Balancing Chemistry

AgNO₃ + Cu → Cu(NO₃)₂ + Ag

• 2 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 1 Ag

• 2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag

• 1 AgNO₃ + 2 Cu → 2 Cu(NO₃)₂ + 1 Ag

• 3 AgNO₃ + 2 Cu → 3 Cu(NO₃)₂ + 2 Ag

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this equation:  H₂ + N₂ → NH₃

•  H₂ + 4N₂ → NH₃

•  H₂ + 3N₂ → 2NH₃

•  3H₂ + N₂ → 2NH₃

•  2H₂ + 2N₂ → 2NH₃

Tags

NGSS.MS-PS1-5

Balance this reaction:

____ Na₃PO₄ + ____ KOH ---> ____ NaOH + ____ K₃PO₄

• 1,3,3,1

• 1,3,2,1

• 2,3,3,1

• 1,1,3,1

Tags

NGSS.MS-PS1-5

The numbers placed in ​ (a)   of formulas to balance equations are called ​ (b)   , and they multiply all the atoms in a ​ (c)   . Thus, the symbol “2NaHCO₃” indicates ​ (d)   units of sodium bicarbonate, which contain 2 Na atoms, 2 H atoms, 2 C atoms, and 6 O atoms

(2 X 3= 6, the coefficient times the subscript for O).

• front

• coefficients

• two

• formula

Balance this equation:

​ (a)   FeCl₂ + ​ (b)   Cl₂ --> ​ (c)   FeCl₃

• 2

• 1

• 3

• 4

Tags

NGSS.MS-PS1-5

When balancing an equation, you can change the ​ (a)   of a substance, but you cannot adjust any ​​ (b)   because that would change the formula.

• coefficient

• subscript

Tags

NGSS.MS-PS1-5

This unbalanced equation represents a chemical reaction:

Pb(NO₃)₂ + NaI → NaNO₃ + PbI₂

What is the coefficient for NaI once the equation is balanced?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Balance the following chemical reaction: SnO₂ + H₂ --> Sn + H₂O

• 2 SnO₂ + 2 H₂ --> 2 Sn + 2 H₂O

• SnO₂ + 2 H₂ --> Sn + 2 H₂O

• 2 SnO₂ + 3 H₂ --> 1 Sn + 2 H₂O

• SnO₂ + H₂ --> Sn + H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

___C₃H₈ +___O₂ --> ___CO₂ + ___H₂O

• 1,5,3,4

• 2,10,6,8

• already balanced

• 1,5,5,4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

_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.MS-PS1-5