Physical and Chemical Properties, Changes and Reactions

Is sharpening a pencil a physical or chemical change?

• Physical 

• Chemical

Is bending copper wire a physical or chemical change?

• Physical

• Chemical

Blending together ingredients into a smoothie is what kind of change?

• chemical change

• physical change

• both types of changes

• none of these

Any time something burns, it is going through a

• chemical change

• physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A copper penny turning green after a few years is an example of ...

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

On a camping trip, Mr. Markowitz roasts a marshmallow in the campfire. He notices that the roasted marshmallow smells and tastes differently than the uncooked marshmallows. What change has taken place AND how does Mr. Markowitz know?

• A chemical change because the marshmallow changed in taste, color, and smell

• A chemical change because the marshmallow was heated up.

• Only a physical change because the marshmallow changed in size

• No change because the marshmallow is not a new substance

Tags

NGSS.MS-PS1-2

The end results of a chemical reaction are called

• products

• reactants

• explosion

• a pile of goo

Tags

NGSS.MS-PS1-5

The substances that go into a chemical reaction are called

• reactants

• products

• molecules

• mixtures

Tags

NGSS.MS-PS1-5

This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂). This represents a chemical change because

• there is only one carbon atom.

• the products and reactants are made of atoms and molecules.

• there are the same number of atoms before and after.

• the atoms have rearranged to form new molecules.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A mixture is the result of a physical change because...

• The parts can be separated

• A new substance is made

• There is a chemical reaction

• One part of the mixture disappears