This is what comes back.
Every paper is marked by hand. Here is one question from a Chemistry trial exam, marked the way yours will be.
In acidic solution, dichromate ions Cr2O72− are reduced to Cr3+. Write the balanced half-equation for this reduction.
Cr: +6 → +3, so 3e−
✓Atoms balanced correctly.
✓H+ and H2O right for acidic conditions.
×Two Cr, each gaining 3 electrons, so 6e−. Your charge is +9 on the left and +6 on the right.
Marker's note Your balancing is sound, this is an electron count, not a chemistry problem. Multiply the change per atom by the number of atoms, then check the total charge on each side. That check catches it every time.
Written feedback, not just a score.
- Where you lost marks. Most of your lost marks came from charge balancing, not from misunderstanding the reactions.
- What to drill. Equilibrium and stoichiometry are solid. Redox electron counting is not.
- Exam technique. You left Question 9 blank. Partial working earns partial marks.
Illustrative sample. Question, response and feedback are our own, written to show the format and depth of marking you receive. Predicted ATAR is included when you submit four or more subjects.
Find out where you actually stand.
$51.95 per subject. Marked and returned within 7 days, or your marking is free.
Integral Academics is an independent educational resource provider. These materials are original practice resources and are not affiliated with, endorsed by, or connected to the Victorian Curriculum and Assessment Authority (VCAA).