Fuel for Thought
This chemical process in plants utilises solar energy to synthesize glucose from carbon dioxide and water.
What is photosynthesis?
This specific electrode is defined as the site where oxidation always occurs in both galvanic and fuel cells.
What is the anode?
This feature in a mass spectrum represents the heaviest fragment peak, ignoring minor isotopic effects, and corresponds to the unfragmented radical cation.
What is the molecular ion peak?
This fundamental chemical guideline states that if a dynamic equilibrium system is subjected to a change in conditions, the system will shift to partially counteract that change.
What is Le Chatelier’s Principle?
Students frequently drop marks on electrochemical cell diagrams because they confuse the direction of electron flow in the external circuit with the migration path of these charged particles.
What are ions in the electrolyte?
Unlike fossil fuels, these energy resources are derived from organic matter over a short time frame and can be replenished at a rate equal to or faster than they are consumed.
What are biofuels?
This is the polarity assigned to the anode in an operating spontaneous galvanic cell.
What is negative (-)?
This broad, distinctive absorption profile sitting between 2500 and 3500 cm⁻¹ on an infrared spectrum signals the definite presence of this functional group.
What is a carboxylic acid (O-H stretch)?
This is the only physical variable that can alter the numerical value of a system's equilibrium constant (Kc)
What is temperature?
When writing thermochemical equations, failing to include these descriptive indicators beside every chemical formula will result in an immediate loss of marks.
What are states of matter?
This is the energy that is typically available for the body to use as a result of the digestion of proteins, according to the VCE Data Book.
What is 17 kJ g⁻¹?
In a standard hydrogen-oxygen fuel cell operating with an acidic electrolyte, this chemical species acts as the internal charge carrier migrating through the membrane.
What is the hydrogen ion (H⁺ or hydronium ion)?
A molecule with the formula C₃H₆O displays exactly two sharp environment signals on its ¹³C NMR spectrum due to this structural attribute.
What is molecular symmetry?
For an exothermic forward reaction, this happens to the final value of Kc if the system's temperature is raised.
What is it decreases?
When evaluating a ¹H NMR peak, students often incorrectly assume the integration value reveals the splitting pattern, rather than indicating this specific value.
What is the ratio of hydrogen atoms (or protons) in that specific environment?
This structural difference explains why amylopectin dissolves more easily in water and is digested faster than amylose.
What is its highly branched structure?
This is the theoretical cell voltage (E°) generated by a galvanic cell constructed from a Cu²⁺/Cu half-cell and a Ni²⁺/Ni half-cell.
What is +0.57 V?
This is the splitting pattern observed for a proton environment whose immediately adjacent carbon atom is bonded to exactly three equivalent protons.
What is a quartet?
This metric is a core tenet of the 12 Principles of Green Chemistry and measures how much of the mass of the starting materials ends up in the useful target product.
What is atom economy?
When calculating the energy content of a combustion experiment using q=mcΔ T, students often mistakenly substitute the mass of the fuel being burned instead of this value for m.
What is the mass of the water being heated?
This industrial separation method must be used after fermentation when ethanol concentrations reach about 15%, leaving behind a highly aqueous solution.
What is fractional distillation?
This structural component is a critical feature of fuel cells that allows reactants to come into contact with the electrolyte while being continuously supplied.
What is a porous electrode?
These conditions in HPLC would cause a polar molecule to have a short retention time.
What is polar mobile phase and non-polar stationary phase?
Industrial plants frequently operate at a compromise temperature for exothermic processes for this dual kinetic and thermodynamic reason.
What is balancing a fast reaction rate against a high equilibrium yield?
This is the state of matter error commonly made when writing equations for cellular respiration under standard laboratory conditions, regarding the state of glucose.
What is aqueous (aq)?