AC-HPAT Chemistry Exam Latest

AC-HPAT Chemistry Exam (Latest Update 2025 / 2026) | Questions & Answers | 100% Correct | Grade A - Algonquin

Question:

Why do metal orthodontic braces not corrode?

Answer:

Because orthodontic wires are positioned close to the oral mucosa for lengthy periods, they should be resistant to corrosion and prevent the release of ions in the oral cavity, and should not cause allergic reactions. In other words, orthodontic wires must be biocompatible with oral tissues.

Question:

Oxidation

Answer:

Oxidation is any chemical reaction that involves the moving of electrons. ...When iron reacts with oxygen it forms a chemical called rust because it has been oxidized (the iron has lost some electrons) and the oxygen has been reduced (the oxygen has gained some electrons).

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Question:

Anode vs Cathode

Answer:

The anode of a device is the terminal where current flows in from outside. The cathode of a device is the terminal where current flows out. ... By current we mean the positive conventional current. Since electrons are negatively charged, positive current flowing in is the same as electrons flowing out.

Question:

Electrolyte

Answer:

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent.

Question:

Galvanic Corrosion

Answer:

Galvanic corrosion occurs when two different metals are in contact in a

corrosive environment: one of the metals experiences an accelerated

corrosion rate. The contacting metals form a bimetallic couple because of their different affinities (or attraction) for electrons.

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Question:

reduction

Answer:

Reduction is a chemical reaction that involves the gaining of electrons by one of the atoms involved in the reaction between two chemicals. The term refers to the element that accepts electrons, as the oxidation state of the element that gains electrons is lowered.

Question:

oxidation redox reaction

Answer:

An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion change by gaining or losing an electron.

Question:

Parts of Galvanic Cells

Answer:

• The anode is an electrode where oxidation occurs.
• The cathode is an electrode where reduction occurs.
• A salt bridge is a chamber of electrolytes necessary to complete the circuit

in a voltaic cell.

• The oxidation and reduction reactions are separated into compartments

called half-cells.

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