Conservation of Mass and Balancing Equations

What coefficient for O2 demonstrates the law of conservation of mass?

CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What are the larger numbers that you CAN CHANGE in a chemical equation? 

• Coefficient 

• Products

• Reactants

• Subscripts

Balance this equation:

HgO ---> Hg + O₂

• It is balanced.

• 2HgO ---> 2Hg + O₂

• 2HgO ---> Hg + O₂

• HgO ---> Hg + 2O₂

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

7 g of hydrogen reacts with 17 g of oxygen to produce ______ g of water

• 14

• 24

• 38

• 62

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?

• 55.8 g

• 64.2 g

• 60.0 g

• 126.0 g

Tags

NGSS.MS-PS1-5

Which chemical equation supports the law of conservation of mass?

• Equation (a)

• Equation (b)

• Equation (c)

• Equation (d)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The substances listed on the left side of a chemical equation are the

• Products

• Coefficients

• Precipitates

• Reactants

Which is Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O

• H₂+O₂-----2H₂O₄

• 4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5