EDM Chem A Unit 3 Review

What type of reaction is shown here: H2 + Cl2 → 2HCl

• Synthesis

• Decomposition

• Combustion

• Replacement

What type of reaction is shown here: CH4 + 2O2 → CO2 + 2H2O

• Synthesis

• Decomposition

• Combustion

• Replacement

In the single displacement reaction shown here, which element will Cl replace?

2NaBr + Cl2 →

• Na

• Br

• Cl

• No reaction will occur

Based on the reactivity series of metals, which of the following reactions will most likely occur?

• 2AlBr3 + 3Zn → 3ZnBr2 + 2Al

• CaBr2 + 2Na → 2NaBr + Ca

• MgBr2 + H2 → 2HBr + Mg

A substance is followed by the symbol (l) in a chemical equation. What does this symbol represent?

• The substance has the least number of molecules in the equation.

• The substance is in the pure liquid state.

• The substance is produced last in the reaction.

• The substance is dissolved in a liquid solution.

When considering the following equation: AgBr(s) → Ag(s) + Br2(g)

What is wrong with this equation as it is written?

• There are more substances on the right than left

• There is a gas on the right side, but not on the left

• There is more mass represented on the right than on the left

• The silver atoms on the right are not bonded to anything.

Which of the following describes an Exothermic reaction?

• The reaction between ammonium nitrate and water absorbs heat from the surrounding environment.

• Ammonium chloride dissolved in a beaker of water makes the beaker cold.

• Water separates into hydrogen and oxygen when an electric current is run through it.

• Methane and oxygen are combined to produce methanol and heat.

Which of the following describes an Endothermic reaction?

• Methane and oxygen are combined to produce methanol and heat.

• Three drops of concentrated sulfuric acid added to 100 milliliters of water in a beaker makes the beaker hot.

• Uranium atoms are split to produce nuclear energy.

• Water separates into hydrogen and oxygen when an electric current is run through it.

Choose the correct order of coefficients to balance the following reaction:

_ KClO3 --> _ KCl + _ O2

• 1, 2, 3

• 2, 2, 3

• 3, 2, 2

• it is already balanced

The half-reaction of an oxidation-reduction reaction shows that iron gains electrons. What does this electron gain mean for iron?

• Iron is neutralized

• Iron is oxidized

• Iron is reduced

• Iron has dissolved