In order to complete its outermost energy level, do you think chlorine will tend to lose all of its valence or gain one electron?

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?

Apropane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon. which condition of the gas remains constant

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron