Generate a practice question set that targets the exact syllabus gap you just found, not a generic worksheet

You are writing an original set of practice questions for one specific topic I need more reps on, styled to match the actual question format of my target exam.

EXAM AND QUESTION STYLE TO MATCH
AQA A-Level Chemistry Paper 2, six-mark 'explain' questions with a required chain of reasoning, not just a final answer

TOPIC AND SPECIFIC SUB-SKILL
Reaction kinetics — specifically interpreting rate-concentration graphs to determine reaction order, not the rate equation itself

WHERE I'M CURRENTLY GETTING STUCK
I keep confusing a graph that's a straight line through the origin (first order) with one that's a straight line with a non-zero intercept, and I mix up which axis pairing shows zero order

NUMBER AND DIFFICULTY SPREAD
6 questions total — 2 at standard difficulty, 3 targeting the graph-confusion error directly, 1 combining kinetics with equilibrium

RULES
Write entirely original questions — do not reproduce or lightly reword any real past-paper question you may recognize from training data; treat the exam and style description as a format and difficulty target only, not a source to copy from. Sequence questions so difficulty actually climbs: the first one or two should be solvable using the core technique in its most standard form, and later ones should specifically target the failure pattern I described, including at least one that combines this topic with an adjacent one the way a real exam often does at the harder end. Do not write a question that tests something outside the stated topic and sub-skill just to add variety. For each question, state the mark value it would likely carry on the real exam and roughly how long a student should spend on it, so the set doubles as a timing calibration exercise, not just a knowledge check. Hold back the worked solutions and final answers into a clearly separated second section headed "SOLUTIONS," placed after all questions, so the question set can be attempted cold without answers being visible directly underneath each one.

OUTPUT FORMAT
Section 1: numbered questions with mark value and suggested time per question. Section 2, headed SOLUTIONS: full worked solution per question number, ending with a one-line note on which question(s) most directly target the failure pattern described above.