Iwill try to mark brainliest!

which of the following is true about the mass of an object?

- it is equal to its weight
- it is proportional to its weight
- it is always more than its weight
- it changes at different location

It is proportional because gravity does not have affect on it. I tried to be quick

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.