Pls help with this questions Asap Explain what observations you would need to make in order to determine if a chemical or physical change occurred. ​

Predict the products butane (c4h10) + oxygen —>

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

What is the scientific name for weight?