7th Science Unit 1 Review 9/3/24

Which term best identifies this model?

• atom

• element

• mixture

• compound molecule

Tags

NGSS.MS-PS1-1

Which image is the best model of a diatomic element?

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• 
• 
• 

Tags

NGSS.MS-PS1-1

Identify the monatomic element.

• 
• 
• 
• 

Which label is BEST for this image?

• monatomic elements

• homogenous mixture

• compound molecules

• elemental molecules

Tags

NGSS.MS-PS1-1

Pictured is a pure substance.

Study this model of a compound molecule. If the molecule is NaCO₃, which color bead must represent oxygen?

• black

• white

• red

• not enough information

Tags

NGSS.MS-PS1-1

An example of a pure substance is CO₂, the molecule for carbon dioxide. Which term describes it best?

• Monoatomic atom

• a mixture

• Elemental molecule

• Compound molecule

Tags

NGSS.MS-PS1-1

Valence electrons refer to the outermost electrons in the outer energy level. They determine an atom's reactivity. How many valence electrons does Lithium (pictured) have?

• 1

• 2

• 3

• 7

Tags

NGSS.MS-PS1-1

Valence electrons are the number of electrons on the outside shell. How many valence electrons does the atom on the left have?

• 2

• 4

• 6

• 8

Which statement is WRONG about these atoms?

• The atom on the left is oxygen because it has 8 protons.

• These atoms are in the same group on the periodic table.

• The atom on the right is more reactive.

• We know the atomic mass of the left atom is approximately 16 and the right atom is approximately 24.

Tags

NGSS.MS-PS1-1

According to this picture, are diatomic molecules also classified as elements?

• yes

• no

Tags

NGSS.MS-PS1-1