Chemical Equations Quiz

Balanced chemical equations support the Law of Conservation of Mass. What does this law state?

• Matter is made up of energy and particles

• Matter has mass and takes up space

• Matter cannot be created or destroyed

• Matter cannot be rearranged or changed

Tags

NGSS.HS-PS1-7

An equation is considered balanced when:

• The charges within each compound are balanced

• There is the same number of atoms of each element on both sides of the equation

• The number of products equals the number of reactants

• A new chemical forms

The law of conservation of mass states that in a chemical reaction the mass of the reactants equals the mass of the products. Based on this information, what mass of hydrogen (H2) was produced in this reaction?

• 2g

• 10g

• 100g

• 210g

Tags

NGSS.HS-PS1-7

Which of these uses coefficients correctly to balance this equation? N2 + H2 → NH3

• N2 + 3H2 → 2NH3

• 2N2 + 2H2 → 4NH3

• N2 + H2 → NH3

• 3N2 + 4H2 → 6NH3

What is the coefficient?

• 3

• 5

• NH3

• H3

Tags

NGSS.HS-PS1-7

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

Which of the following is an example of a balanced chemical equation?

• 2H2 + O2 → H2O

• H2 + O2 → 2H2O

• 2H2 + O2 → 2H2O

• H2 + O2 → H2O

Tags

NGSS.HS-PS1-7

What is the purpose of balancing a chemical equation?

• To ensure that the reaction is possible

• To satisfy the Law of Conservation of Mass

• To determine the products of the reaction

• To calculate the amount of energy released

Tags

NGSS.HS-PS1-7

When balancing a chemical equation, what can be changed to achieve balance?

• Subscripts

• Coefficients

• Formulas of the compounds

• Both subscripts and coefficients

• balanced

• unbalanced

Tags

NGSS.HS-PS1-7