An Introduction to Chemical Science

Obtain

weight of pure powdered manganese dioxide (MnO2). Put the mixture into a t.t., and insert a d.t.-delivery-tub

ig

f each with a glass plate, invert it with its mouth under water, and put it on the shelf of the trough, removing the plate. No air should be in the bottles. Ha

. is filled with air: allow this to escape for a few seconds; then move a receiver over the orifice, and fill it with gas. As soon as the lamp is taken away, remove the

ig. 8), with little or no water inside. When cool, the t.t. may be cleaned with

of mixing the two? This could have been done at a sufficiently high temperature. Mu02 requires a much higher temperature for dissociation, i.e. separation into its

sium chlorate undergoe

te = Potassium C

= KCl

of the equation has the same number of atoms as the left. Has anything been lost or gained? What element has heat separated? D

ustion o

ut, and put in again while glowing. Is it re-kindled? Repeat till it will no longer burn. Is the gas a supporter of combustion? How did the combustion compa

supporter of combustion? Note that when C is burned with plenty of O, CO2 is always formed, and that no matter how great the conf

ustion o

it by holding in the flame, and then hold it in a receiver of O. Note the color and brightness of the flame, and compare with the same in the air. Also note the color and odor of the pr

stion of

r of O. Notice the combustion, the color of the flame and of the product. After removing, be sure to burn every bit of P by holding it in a flame, as it is liable to take fire if left. The product of the combustion is a union of what two elements? Is it a

bustion

will adhere to be set on fire by holding it in the flame again. Then at once dip it into a receiver of O with a little water in the bottom. The iron will burn w

? What per cent by weight of Fe in the compound? Multiply the fractional part by 100. What

at do you infer of the tendency o

Gas without Colo

ust, and oxidation of so many substances, and for conflagrations, great and small. New compounds are thusformed, of which O constitutes one factor. Water, H2O, is only a chemical union of O and H. Iron rust, Fe2O3 and H2O, is composed of O, Fe, and water. The burning of wood or of coal gives rise to carbon dioxide, CO2, and water. Decay of animal and vegetable matter is hastened by this all-pervadi

given above. It may be obtained from water (Experiment 38) and