ON TEACHING CHEMISTRY. 285 
COLLEGE OF PRECEPTORS, 
Incorporated by Royal Charter. 
Besides examining elementary schools this college undertakes to examine can- 
didates for the various professions, and its certificates are accepted as evidence of a 
sound general education, amongst other bodies, by the Incorporated Law Society, 
the Colleges of Physicians and Surgeons, and the Pharmaceutical Society. The 
rincipal Examination is known as the ‘ Professional Preliminary Examination.’ 
Seeetstry in this Examination, as well as in the Pupils’ Examination, is only an 
optional subject, and no practical work is set. No schedule of any kind is issued ; 
previous examination papers serve to guide both examiners and examinees, 
PROFESSIONAL PRELIMINARY EXAMINATION. 
CHEMISTRY. 
1. What is common salt? How is it decomposed by sulphuric acid? Show 
by symbols what are the products of its decomposition. 
2. To prepare cupric oxide, metallic copper is burnt; and to obtain water by 
synthesis, cupric oxide is heated in hydrogen. From 100 grams of copper how 
much cupric oxide can be obtained ; and how much water from the cupric oxide ? 
(H=1, O=16, Cu =63°3.) 
3. Define the terms ovidation, reduction, burning, chemical combination, de- 
composition, electrolysis, synthesis, analysis, and give examples, by equations or 
otherwise. 
4. From what compound is phosphorus obtained ? Show by equations how it 
is prepared, and how it combines with chlorine and oxygen. 
5. A gram of carbon is completely consumed ; what isthe product? How much 
does the product weigh, and what is approximately its volume at the normal 
pressure and temperature? (H=1; 1 litre of H weighs ‘0896 gr. at 0° and 760 
mm.;O0=16; andC=12.). ~ 
6. How is sulphuretted hydrogen prepared ? What is it used for? Is it 
combustible? if so, what are the products of its combustion? Is it respirable, 
soluble, coloured or colourless, lighter or heavier than air ? 
7. When horn, quills, or feathers are heated in a test-tube, a pungent gas, which 
turns red litmus blue, is evolved: how may it be prepared pure? What is its 
composition? What action has it upon hydrochloric and sulphuric acids? What 
is its chief source ? 
Purits’ EXAMINATION. 
CHEMISTRY. 
J. 
1. State precisely what you have seen take place when potassium and sodium 
abe been thrown into water, and give the equation expressing the chemical 
change. 
2. How can iron be made to decompose water? Give the equation for this 
decomposition. 
8. When sulphur burns in oxygen it does not increase the volume of the gas. 
What has become of the sulphur, and why is the volume unaltered ? 
4, There are 280 million tons of coal burnt in the world annually. What 
becomes of it ? 
5. Describe in words, and by equations if possible, two ways of making 
ammonia gas. Is the gas heavier or lighter than air? Is it incombustible or 
combustible? What action has it on blue and red litmus ? 
6. Complete the following equations :— 
H,S+Cl,= 
CaH,0, + Cl, = 
