Seated Leg Press And Butt

elephant toothpaste

In this lab we will remember as much volume as the use of the scale. We will also check the decomposition of hydrogen peroxide (H 2 or 2), catalyzed by potassium iodide (KI). The decomposition of hydrogen peroxide is:
2H 2 O 2 (aq) -> 2H 2 O (l) + O 2 (g)

potassium iodide (KI) is a catalyst because it only increases the reaction rate is not spent as a reagent. However, a small part if it reacts, becoming iodine. The presence of iodine is shown by the brown color in parts of the product. The iodine stain. The reaction is performed in a graduated cylinder rather high, since the product formed vertically upwards and out quickly. That and its texture is called "toothpaste." As hydrogen peroxide is a very strong oxidizer must protect hands with gloves. In addition, the reaction is very fast, it is advisable to wear safety goggles. MATERIAL




graduated cylinder 250 ml, 100 ml graduated cylinder, glass clock, scales, gloves, safety glasses, protective plastic (optional), Chip (optional).
Products:
coloring (optional), liquid detergent (preferably white and pH = 7), hydrogen peroxide (H202) 30% potassium iodide (KI).




PROCEDURE 1. Put the plastic on the table to prevent staining.
2. Weighing in the watch glass 15 g of potassium iodide (KI) and put them in the absorber.
3. Add the minimum amount of water needed to dissolve. Shake until dissolved completely.
4. Put on rubber gloves and measures 40 ml of 30% hydrogen peroxide in 100 ml graduated cylinder and pour into the cylinder of 250 ml.
5. Add about 20 ml of liquid detergent and removed (by swirling) until the hydrogen peroxide and detergent mix.
6. If you like, add a little coloring in some parts of the mouth of the specimen so that the leaves striped toothpaste.
7. Add the potassium iodide solution to the tube and hand away quickly. Stand back a little of the specimen.
8. You can bring a stick fire to the mouth of the tube and see what happens.

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HYDROGEN


Today I will speak of hydrogen and a practice we do from this item. Hydrogen is a colorless, odorless tasteless. Like most gaseous elements, hydrogen is diatomic molecules containing two atoms (H 2 ), but dissociates into free atoms at high temperatures. There are three known isotopes of hydrogen. The nucleus of each ordinary hydrogen atom contains a single proton. Deuterium (about 0.02% in natural hydrogen) contains one proton and one neutron in the nucleus, with atomic mass of two. Tritium (a radioactive isotope unstable) contains one proton and two neutrons in the nucleus and has an atomic mass of tres.A ordinary temperatures hydrogen is very reactive.

not react with oxygen at low temperatures, but it does so violently if the temperature rises above 700 º C or any solid catalyst such as palladium or platinum finely divided, yielding water as a product of this reaction. When hydrogen is mixed with air or oxygen is turned on, the mixture explodes to form H2O, as the reaction

H 2 + O 2 -> H 2 O

This property is used in the practical process to identify the gas produced as hydrogen. Acts as a reducing agent for metal oxides such as copper oxide, removing the oxygen and leaving the metal free state. Hydrogen can combine with oxygen from oxides of other elements and reducing this character is used in metallurgy for metals with a high degree of purity such as tungsten filaments for electric lamps. Reacts with many non-metals. Combines with nitrogen in the presence of a catalyst to form ammonia NH3, with sulfur to form hydrogen sulfide H2S and chlorine to form hydrogen chloride, HCl. Also combined with more active metals like sodium, lithium and calcium, to form hydrides (NaH, LiH and CaH2). It also reacts with unsaturated organic compounds to form the corresponding saturated compounds.

There are many methods for obtaining hydrogen. Industrially it is usually obtained from water by electrolysis, or recovering from natural gas. In the laboratory, to obtain small amounts of hydrogen, zinc is usually treated with dilute hydrochloric acid, a process in which zinc chloride is formed and hydrogen follows: 2HCl + Zn

-> ZnCl 2 + H 2




hydrogen Globe

MATERIAL

beaker, filter flask, plug, globe, funnel, fine wire (1 meter), lighter, rod 1 meter sail.
Products:
Hydrochloric acid (HCl), granules of zinc or zinc powder, soap, glycerin.




PROCEDURE Enter settling tube a plug holes. Before, Rub with glycerin to keep from sticking. Enter
plug in the vacuum flask. Full
half the funnel with hydrochloric acid. Put the shot
zinc in the filter flask.
Place a balloon on the tube of the filter flask, tying with a rubber to prevent leakage. If the pressure is not strong enough, will not swell.
Under the supervision of your teacher, key opens the funnel with care, since it is dangerous.
When the balloon is inflated enough, tie it with thread. Notes that rises upwards. Ata
the candle to the stick. Turn it on.
Stand in an open and under the supervision of your teacher, about the candle to the globe and see what happens e.

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Chromatography is a separation technique based on the different mobility which have different solutes contained in the same solvent. The means by which they move is called stationary phase and the solvent through which solutes move is called the mobile phase. This solvent can be a gas or liquid, although we only deal with the mobile phase liquid chromatography and solid stationary phase. Practice we do on this occasion is:

Chromatography of spinach extract

MATERIAL

2 beakers, a square piece of cardboard used as a cover, filter paper , dropper, mortar.
Products:
Alcohol, sand, spinach.


PROCEDURE

Chop the spinach in a mortar with a little sand.
Add alcohol and stir until you see the color of spinach has absorbed the alcohol let it stand. Go
the solution to a beaker.
Prepare a filter paper strip 4 cm wide and 10 cm in length.
Fill the dropper with the solution of the dye of spinach.
Make a small spot about 4 cm from one end of the dropper on the strip of paper. Wait to dry the stain and repeat the process 3 or 4 times so that the stain is more concentrated.

Insert it into a beaker with alcohol 've previously covered with cardboard (1cm high alcohol) without stain touch the eluent.

After some time distinguish you a dark green line corresponds to chlorophyll b, the other light green of chlorophyll a, one more yellow xanthophyll orange and yellow carotenoids.

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MAGNESIUM


Magnesium is the least active of the alkali metals. It is ductile, malleable and, although white, is easily coated with a layer of white oxide (MgO) which gives the gray metal that we normally see. It is widely used by lightweight alloys for aircraft. Burns easily react with oxygen and nitrogen from the air, why is widely used in fireworks because it creates in the combustion a very intense white light of short wavelength.

Mg + O 2 -> MgO
3 Mg + N 2 -> Mg 3 N 2

We will conduct two practices relating to magnesium

Combustion of magnesium

MATERIAL

spatula, crucible tongs.
Products:
magnesium. PROCEDURE




Cut 2 cm of magnesium ribbon.
Please scratch this off with a spatula and examines the color and brightness that appears.
Turn it on with the help of crucible tongs.

reaction of magnesium with hydrochloric acid-2 MATERIAL



Crystallizer, gas tube, pipette bulb safety, watch glass.
Products:
Magnesium, concentrated hydrochloric acid.


PROCEDURE Put water

halfway into a crystallizer. Full
exhaust tube with water almost completely, and add 5 ml of concentrated hydrochloric acid (pour making sliding down the wall of the tube gases, fume cupboard and under the supervision of your teacher).

Finish filling the tube with water so that the meniscus beyond the edge of the tube, but not dripping.
cover the tube with the bottle, turn it over and insert it in the crystallizer so that it is as follows:
weighs 2 cm of magnesium ribbon and insert it quickly into the gas tube.
expected to complete the reaction and record the volume of gas evolved. Back
cap the gas pipe and remove it from the water. With the tube still blocked on a call and he removes the tube.
See what happens.