Conservation of mass

1. In science class, Leo asks: When you mix salt and sugar in a bowl on a scale, does the total mass change?

   • Yes
   • It gets smaller
   • No (right)

2. In science class, Kai asks: A student evaporates water from a beaker. Does the total mass change?

   • Yes, because water turns to vapor and leaves
   • No (right)
   • Yes, the container gets lighter

3. Hana and Ana are curious. If you burn a piece of paper, does the total mass change?

   • Yes, ash is heavier than paper
   • Yes, it gets lighter
   • No (right)

Tip: Mass stays the same when matter changes form or reacts—unless something leaves the system like gas or water vapor.