Physical and Chemical Change and Conservation of Matter

Which of the following provides the most clear evidence of a chemical change during the baking of a cake?

• The cake hardens

• The cake gets smaller.

• The cake undergoes a change of states.

• The cake produces a new chemical in gas form.

Tags

NGSS.MS-PS1-2

Which of the following evidences best demonstrate a chemical change during the process of rusting?

• The metal turns shiny.

• The metal becomes brown.

• The metal forms rust on its surface.

• The metal changes shape.

Tags

NGSS.MS-PS1-2

How does burning wood demonstrate a chemical change?

• The wood produces both ash and smoke. 

• The wood changes shape.

• The wood absorbs heat but remains chemically unchanged.

• The wood gets hotter and broken apart.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following demonstrate chemical changes? Choose 2.

• Ice cream melting

• Breaking a Pencil

• Cooking Pancakes

• Crumble up a sheet of paper

• Bicycle Rusts When left outside

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What are characteristics of a Chemical Change? Choose 2

• New Substance Formed

• Item changes shape

• Energy is Produced or Lost

• Ice Melting

• Watering Freezing

Tags

NGSS.MS-PS1-2

What happens when baking soda is mixed with vinegar?

• Baking soda and vinegar merely form a heterogeneous mixture.

• Baking soda and vinegar create heat but no chemical change occurs.

• Baking soda and vinegar react to form carbon dioxide, a new substance.

• Baking soda and vinegar form a liquid solution but no new substance is formed.

   

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens when playdough is reshaped into a different objects?

• Chemical Change

• Not a Chemical Change

• Permanent Physical change

• Change cannot be reversed.

What kind of change is it when water freezes into ice and can then melt back into water?

• reservable chemical change

• irreservable physical change

• reservable physical change

• irreservable chemical change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If you dissolve in salt in water and then evaporate the water by heating it and leaving only the salt behind, this illustrates:

• The sugar and water formed a new material.

• The sugar and water formed an irreversible solution.

• The dissolving of salt is a permanent transformation.

• The process of dissolving salt is a reversible change.

Tags

NGSS.MS-PS1-4

Which properties of a chocolate candy bar will stay about the same after the candy bar is melted? 

• shape and physical state

• mass and color

• temperature and hardness

• thickness and texture