Balancing, Reactions, Percent Composition, and Empirical Formula

Front

What is the formula to calculate moles from grams?

Back

Moles = Mass (g) / Molar Mass (g/mol)

Front

What is the molar mass of Magnesium (Mg)?

Back

24.31 g/mol

Front

How many moles are in 19.82 g of Mg?

Back

0.815 mol Mg

Front

What are reactants in a chemical equation?

Back

Substances that undergo a chemical change, found on the left side of the equation.

Front

What does a balanced chemical equation represent?

Back

It shows that the number of atoms for each element is the same on both sides of the equation.

Front

What is the empirical formula?

Back

It tells what elements are present and gives the simplest whole-number ratio of atoms.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest ratio of elements, while molecular formula shows the actual number of atoms in a molecule.

Front

What is the significance of balancing chemical equations?

Back

It follows the law of conservation of mass, ensuring that matter is neither created nor destroyed.

Front

How many oxygen atoms are in 3Al(NO3)3?

Back

9 oxygen atoms.

Front

What is the total number of oxygen atoms in 2Mg3(PO4)2?

Back

8 oxygen atoms.