The method is as follows:
1. Add three quarters of water to a glass with a diameter of 7.5 cm.
2. Add a spoonful of salt to the water. Salt can help conduct electricity (although chlorine gas is produced during electrolysis due to the addition of chloride, as long as the current is not very large, the amount of gas impurities will not be important).
3. Cover the glass with cardboard. Then insert two wires 30 to 60 cm long onto the cardboard spaced about 5 cm apart, and let the part of the wires 5 to 7 cm long be immersed in the water.
4. Connect the other end of the wire to the positive and negative poles of the 9-volt power supply. Soon you will see bubbles forming near the wire in the water, hydrogen is produced at the negative electrode and oxygen is produced at the positive electrode.
5. If you want to prepare a large quantity of hydrogen or oxygen, you can effectComplete the following steps as appropriate, otherwise just skip to step 5. You will need a small container (a syringe is best) and something to hold the container upside down (usually tape).
6.Immerse the small container in the glass. Do not take the small cup out of the water or place the mouth of the small cup upwards, but turn the small container over so that the mouth of the small container contacts the bottom of the large cup ( if you use a syringe). , simply insert the small opening at the front of the syringe into the water, then remove the center stem, fill it with water, then go straight to step 9).
7. Slowly pull the small cup up, but don't let the water out. The end effect is that the small cup protrudes above the water and is filled with water (the pressure causes the water to stay inside the small cup).
8. Use tape, pliers,etc. to fix the small cup.
9. Insert the positive and negative poles of the wire into the small container.
10. When the small container is filled with gas, it can be removed.
Safety: Since the battery is used for electrolysis, the current is low and relatively safe, allowing children to try the operation.
The simple content of the video and production of small technology production is as follows:
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1. Steamboat Model: Use discarded materials such as plastic bottles, cardboard, and glue to create a simple steamboat model. First, plastic bottles are used to make the hull, then cardboard to make the paddles and rudders, and finally the steamboat is propelled by heating water to generate steam.
2. Small generator: using copper wire, magnetsnts and magnetic coils, you can make a simple small generator. Copper wire is wound around a magnetic coil and placed over the magnet. When the magnetic coil rotates, an electric current is generated, thereby generating electricity.
3. Solar Panel Model: Using small solar panels and LED lights, you can create a simple model of a solar power generation system. Connect the solar panel to the LED light and when sunlight hits the solar panel, the LED light will turn on.
4. Paper Airplane Design: Making paper airplanes is a simple and interesting little technology production project. You can use a piece of paper and fold it in a specific way to design different types of paper airplanes. Try different designs and key adjustments to see which design flies further or is more stable.
5. Water rocket experiment : Using discarded plastic bottles and compressed air, you can make a simple water rocket. Pour water into the plastic bottle, then quickly turn the bottle upside down and place it on the floor. Use a compressed air pump or tank to inject compressed air into the bottle. When the pressure builds up to a certain level, the water rocket will be ejected at high speed.
Technical craft skills:
1. Planning and preparation: Before you start directing, make sure you have a clear plan. Be clear about the project you want to complete and make a list of the materials and tools needed. This avoids surprises or interruptions during production.
2. Safety First: Always prioritize safety during any experiment or production process. Make sure you understand the potential risks of the materials andt the tools you use and take appropriate protective measures, such as wearing gloves, glasses, etc.
3. Care and Precision: Technology production typically requires precise measuring and assembly. When making cuts, welds or connections, be sure to measure carefully and use the correct tools to ensure accuracy.
4. Testing and adjustment: Technology production is a process of constant testing and adjustment. Don't get discouraged if your project doesn't work or doesn't work well. Try different methods and adjust settings to find the best solution.
5. Recording and Reflection: During the production process, remember to record each step and the results of the experiment. This can help you better understand and review your experiences and make improvements to future productions.