Chemical

Covalent bonds form between ---

• nonmetals.

• metals and metals

• metals and nonmetals

Atoms that gain an electron have an electric charge of ---

• -1.

• -2.

• +1.

• +2.

Tags

NGSS.MS-PS2-3

If an atom has 7 protons and 7 electrons, its electric charge is ---

• -7

• -14

• 0

• +7

Atoms form compounds to become more ---

• reactive

• stable

• explosive

• toxic

Atoms gain lose, gain, or ______electrons to get a stable outer energy level.

• share

• split

• create

• destroy

Tags

NGSS.MS-PS1-1

Which of the following is NOT a covalent bond?

• K₂S

• H₂O

• I₂

• CO₂

Tags

NGSS.MS-PS1-1

Which of the following is NOT an ionic bond?

• NH₃

• KCl

• K₃N

• NaCl

How many carbon atoms (C) are in a CO₂ molecule?

• 1

• 2

• 3

• 0

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms (H) are in a molecule of H₂O?

• 1

• 2

• 3

• 0

Tags

NGSS.MS-PS1-1

The small number to the right of an elemental symbol  ( H₂₎ is called?

•  a subscript 

• a coefficient 

• a variable 

• a divisor