AgNO3

Published April 14, 2018

AgNO3

An experience. Porcelain cup covered with two or three sheets of filter paper. Pour 1-2 g of AgNO3 crystals into a test tube and heat them in the flame of a gas burner or an alcohol lamp. At 218 degrees Celsius, the salt melts and turns into a pale greenish liquid. The melted AgNO3 drop by drop is poured onto the paper...

Nitric acid

Published April 14, 2018

Nitric acid

If you immerse the burned chips in nitric acid, then it burns vigorously. To demonstrate this experiment, a large test tube is anchored in the foot of the iron support, into which are poured a few milliliters of concentrated HNO3 with a density of 1,5. Such acid is usually obtained by distillation in a retort of sodium nitrate and concentrated sulfuric acid with a density of 1,84...

White powder of copper sulfate

Published April 14, 2018

White powder of copper sulfate

An experience. We put a white powder in a dry chemical beaker and show the spectators its color. Then pour a little hot water into the glass. The water is then colored blue. In order to obtain such an effect, it is necessary first to gently fry, stirring, the blue crystals of copper sulfate. In this case, they turn into white powder of copper sulfate. Interacting with water, the white powder turns blue again and forms...

"Volcano"

Published April 14, 2018

Volcano

An experience. In a porcelain mortar, 50 g of orange-red ammonium dichromate crystals are carefully ground. Powder (NH4)2Cr2O7 is poured onto a large metal plate or sheet of asbestos paper, the shape of the roller coaster - this will be our "volcano". At the top of the "volcano" a nail or a stick is made a funnel and poured into it 1-2 ml of ethyl alcohol...

The liquid boils... from sulfuric acid

Published April 14, 2018

The liquid boils... from sulfuric acid

Having conducted an interesting experience, you can see how the liquid boils... from sulfuric acid. In the beaker, drain the two cold liquids and put a test tube with water or alcohol into the glass. After a few minutes, the liquid in the test tube begins to boil. To conduct the experiment, in a thin-walled glass with a capacity of 0,5 L to 50 ml of cold water, add 200 ml of strong sulfuric acid and mix the test tube...

Properties of metals

Published April 14, 2018

Properties of metals

The vast majority of simple substances are metals. Physical properties of metals - it's opacity, specific "metallic" gloss, high thermal and electrical conductivity, and plasticity. It is thanks to these properties that metals played a decisive role in the history of mankind. What is the reason that metals have such properties and why are they so different from nonmetals? The periodic law and theory of atomic structure...

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