Balancing Reactions Gen Chem

__Na + __Cl₂ --> __NaCl

• 1,1,2
• 2,1,2
• 2,1,1
• already balanced

Tags

NGSS.HS-PS1-7

__H₂O₂ --> __H₂O + __O₂

• already balanced
• 2,1,1
• 2,2,1
• 2,1,2

Tags

NGSS.HS-PS1-7

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with
• must be an even number
• can be different to the number you finish with
• changes depending on how much energy is formed

Tags

NGSS.HS-PS1-7

__Al + __Fe₃N₂ -->__AlN + __Fe

• already balanced
• 4,2,4,6
• 2,1,2,3
• 1,2,1,3

Tags

NGSS.HS-PS1-7

__Na + __Cl₂ --> __NaCl

• 1,1,2
• 2,1,2
• 2,1,1
• already balanced

Tags

NGSS.HS-PS1-7

_P₄+_O₂ →  _P₂O₃

• 3 P₄+1 O₂ → 2 P₂O₃
• 1 P₄+1 O₂ → 2 P₂O₃
• 1 P₄+ 3 O₂ → 2 P₂O₃
• 1 P₄+ 2 O₂ → 3 P₂O₃

Tags

NGSS.HS-PS1-7

The red numbers in the image represent

• subscripts

• coeffiecients

• roman numerals

• none of the answer options are correct

Tags

NGSS.HS-PS1-7

Why must the number of atoms on either side of the arrow be equal to each other in a chemical equation?

• to abide by the law of conservation of energy

• to abide by law of conservation of mass

• to abide by the law of fundamental equations

• because everything must be even for the universe to stay in balance

Tags

NGSS.HS-PS1-7

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7

How many atoms of O in the reactants?

HCl + NaOH --> NaCl + H₂O

Tags

NGSS.MS-PS1-1