Athens Academy Islamabad · Unit Model Paper · Chemistry Grade 9

Part A Multiple Choice Questions 10 marks

Prepare this part on the portal

Part A is not printed here. Multiple-choice practice for this unit lives on the Athens portal, where it is marked instantly and you can repeat it as often as you like. Work through it in this order:

Unit MCQs — full bank. Every objective question for Unit 1. Work through it untimed and read each explanation, especially where you were wrong.
Online Quiz — timed self-test. Same standard as the board paper, against the clock. Aim to finish comfortably inside the time.
Flashcards. Use these in the last week for the five key terms, the six branches, the four exceptions, and the three STE definitions.

Part B Short Questions 20 marks

Attempt any ten of the following twelve questions. Each question carries 2 marks. A gold star (★) marks a question that appears in the board paper year after year.

★ 1. Define chemistry. Your definition must contain all five key terms. SLO CH-09-01 2

★ 2. State the four exceptions to organic chemistry — including the two oxides

\mathrm{CO_2}

and

\mathrm{CO}

— and explain why they are classed as inorganic. SLO CH-09-02 2

★ 3. Define organic chemistry and give two safe examples with their formulae. SLO CH-09-02 2

★ 4. Differentiate between physical chemistry and analytical chemistry. SLO CH-09-02 2

★ 5. Biochemistry is often mistaken for a branch of biology. State which subject it actually belongs to, and define it. SLO CH-09-02 2

★ 6. Define science, naming the four stages through which knowledge is constructed. SLO CH-09-03 2

★ 7. Distinguish between technology and engineering. Give the question each one answers. SLO CH-09-03 2

★ 8. Name any four branches of chemistry beyond the main six, and state in one phrase what each one studies. SLO CH-09-02 2

★ 9. Give one daily-life application of inorganic chemistry together with a Pakistani example. SLO CH-09-04 2

★ 10. State the two substances that rusting requires, and name the substance we actually see as rust. SLO CH-09-05 2

★ 11. Distinguish between the photovoltaic effect and the photoelectric effect, and state which one a solar cell uses. SLO CH-09-05 2

★ 12. Name the three stages of water purification in the correct order, and state what each stage removes. SLO CH-09-05 2

Part C Long Questions 30 marks

Attempt any two of the following four questions. Each question carries 15 marks. Spend no more than 15 minutes on each.

★ 1. The six branches of chemistry.

(a)Define all six branches of chemistry. Each definition must state what the branch studies and any scope or exception that applies to it.9
(b)For any three of those branches, give one daily-life application together with a Pakistani example.6

★ 2. Science, technology and engineering.

(a)Define science, technology and engineering separately, using the approved wording.6
(b)Draw a Venn diagram of the three, labelling all seven regions. One mark is awarded for each correctly labelled region.7
(c)State the key question that each of the three answers.2

★ 3. Applying the framework: rusting and solar energy.

(a)Write the equation summarising the oxidation of iron, with state symbols, and name the hydrated product we see as rust. State clearly what rusting requires.5
(b)Set out the roles of science, technology and engineering in tackling rust — as three separate sentences.4
(c)Explain how a solar cell works, naming the effect it uses, then give the three roles for solar energy and name one Pakistani installation.6

★ 4. Applying the framework: water and plastics.

(a)Describe the three stages of a water filtration system, then give the science, technology and engineering roles separately.8
(b)Explain how polyethylene is formed from its monomer ethylene, $\mathrm{C_2H_4}$ , by addition polymerisation, and give the three roles for plastic production.7

Part D Board Marking Pattern Reference

How this paper is structured, and how the marks are allocated.

Section	Attempt	Marks
Part A — Multiple choice	All 10 questions · 1 mark each · no choice	10
Part B — Short questions	Any 10 of 12 · 2 marks each	20
Part C — Long questions	Any 2 of 4 · 15 marks each	30
Total	—	60

How marks are actually awarded. Definitions are marked term by term — the examiner looks for composition, structure, properties, behaviour, changes in the chemistry definition, and systematic and knowledge in the science definition, so write them word for word. In every question on science, technology and engineering, each of the three roles carries its own mark; merging two roles into one sentence loses one of them. On the Venn diagram, each correctly labelled region earns a mark, and untidy circles cost nothing. In any organic chemistry question, the four exceptions must appear in your definition and must never appear among your examples.

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