Balancing Chemical Equations

How many HCl molecules do you need to balance this equation?

• 4

• 1

• 2

• 3

Tags

NGSS.MS-PS1-5

Which coefficients would balance this chemical equation? ​ (a)   Fe₂O₃ ---> ​ (b)   Fe + ​ (c)   O₂

• 2

• 4

• 3

Tags

NGSS.MS-PS1-5

Balance this equation ​ (a)   N₂ + ​ (b)   H₂ --> ​ (c)   NH₃

• 1

• 3

• 2

Tags

NGSS.MS-PS1-5

What coefficient should be used to make the following equation balanced? N₂+O₂--> ​ (a)   NO

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2

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

• 3

• 2

Tags

NGSS.MS-PS1-5

Balance this equation. _CF₄ + _Br₂ → _CBr₄ + _F₂

• 3,1,2,1

• 1,2,1,2

• 2,2,2,2

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

• created

• destroyed

• changed

• equal

Tags

NGSS.MS-PS1-5

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes

• no

Tags

NGSS.MS-PS1-5

Balance the following equation:

___ H₂+ ___ O₂→___ H₂O

• 1, 1, 3

• 2, 2, 2

• 1, 2, 1

• 2,1, 2

Tags

NGSS.MS-PS1-5