Use the data you've recorded from the previous activity to arrange the rock layers from oldest to youngest on the
geologic time scale. Determine the identity of the unknown fossil by using the Fossils chart.
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TOOLS
Paleozoic Era
433 417
359
542
490
299
250
+
+
million
years ago
Basalt
Limestone with
un nown fossi
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Sandstone with
trilobite
Shale with
ammonite
Check PLS HURRY

it is the most commonly accepted one

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o