Unit 5_Chemical Reactions Study Guide

Look at the activity series of metals in the table above. Which metal could X represent in the reaction

X(s) + Ca(NO₃)₂ -> Ca(s) + X(NO₃)₂ (aq)?

• Ba

• Fe

• Mg

• Zn

Based on the solubility rules on pg 6 of the reference table, what would the precipitate be in this reaction

ZnSO₄(aq) + 2AgCl(aq) -> Ag₂SO₄(?) + ZnCl₂(?)

• ZnCl₂

• Ag₂SO₄

• Ag₂SO₄ and ZnCl₂

• no precipitate

Which equation for the complete combustion of propane (C₃H₈) is correctly balanced?

• C₃H₈ + 3O₂ -> 2CO₂ + 4H₂

• C₃H₈ + 7O₂ -> 3CO₂ + 4H₂O

• C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

• 2C₃H₈ + 10O₂ -> 6CO₂ + 8H₂O

Chromium (II) reacts with oxygen gas to form solid CrO. What type of reaction is this?

• decomposition

• synthesis

• combustion

• neutralization

The products of a double replacement neutralization reaction are always…

• acids & bases

• salt & water

• oxygen & water

• none of these

In a single replacement reaction where one metal replaces another, which of the following must be true?

• these reactions only occur if the bonded metal is gold

• the elemental metal and bonded metal must have opposite positions on the activation series table

• the elemental metal must occur lower on the activation series table than the bonded metal

• the elemental metal must occur higher on the activation series table than the bonded metal

According to the solubility rules, which of the following would form a precipitate?

• Ca(NO₃)₂

• Mg(OH)₂

• NaBr

• K₂S

What is the correct chemical formula for the compound iron (III) oxide?

• FeO

• FeO₂

• Fe₃O

• Fe₂O₃

Which occurs if an electron transitions from n = 5 to n = 2 in a hydrogen atom?

• energy is absorbed and visible light is emitted

• energy is released and visible light is emitted

• energy is released and visible light is not emitted

• energy is absorbed and visible light is not emitted

Which group of elements is listed in order of decreasing atomic radii?

• boron, carbon, nitrogen, oxygen

• fluorine, chlorine, bromine, iodine

• phosphorous, selenium, iodine, radon

• sodium, potassium, rubidium, cesium