Final ExamReview - Chemistry F23

Front

What is the molar mass of NaOH?

Back

40 g/mol

Front

How many moles of hydrogen are needed to react with 2 moles of nitrogen in the reaction N2 + 3H2 → 2NH3?

Back

6 moles

Front

How many neutrons does the isotope of lithium (Li-7) have?

Back

4 neutrons

Front

Balance the equation: _Zn + _HCl → _ZnCl2 + _H2

Back

1, 2, 1, 1

Front

Which Lewis Dot structure for nitrogen is correct?

Back

B

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the principle behind balancing chemical equations?

Back

The principle of conservation of mass states that matter cannot be created or destroyed, so the number of atoms of each element must be the same on both sides of the equation.

Front

What is the formula for calculating moles from mass?

Back

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

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

Coefficients indicate the relative number of moles of each reactant and product involved in the reaction.

Front

What is a Lewis Dot structure?

Back

A diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist.