Physical Science Pre-Finals Exam

Which of the following is the correct sequence of a chemical equation?

• Reactant + Product

• Reactant → Product

• Product → Reactant

• Product + Reactant

What is stoichiometry?

• The study of chemical properties of elements and their compounds.

• The study of the composition, structure, and properties of matter and the changes it undergoes.

• The study deals with the calculation of quantities of substances in chemical reactions.

• The study of the behavior of matter and energy at the molecular and atomic level.

Tags

NGSS.MS-PS1-5

How can stoichiometry be used to calculate the mass of a product in a chemical reaction?

• By using the molar mass of the reactants and products

• By balancing the chemical equation

• By calculating the mole ratio of the reactants and products

• By using the volume of the reactants and products

Tags

NGSS.MS-PS1-5

In the equation Mg + O2(g) → MgO, how many molecules of Mg on the reactant side do we need to make our equation balance?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

It is reactants that are not used up when the reaction is finished.

• reactants

• limiting reagents

• solute

• excess reagents

It deals with the process that involves rearrangement of the molecular or ionic structure of a substance to form a new substance or product.

• chemical equilibrium

• chemical reaction

• chemical symbol

• Stoichiometry

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the stoichiometric coefficient of CaCl2 in the balanced chemical equation below? 2HCl + Ca(OH)2 → CaCl2 + 2H2O

• 1

• 2

• 0

• 4

Tags

NGSS.MS-PS1-5

What is the molar mass of H2O2 ?

• 67. 805 g/mol

• 17.031 g/mol

• 74.551 g/mol

• 34.014 g/mol

Which of the following equation below is balanced?

• Al+3O2→2Al2O3

• 4Al+O2→2Al2O3

• 4Al+3O2→Al2O3

• 4Al+3O2→2Al2O3

Tags

NGSS.MS-PS1-5

In the equation Mg+HCl→MgCl2+H2, how many molecules of hydrogen do we need to make hydrogen balanced?

• 3

• 6

• 2

• 7

Tags

NGSS.MS-PS1-5