mercy's car stopped at the middle of the road she found out that her car ran out of fuel. which compound must she buy?​

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

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?