Balancing Chemical Equations

Front

What is a subscript in a chemical formula?

Back

A subscript is the small number below the element symbol that tells the number of atoms of that element.

Front

How many Nitrogen atoms are in (NH₄)₂CrO₄?

Back

There are 2 Nitrogen atoms in (NH₄)₂CrO₄.

Front

Balance the equation: H₂ + Cl₂ ---> HCl

Back

The balanced equation is H₂ + Cl₂ ---> 2HCl.

Front

Which of the following is balanced? Mg + HCl --> H₂ + MgCl₂, H₂O + CO₂ --> H₂CO₃, KClO₃ --> KCl + O₂, H₂ + O₂ --> H₂O

Back

H₂O + CO₂ --> H₂CO₃ is balanced.

Front

How many Hydrogen atoms are in 3(NH₄)₂CrO₄?

Back

There are 24 Hydrogen atoms in 3(NH₄)₂CrO₄.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound in a chemical equation to indicate how many molecules or moles of that compound are involved.

Front

How do you determine the number of atoms in a compound with parentheses?

Back

Multiply the subscript outside the parentheses by the subscripts of each element inside the parentheses.

Front

What is the balanced equation for the combustion of methane (CH₄)?

Back

The balanced equation is CH₄ + 2O₂ ---> CO₂ + 2H₂O.