Chase Unit 3 Chemistry Assessment

Front

What is the Empirical Formula?

Back

A formula that shows the lowest whole number ratio of elements in a compound.

Front

What does the Law of Conservation of Mass state?

Back

Matter is neither created nor destroyed, just transferred.

Front

Using the equation Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l), how many moles of iron can be made from 6 moles H2?

Back

4 moles Fe.

Front

What is the formula to calculate molarity?

Back

Molarity (M) = moles of solute / liters of solution.

Front

What is the molarity of a solution made by dissolving 2 moles of CaCO3 in 1.22 L of solution?

Back

1.64 M.

Front

What is a synthesis reaction?

Back

A reaction where simpler substances combine to form a new, complex substance.

Front

What is a decomposition reaction?

Back

A reaction where a complex substance breaks down into simpler substances.

Front

What is a single replacement reaction?

Back

A reaction where one element replaces another in a compound.

Front

What is a double replacement reaction?

Back

A reaction where two compounds exchange ions to form two new compounds.

Front

What is the difference between a molecular formula and an empirical formula?

Back

A molecular formula shows the actual number of atoms, while an empirical formula shows the simplest ratio.