Please help! This is important! This is worth 15 points! I’ll mark first answer brainliest!

List four observations that indicate that a chemical reaction may be taking place

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.