Hi, may i have chem ? keep the answer as simple as possible.

what were the expected results of rutherford's gold foil experiment, based on thomson's model of the atom? how did the real results of the gold foil experiment change the accepted model of the atom?

Which metal exist in liquid state and can be cut with knife ?

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer