A perennial nitrogen-fixing plant is a type of plant that has the ability to take nitrogen from the air and convert it into a form that can be used by other plants. These plants have a symbiotic relationship with nitrogen-fixing bacteria that live in nodules on their roots. By fixing nitrogen, these plants help to improve soil fertility and overall plant health, making them valuable additions to sustainable gardening and farming practices. Some common examples of perennial nitrogen-fixing plants include legumes like clover, alfalfa, and beans. **

Fixing powder is a cosmetic product used to set makeup in place and help it last longer. It is typically a translucent or tinted powder that is applied over foundation and other makeup to absorb excess oil, reduce shine, and create a smooth, matte finish. Fixing powder can also help blur imperfections and fine lines, giving the skin a more polished look. **

Price-fixing agreements are illegal arrangements between competitors to set the price of a product or service at an agreed-upon level, rather than allowing market forces to determine the price. These agreements are a violation of antitrust laws because they restrict competition and can lead to higher prices for consumers. Price-fixing agreements can take various forms, such as setting minimum or maximum prices, dividing markets, or coordinating bids in a way that undermines the competitive process. Authorities actively investigate and prosecute price-fixing agreements to protect consumers and ensure fair competition in the marketplace. **

No, nitrogen dioxide (NO2) does not separate at normal sun to form oxygen (O2) and nitrogen (N2). Nitrogen dioxide is a brownish gas that is formed from the reaction of nitrogen and oxygen in the atmosphere. It does not naturally separate into its constituent elements under normal sunlight. However, nitrogen dioxide can be broken down into oxygen and nitrogen through a process called photodissociation, which occurs at higher energy levels such as in the upper atmosphere or during lightning strikes. **

No, nitrogen itself does not burn. Nitrogen is a non-flammable gas and does not support combustion. **

Nitrogen is primarily found in the Earth's atmosphere, making up about 78% of the air we breathe. It is created through a process called nitrogen fixation, where certain bacteria and other organisms convert nitrogen gas into a form that plants can use. Additionally, nitrogen can also be released into the environment through human activities such as the burning of fossil fuels and the use of nitrogen-based fertilizers in agriculture. **

Fixing salt, also known as sodium thiosulfate, can typically be found at photography supply stores, chemical supply stores, or online retailers that specialize in photographic chemicals. It is commonly used in the process of fixing photographic prints to remove any remaining traces of undeveloped silver halide. Make sure to follow safety guidelines when handling fixing salt, as it can be harmful if not used properly. **

Nitrogen and oxygen react to form nitrogen dioxide through a process called oxidation. When nitrogen and oxygen come into contact at high temperatures, such as during combustion or lightning strikes, they combine to form nitrogen dioxide. This reaction is exothermic, meaning it releases heat energy. The balanced chemical equation for this reaction is 2N2 + 2O2 → 2NO2. **