Answer:
1. What is a substance that CANNOT be chemically broken down into simpler substances?
2. What type of change is one that produces new substances like burning wood to make ashes or mixing mentos and coke. You can't get the wood or the mentos back.
3. What is a change from a solid directly to a gas
4. What is a change from a gas to a liquid
5. What are nonmetals in group 7A of the periodic table?
1. An element
2. Chemical change
3. sublimation
4. condensations
5. Halogens