6. Basic Chemistry: Reaction in Aqueous Solution

Tono and Budi are conducting a chemistry experiment. They are observing a reaction where one reactant loses electrons and the other gains them. What type of reaction are they observing?

• Synthesis reaction
• Neutralization reaction

• Precipitation reaction

• Acid-base reaction
• Redox reaction

Reduction is a process in a chemical reaction. What reduction reaction is?

• Reduction reaction is the process where a substance destroys electrons during a chemical reaction.

• A reduction reaction involves the loss of electrons by a chemical species.
• A reduction reaction involves the gain of electrons by a chemical species.
• Reduction reaction is the process where a substance creates electrons during a chemical reaction.

• A reduction reaction involves the release of electrons by a chemical species.

What is the meaning of oxidation in redox reaction?

• Gain of electrons
• The destruction of electrons.

• Increase in mass
• The creation of electrons.

• Loss of electrons

An aqueous solution is .........................

• a solution that contains oil as the solvent
• a solution that is solid at room temperature
• a solution in which the solvent is water
• any liquid with another compound dissolved in it

• an ionic compound with water dissolved in it

Which of the following compounds is soluble?

• potassium carbonate

• copper carbonate

• aluminium carbonate

• calcium carbonate

• ammonium carbonate

What would be the formula of the precipitate that forms when Pb(NO₃)₂ (aq) and K₂SO₄ (aq) are mixed?

• PbK₂

• PbSO₄

• KSO₄

• Pb(NO₃)₂

• KNO₃

Considering the following precipitation reaction:

Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)

Which compound would not form ions in the complete ionic equation?

• PbI₂

• all species form ions

• KNO₃

• Pb(NO₃)₂

• KI

Which of the following statements about writing molecular, complete, and net ionic equations is true?

• A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction.

• A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution.

• A net ionic equation is an equation showing only the species that actually participate in the reaction.

• A spectator ion remains unchanged in the reaction and appears on both sides of the equation.

• All three types of equations are essential in different contexts and serve different purposes.

Which of the following compounds is insoluble?

• AgCl
• MgSO₄

• KBr
• Na₂CO₃

• AlCl₃

What is the molarity of a solution containing 4 moles of KCl in 2.5 L of solution?

• 2.5 M
• 10.0 M

• 0.8 M
• 1.6 M
• 5.6 M