Worksheet 2020 PDF

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SECTION I. Multiple Choice Questions. (1 marks each) 1.

Which of the following is not a city in the Islamic empire in the year 900 AD. A. Athens B. Baghdad C. Damascus D. Alexandria E. Cordoba

2.

What two materials did Jabir used as his basis in his theory for metal A. Iron and water B. Mercury and sulphur C. Gold and silver D. Silver and sulphur E. Earth and water

3.

What is Georg Stahl famous for/associated with? A. First to synthesize an inorganic compound B. Formulation of the Phlogiston Theory C. Discoverer of Potassium D. Discoverer of Hydrogen E. One of the organizers of the Karlsruhe Chemical conference

4.

Which scientist wrote this: “I now mean by elements, as those chymists that speak plainest do by their principles, certain primitive and simple, or perfectly unmingled bodies; which not being made of any other bodies, or of one another, are the ingredients of which all those called perfectly mixt bodies are immediately compounded, and into which they are ultimately resolved” A. Joseph Priestley B. Henry Cavendish C. Antoine Lavoisier D. John Dalton E. Robert Boyle

5.

What does the ‘oxy’ in oxygen associated with? A. Acid B. Base C. Fire D. The Oxus river in central asia E. Oxeus, the town that the chemist who gave the name is born in

6.

In which historical event did Antoine Lavoisier die? A. Karlsruhe congress B. The bubonic plague C. Franco-German war D. French revolution E. American revolution

7.

According to Dalton’s binary principle, ammonia’s formula is NH. What would the value that Dalton would likely conclude as his atomic weight for nitrogen based on his gravimetric measurement of ammonia and its constituent? (Given that the current molecular weight of ammonia NH3 is 17, the atomic weight of hydrogen and nitrogen are 1 and 14, respectively) A. 1 B. 3 C. 5 D. 7 E. 14

8.

The discovery of the benzoyl radical in 1832 was seen as a support of which theory A. Dualism B. Organic C. Atomic D. Tria Prima E. Pneumatic

The next two questions are related to the figure below

9.

What best describes the object portrayed in the above figure? A. Battery B. Pneumatic Trough C. Guillotine D. Gasometer E. Calorimeter

10. Which chemist below used objects like those in the above question? A. Henry Cavendish B. Joseph Priestley C. Robert Boyle D. Antoine Lavoisier E. Humphry Davy The next three questions are related to the text below: …For substances which contain more atoms of carbon, it must be assumed that at least part of the atoms are held just by the affinity of carbon and that of carbon atoms themselves are joined together, so that naturally a part of the affinity for one for the other will bind an equally great part of the affinity of the other. The simplest, and therefore the most obvious, case of such linking together of two carbon atoms is this, that one affinity unit of one atom is bound to one of the other. Of the 2×4 affinity units of the two carbon atoms, two are thus used to hold both atoms themselves together… 11. Which of the following scientist is wrote the passage? A. B. C. D. E.

John Dalton Friedrich August Kekulé Joseph Louis Gay-Lussac Jean Baptiste André Dumas Humphry Davy

12. What best describe the term “affinity units” in the passage? A. B.

The part of the molecules that attract other molecules to initiate reactions Multiple atoms forming a ring structure

C. D. E.

The similarity between two atoms Linkages formed between two atoms Repulsion between two atoms

13. What did the scientist in the question above attribute to be his inspiration to his discovery of the self-linking of Carbon atoms to explain the chemical structures of organic compounds A. B. C. D. E.

A suspension bridge across the river Seine London omnibus Snake biting its own tail Shape of a floor tile London tower bridge

SECTION II. Answer the Questions Below by filling in the blank boxes. 1.

According to the Greek philosopher, Empedocles, what were the four ‘elements’ from which all matter can be derived? (2 marks)

2.

According to the Phlogiston theory, when metal is heated to give the metal calx, what happens (Use NOT more than 20 words)? (3 marks)

3.

A Prout is a unit of energy equivalent to the binding energy of a deuteron (A hydrogen isotope containing one proton and one neutron). State Prout’s hypothesis. (2 marks)

4.

In his 1853 paper, Charles Frédéric Gerhardt wrote that all organic compounds can be classified into four ‘types’: (a) Name the four types:

(2 marks) (b)

What ‘type’ does the alcohol methanol (CH3OH) belongs to? (1 marks)

(c)

5.

How should the alcohol methanol (CH3OH) be written in the notation of Gerhardt’s ‘Type Theory’? (1 marks)

How did the element helium gets its name?

(2 marks)...