Hydrogen is a gas at room temperature, and is the first element in the periodic table. It has the chemical symbol H, but is usually found as a diatomic molecule of H2. It reacts with oxygen to form water. Hydrogen is a colourless, odourless gas that burns and can form an explosive mixture with air. It is the least dense gas known to man. A jet of hydrogen burns in air with a very hot blue flame. Hydrogen is the most abundant element in the universe. It is found most abundantly on Earth in water, but can also be found in the atmosphere in very small amounts. When reactive metals like sodium come into contact with water Hydrogen gas is released. The test for hydrogen is that when a test tube containing hydrogen is placed near a flame it ignites with a “ squeaky Pop”. All metals above Hydrogen in the reactivity series react with acids to displace hydrogen. Hydrogen combines with nitrogen to form ammonia. Instructions for produsing hydrogen gaz:
After you have completed the first 3 steps of the scientific method, find a pair of goggles that fit snugly over your face. Wear them at all times until the instructor tells you otherwise.
Using the test tube holder, carefully lift a test tube and place it into a test tube rack and release.
Using the tongs, carefully select one piece of zinc metal (either the unprocessed zinc or processed zinc squares) and place it in your test tube.
Carry the test tube holder and tray with test tube back to your seat and place it on the table.
Return to lab supply area and VERY CAREFULLY pick up a small graduated cylinder with pipette inside. Pipette contains approximately 2 mL of 1 M hydrochloric acid. (Molarity is a measure of concentration of solutions and mixtures). Return to seat carefully.
Make and record observations of zinc metal and HCl acid individually. Only hold the test tube with test tube holder, never bare hands.
With test tube in the test tube rack, carefully lift the pipette containing the acid from the graduated cylinder and place the tip approximately 2 cm above the sample of zinc in the test tube. Gently squeeze until the majority of the HCl is in the test tube.
Place empty pipette back in graduated cylinder.
Using the test tube holder, lift the test tube up out of the rack. Be careful not to apply pressure to the holder, accidentally releasing the test tube.
Kneel down so you are at eye level while your partner holds the tube. Make and record observations. After your partner replaces the tube in the rack, trade places carefully. Continue to make detailed observations and trade places for several minutes. NEVER look directly down into a test tube.
After several minutes, make final observations about any new materials formed (if any) and place the test tube back in the rack. Take rack and test tube back to lab supply area. Transfer your test tube with test tube holder to designated “Used Supply” rack. In a separate trip, return pipette (inside of graduated cylinder) to lab supply area.
Wash your hands with soap and water and return to your seat.
Интерактивті тақта
Interactive
board
карточкалар
cards
карточкалар
cards
Сабақты бекіту
Assigning a lesson
1. Hydrogen is the most common element in the universe.
2. The main compound of hydrogen on our planet is water.
3. A large number of hydrogen atoms is included in the composition of substances that form living organisms.
4. The valence of hydrogen is 1.
5. Hydrogen gas has the lowest molecular weight among all substances.
6. Hydrogen gas is highly soluble in water.
7. Hydrogen mixed with oxygen is explosive.
8. To collect hydrogen, the tube must be kept with the hole up.
9. The chemical activity of hydrogen is low.
10. Hydrogen compounds with metals are called hydrides.
11. In the laboratory, hydrogen is produced by the action of chloric acid on zinc.
12. The main directions of industrial use of hydrogen - the synthesis of ammonia, hydrogen chloride.
Сабақты бекіту кезінде:
https://www.youtube.com/watch?v=U-MNKK20Z_g , watch this video and fill the blank
Key words: Gas, first, H, H2, Oxygen, water, colourless ,sodium, Pop, released, small,metals, Earth, water, odourless, least, hot blue
Hydrogen is a _________at room temperature, and is the ___________element in the periodic table. It has the chemical symbol_____, but is usually found as a diatomic molecule of ________.
It reacts with______ to form ______. Hydrogen is a,_________,__________ gas that burns and can form an explosive mixture with air. It is the _______ dense gas known to man. A jet of hydrogen burns in air with a very _______ flame.
Hydrogen is the most ________element in the universe. It is found most abundantly on________ in________, but can also be found in the atmosphere in very small amounts. When reactive metals like ________come into contact with water Hydrogen gas is_________.
The test for hydrogen is that when a test tube containing hydrogen is placed near a flame it ignites with a “ squeaky”________. All metals above Hydrogen in the reactivity series react with acids to displace hydrogen. Hydrogen combines with nitrogen to form ammonia. Please wirte chemical equation of this reaction:
