Chemistry S2 Exam Review set 1

Avogadro’s number is based on the number of atoms in exactly 12 g of __________.

• nitrogen-14

• hydrogen-1

• carbon-12

• oxygen-16

To convert from moles of one substance to moles of another substance, a(n) __________ is used.

• molar concentration

• mole ratio

• molar mass

• molar cap

Which of the following conversions uses the fewest number of steps?

• moles of a reactant to grams of a product

• grams of a reactant to grams of a product

• grams of a reactant to moles of a product

• moles of a reactant to moles of a product

Molar mass is typically expressed in which of the following units?

• g/mol

• u/mol

• kg/mol

• none of these

What term describes the mathematical relationships between the amounts of reactants and products in a chemical reaction?

• mathematics

• molecular chemistry

• stoichiometry

• chemistry

Tags

NGSS.HS-PS1-7

An element’s atomic mass, expressed in atomic mass units on the periodic table, is equal to its __________ mass.

• actual

• empirical

• theoretical

• molar

What provides the information needed to change grams of a substance to moles?

• the periodic table

• the coefficients in the chemical formula of the substance

• the oxidation numbers of the elements in the substance

• the electronegativity values of the elements in the substance

Which formula indicates the elements that are present in a compound and gives the simplest whole-number ratio of the atoms?

• empirical

• molecular

• mathematical

• structural

What is the ratio of Fe₂O₃ to CO₂ in the following reaction? Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g)

• 3:2

• 1:2

• 1:3

• 1:1

Tags

NGSS.HS-PS1-7

Which of the following is the correct value for Avogadro’s number?