A monolayer (single layer of atoms) of Cu on the crystal face shown in the margin has 1.53 × 10^15 atoms/cm2 -

2.54 × 10^9 mol/cm2

. What current can deposit

one layer of Cu atoms on 1 cm2 in 1 s?⁹​

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Which type of fossil does this image depict?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.