Which of the following would NOT indicate a chemical reaction is taking place? * (1 Point)
Magnesium burns and releases light
Lead (IT) lodide forms as a yellow precipitate in a reaction
Hydrogen gas is released in a reaction of a metal and an acid
Water vapor is released when water bolls

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?