balancing equations

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

Front

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

Back

Count the subscripts in the chemical formula. For example, in C2H8O, there are 2 carbon (C), 8 hydrogen (H), and 1 oxygen (O) atom, totaling 11 atoms.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How do you balance a chemical equation?

Back

Adjust the coefficients in front of the compounds to ensure the same number of each type of atom appears on both sides of the equation.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What does it mean to have a subscript in a chemical formula?

Back

A subscript indicates the number of atoms of the element in one molecule of the compound. For example, in H2O, the '2' indicates there are 2 hydrogen atoms.

Front

What is the significance of balancing equations in chemistry?

Back

Balancing equations is crucial because it reflects the conservation of mass and allows chemists to predict the amounts of reactants and products involved in a reaction.

Front

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

Back

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

Front

What is the balanced form of the equation P₄ + O₂ → P₂O₃?

Back

The balanced equation is P₄ + 3 O₂ → 2 P₂O₃.

Front

Which of the following equations is balanced: PbO₂ + 2H₂ → H₂SO₄ or 2Na + 2H₂O → 2NaOH + H?

Back

The balanced equation is 2Na + 2H₂O → 2NaOH + H.