10.0 g of CuCl 2 is combined with 8.0 g of NaOH , which reactant will be in excess?

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?

How much energy is required to vaporize 2 kg of copper? a 4730 kj b 207kj c 9460 kj d 414kj

Which characteristics affect ocean water’s temperature? check all that apply. depth location mass salinity waves