A gas occupies a volume of 50.0 mL at 27C and 630 mmHg. At what temperature, in C, would the pressure be 101.3 kPa if the volume remains constant?

Amixture with the same composition throughout is!

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?

What is a number added in front of a formula in order to balance the equation