1. Heat the white sugar in the pot until it turns black, and taste whether the black substance is sweet or not? 2. Take desiccant bag, add tap water and test its temperature change? 3. Take rust iron nail and white vinegar reaction 4. Take the polished nails and white vinegar to reflect 5. Take the outer metal skin of the battery and white vinegar to reflect 6. Add water to the battery contents, soak garlic, and test its germination, which is different from that of water 7. Take alkali surface and add white vinegar for reaction 8. Take different petal juice, add white vinegar and alkaline water to react

1. Heat the white sugar in the pot until it turns black, and taste whether the black substance is sweet or not? 2. Take desiccant bag, add tap water and test its temperature change? 3. Take rust iron nail and white vinegar reaction 4. Take the polished nails and white vinegar to reflect 5. Take the outer metal skin of the battery and white vinegar to reflect 6. Add water to the battery contents, soak garlic, and test its germination, which is different from that of water 7. Take alkali surface and add white vinegar for reaction 8. Take different petal juice, add white vinegar and alkaline water to react

1. There is no sweet taste, because the black substance is carbon
When the temperature rises, the desiccant will release heat when it dissolves in water
3. Rust will slowly disappear, because the main components of rust can react with the main components of vinegar
4. There are bubbles on the surface of nails
5. Produce bubbles, the metal skin is zinc
6. The content of the battery contains nitrogen, which should grow better
7. Produce colorless bubbles
8. Petals will change color. Some petals can show different colors when they meet acid and alkali, such as litmus

How to adjust the lever balance in the experiment
Is it how to adjust the balance after the hook code is hung on the left and right ends, or use the balance nut?

Before there is no hook code, adjust the balance nut of lever ruler,
After hanging the hook code, adjust the position or number of hook code, but keep the relationship of F1 * L1 = F2 * L2 to balance
If there is no balance, it is an experimental error!