What is the difference between food chains and food webs?

What’s a special glass that most beakers are made of

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.