When trying to clean muddy, dirty river water, which method would work best?
chromatography
filtration
magnetism
distillation

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?

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.