Chemistry Diagnostic Test

The halogens are located on the periodic table in Group

• 1

• 2

• 17

• 18

An ionic bond results from electrical attraction between

• cations and anions.

• atoms.

• dipoles.

• orbital.

The principle that states that atoms tend to form compounds in which each

atom has eight electrons in its highest occupied energy level is called the

• rule of eights.

• configuration rule.

• Avogadro principle.

• octet rule.

The formula for phosphoric acid is

• HPO4.

• H(PO4)2.

• H2PO3.

• H3PO4.

To balance a chemical equation, it is permissible to adjust the

• coefficients.

• subscripts.

• formulas of the products.

• number of products.

In a chemical equation, the symbol (aq) indicates that the substance is

• water.

• dissolved in water.

• an acid.

• Insoluble.

The use of a double arrow in a chemical equation indicates that the reaction

• is reversible.

• requires heat.

• is written backward.

• has not been confirmed in the laboratory.

Knowing the mole ratio of a reactant and product in a chemical reaction

would allow you to determine

• the energy released in the reaction.

• the speed of the reaction.

• the mass of the product produced from a known mass of reactant.

• whether the reaction is reversible.

For the reaction represented by the equation N2 + 3H2 → 2NH3, how many

moles of nitrogen are required to produce 18 mol of ammonia?

• 9

• 18

• 27

• 36

According to the kinetic-molecular theory, particles of an ideal gas

• attract each other but do not collide.

• repel each other and collide.

• collide but do not attract each other.

• do not collide and do not attract or repel each other.