Atoms Molecules Elements Compounds

Which of these models can be described as a compound?

• water

• carbon dioxide

• amonia

• methane

• All of them are compounds

Tags

NGSS.MS-PS1-1

Which one of the following is a compound?

• NaCl

• O2

• Hydrogen

• He2

Tags

NGSS.MS-PS1-1

What is a substance with unique physical and chemical properties that can't be reduced by chemical means.

• an element

• an atom

• a molecule

• a compound

What purpose do molecular models, drawings, and diagrams serve? (check all that apply)

• They allow us visual representations for things we can't normally see.

• They make concepts easier to understand.

• They make concepts more difficult to understand.

• They serve no purpose.

Tags

NGSS.MS-PS1-1

What type of model is pictured here?

• space filling model

• ball and stick model

Tags

NGSS.MS-PS1-1

A(n) ____________ between atoms determine whether they will bond to form a molecule.

• attraction

• compound

• repulsion

• bridge

Which of these is only a molecule and not a compound?

• a

• b

• c

• d

Tags

NGSS.MS-PS1-1

In a ball and stick model, what does the stick represent?

• An attraction between atoms

• A physical piece of matter

• An extension of an atom that connects to other atoms

• An additional atom that’s been converted into a bridge.

This picture represents which of the following?

• Element

• Compound

• Molecule

Tags

NGSS.MS-PS1-1

This picture represents which of the following?

• Element

• Compound

• Molecule

Tags

NGSS.MS-PS1-1