Balance Equation

Which is the correct way to balance the chemical equation Al + O₂ → Al₂O₃?

• 4Al + 3O₂ → 2Al₂O₃

• 2Al + O₂ → Al₂O₃

• 2Al + 3O₂ → Al₂O₃

• 4Al + 3O₂ → Al₂O₃

Tags

NGSS.MS-PS1-5

Which best describes how to balance the chemical equation Mg + O₂ → MgO to support the law of conservation of mass?

• Add the coefficient 2 before the Mg on both sides of the equation.

• Add the coefficient 2 before the O2 on the left side of the equation.

• Add the coefficient 2 before the Mg on the left side of the equation.

• Add the coefficient 2 before the MgO on the right side of the equation.

Tags

NGSS.MS-PS1-5

Which products would balance the equation CaCl₂ + 2Li → ?

• none of these

• 2LiCl + Ca

• LiCl + Ca

• Li2Cl + Ca

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best represents a balanced equation?

• 2Mg(s) + O₂(g) → 2MgO(s)

• Mg(s) + 2O₂(g) → 2MgO(s)

• Mg(s) + O₂(g) → 2MgO(s)

• 3Mg(s) + 2O₂(g) → MgO(s)

Tags

NGSS.MS-PS1-5

The reaction CaCO₃ → CaO + CO₂ takes place in a closed system. Which best describes this balanced equation?

• Reactants and products are equal in the chemical reaction.

• More products and less reactants are produced.

• More reactants and less products are produced.

• The equation is not balanced.

Tags

NGSS.MS-PS1-5

A chemical reaction is represented by the equation BeO + 2NaCl → Na₂O + _______. Which substance would make the equation true and balanced?

• BeCl₂

• BeO

• Be₂Cl

• 3Be₂Cl

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which best explains how the chemical reaction 2H₂ + O₂ → 2H₂O follows the law of conservation of mass?

• The same number of hydrogen and oxygen atoms are on both sides of the equation.

• The hydrogen and oxygen molecules combine to form water.

• Hydrogen and oxygen are held together by strong chemical bonds.

• There are hydrogen and oxygen atoms on both sides of the equation.

Tags

NGSS.MS-PS1-5

Which equation is balanced according to the Law of Conservation of Mass?

• 2NaCl + Mg → MgCl₂ + 2Na

• NaCl + Mg → MgCl₂ + Na

• 2NaCl + Mg → MgCl₂ + Na

• 3NaCl + Mg → MgCl₂ + 2Na

Tags

NGSS.MS-PS1-5

Which best describes a chemical reaction applying the law of conservation of mass?

• a balanced equation in which the reactants and products are equal

• an equation which uses energy

• an equation which does not use energy

• an unbalanced equation in which the reactants and products are unequal

Tags

NGSS.MS-PS1-5

Which is the correct way to balance the chemical equation @@ ext{C}_3 ext{H}_8 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@?

• A) @@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

• B) @@ ext{C}_3 ext{H}_8 + 4 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

• C) @@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 4 ext{CO}_2 + 3 ext{H}_2 ext{O}@@

• D) @@ ext{C}_3 ext{H}_8 + 6 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

Tags

NGSS.MS-PS1-5