Chemical Equations Balancing Practice

Charlie is balancing an equation. She has identified the atoms and counted the number of each in the reactants and products. What would Charlie adjust to make the number of atoms in the reactants the same as the number of atoms in the products?

• coefficients

• subscripts

• superscripts

• parentheses

Tags

NGSS.MS-PS1-5

One half of a balanced chemical equation is shown.

3Mg(OH)₂ + 2H₃PO₄

Which lists the numbers of each atom the other half of the equation would contain?

• 3 Mg, 2 P, 14 O, 12 H

• Mg, 2 P, 14 O, 6 H

• 3 Mg, 8 P, 7 O, 6 H

• 6 Mg, 6 P, 2 O, 12 H

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The amount of oxygen in the reactants is 4 atoms. In the products, the oxygen is distributed to water (H₂O) and O₂ gas. Which coefficients would be placed in front of water and oxygen?

• 2 in front of water and 2 in front of oxygen

• 1 in front of water and 2 in front of oxygen

• 1 in front of water and 1 in front of oxygen

• 2 in front of water and 1 in front of oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is the balanced equation for V₂O₅ + CaS → CaO + V₂S₅?

• V₂O₅ + CaS → CaO + V₂S₅

• 5V₂O₅ + 5CaS → 10CaO + 5V₂S₅

• 3V₂O₅ + 3CaS → 3CaO + 3V₂S₅

• V₂O₅ + 5CaS → 5CaO + V₂S₅

Tags

NGSS.MS-PS1-5

When balanced, which equation would have the coefficient 3 in front of any of the reactants?

• Zn + HCl --> ZnCl₂ + H₂

• H₂SO₄ + B(OH)₃ --> B₂(SO₄)₃ + H₂O

• Fe + AgNO₃ --> Fe(NO₃)₂ + Ag

• C₂H₄O₂ + O₂ --> CO₂ +H₂O

Tags

NGSS.MS-PS1-5

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!

• No!

Tags

NGSS.MS-PS1-5

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

• yes

• no

Tags

NGSS.MS-PS1-5

Balance this equation...
HgO --> Hg + O₂

• It is balanced 

• 2HgO --> Hg + O₂

• 2HgO --> 2Hg + O₂

• I don't know...Oh well!

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃

• 2 Fe + 3O₂ -> Fe₂O₆

• 4 Fe + O₆ -> 2Fe₂O₃

• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

Balance this equation...
H₂ + Cl₂ --> HCl

• It is balanced 

• 3H₂ + Cl_{2 -->} 6H₂Cl

• H₂ + Cl_{2 -->} 2HCl

Tags

NGSS.MS-PS1-5