Balancing Reactions

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4

Tags

NGSS.MS-PS1-1

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20

• 12

Tags

NGSS.MS-PS1-1

How many Nitrogen atoms are in (NH₄)₂CrO₄?

• 1

• 2

• 8

• 6

Tags

NGSS.MS-PS1-1

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

• 4

• 2

• 8

• 24

• 9

Tags

NGSS.MS-PS1-1

A subscript is the small number below the element symbol that tells the number of _______ of that element.

• atoms

• valence electrons

• protons

• elements

Tags

NGSS.MS-PS1-1

Balance this equation:

H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Tags

NGSS.MS-PS1-5

Balance this equation:

HgO ---> Hg + O₂

• It is balanced.

• 2HgO ---> 2Hg + O₂

• 2HgO ---> Hg + O₂

• HgO ---> Hg + 2O₂

Tags

NGSS.MS-PS1-5

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃
•  P₄+ O₂ --> 2 P₂O₃
•  P₄+ 3 O₂ --> 2 P₂O₃
•  P₄ + O₂ --> P₄O₂

Tags

NGSS.MS-PS1-5

Which of the following is balanced?

• Mg + HCl --> H₂ + MgCl₂

• H₂O + CO₂ --> H₂CO₃

• KClO₃ --> KCl + O₂

• H₂ + O₂ --> H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5