Chemistry-paper-chromatography

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Select all that apply about the scientific method.

a.

Involves observing the results of experiments.

b.

None of These

c.

Involves using others’ experimental data to make conclusions.

d.

Involves the testing of conclusions with additional experiments.

e.

Involves making conclusions about observations

Show ALL work using proper dimensional analysis as presented in class.

A sample in the lab was weighed on an analytical balance. The mass weighed was 1885.676 mg. Find the mass of the sample:

a.) In grams

b.) In micrograms

c.) In pounds.

What is the average atomic mass of Copper given the two Isotopes copper-63, which is present in 69.17% and copper-65, which is present in 30.83% of the copper atoms.

a.

63.05 amu

b.

63.55 amu

c.

64.00 amu

d.

64.55 amu

you understand it

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