PRACTICE TEST 3

What is a Lewis Dot Symbol?

• It shows all of the particles in the atom.

• Contains protons and neutrons

• the number of valence electrons in an element

• Contains protons and electrons

An atom in the ground state contains a total of 5 electrons, 5 protons, and 5 neutrons. Which Lewis dot diagram represents this atom?

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According to the Octet Rule, atoms of elements react with each other in order to attain ____ electrons in their outermost energy level or shell.

• 2

• 6

• 8

• 10

How do can atoms complete the octet rule?

• They lose or gain protons

• They lose or gain neutrons

• They lose or gain electrons in the outermost level

• They lose of gain electrons from the innermost level

What is the general formula for tetrahedral?

• AB₄

• AB₃

• AB₅

• AB₆

The geometry of a molecule with 5 bonding pairs of electrons and 0 lone pairs of electrons, AB₅

• Tetrahedral

• Trigonal Planar

• Trigonal pyramidal

• Trigonal bipyramidal

According to VSEPR theory, how many basic molecular geometries are there?

• 3

• 4

• 5

• 6

Which of the following statements is CORRECT for a reaction at an equilibrium?

• The rate of forward and reverse reactions are equal.

• The concentrations of product and reactant are equal.

• The forward and reverse reactions will stop.

• Always occur in an open system.

Which of the following is NOT the characteristic of a system in equilibrium?

• The rate of forward reaction is equal to the rate of reverse reaction.

• The concentrations of reactants and products remain constant.

• The concentration of the reactants and concentration of the products are equal.

• Reaction quotient, Q equals to the equilibrium constant, K.

Equilibria in which the substances are in the different phases are called

• dynamic equilibrium.

• equilibrium constant.

• homogeneous equilibria.

• heterogeneous equilibria.