STAAR Science

You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)

• purple color

• smoke

• ice formation

• fire

• a yellow precipitate

Tags

NGSS.MS-PS1-2

We know that there was a chemical reaction occurring when 2 clear liquids were mixed together. That is because we show the production of a _____________.

• solid.

• precipitate.

• gas.

Tags

NGSS.MS-PS1-2

What vocabulary word completes the missing box in the table?

• electron cloud

• nucleus

• atom

• electron

Tags

NGSS.MS-PS1-1

What can you do to find the number of neutrons in an atom?

• It's the same as the atomic #.

• Ask Sierra!

• Subtract the atomic # (protons) from the mass # (protons and neutrons)

• Multiply the mass # (protons and neutrons) and the atomic # (protons)

Valence Electrons of Argon

• 5

• 6

• 7

• 8

Tags

NGSS.HS-PS1-1

True or False: Atoms that have a valence electrons of less than eight are not stable.

• true

• false

How many valence electrons are found in atoms of group 14?

• 4

• 3

• 14

• 16

What group is the most reactive metals?

• 2

• 18

• 1

• 16

What group is the most reactive non metals?

• 1

• 17

• 2

• 1

Which of the following elements is a METAL?

• Na

• Ne

• As