The alkene CH3 CHCH CH2 CH3 is named 2-butene. It is a four-carbon alkene with a double bond between the second and third carbon atoms in the chain. The name "2-butene" indicates the position of the double bond in the carbon chain. **

835 silver refers to a type of silver alloy that contains 83.5% pure silver and 16.5% other metals, typically copper. This alloy is commonly used in jewelry and silverware, as the addition of other metals makes the silver more durable and less prone to tarnishing. 835 silver is slightly less pure than sterling silver, which contains 92.5% pure silver, but it is still considered high quality and is often used in the creation of beautiful and long-lasting pieces. **

The skeletal formula of CH3 is simply a line representing the carbon atom with three hydrogen atoms attached to it. This is a simplified way of representing organic molecules where carbon atoms are not explicitly shown, and only the bonds and other atoms are depicted. In the case of CH3, the carbon atom is assumed to be at the end of the line with three hydrogen atoms attached to it. **

CH3 and H3C both represent a methyl group in organic chemistry, but the difference lies in the way they are written. CH3 is written with the carbon atom first, followed by the hydrogen atoms, while H3C is written with the hydrogen atoms first, followed by the carbon atom. Despite this difference in notation, both CH3 and H3C represent the same functional group in organic molecules. **

835 rj in silver refers to the purity of the silver. The number 835 indicates that the silver is 83.5% pure, which is commonly used in European countries for silver jewelry and other items. The "rj" may refer to a specific hallmark or maker's mark associated with the silver piece. Overall, 835 rj signifies a high level of silver purity and quality. **

The manufacturer of 835 silver is not a specific company, but rather a standard used to indicate the silver content in an alloy. 835 silver refers to a silver alloy that contains 83.5% pure silver and 16.5% other metals, typically copper. This standard is commonly used in European countries and is often marked with a hallmark or stamp to indicate its purity. Therefore, there is no single manufacturer of 835 silver, as it is a standard used by various silverware and jewelry makers. **

Certainly! Could you please provide more context or specify what you would like to have explained? This will help me understand what you are referring to and provide a more accurate explanation. **

I'm sorry, but as a language model AI, I cannot physically repair any devices. However, I can provide you with some general troubleshooting tips or guide you on how to find a professional repair service for your Siemens Club 835 cassette recorder. **