1. Two groups test an unknown solution. It reacts with copper sulfate, copper bromide, gold chloride and bismuth chloride. Group 1 claims it could be silver nitrate. Group 2
says it is silver bromide. Who is right? Why?

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

може ли да зареждате повече информация, моля

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but