Exothermic

• Ectothermic

• Heatothermic

• Endothermic

Tags

NGSS.MS-PS1-4

In which kind of reaction do the products have more energy than the reactants?

• Endothermic

• Exothermic

• It can happen in both types, it depends on the products made.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

This graph shows which kind of reaction

• Exothermic

• Ectothermic

• Endothermic

• Heatothermic

Tags

NGSS.MS-PS1-4