How does a chemist know how much is "right" in a chemical reaction?

How many ml of 0.0500 m cacn2 are needed to make 25.0 ml of 0.0150 m solution? The molar mass of cacn2 is 80.11 g/mol.

How many joules of heat energy are released when 50.0g of water are cooled from 70.0C to 60.0C

Which molecule (s) contain peptide bond (-CONH - A - Glycogen B - Lipid C - Protein D - None of the above selection are correct

Comparing Prokaryotic and Eukaryotic Cells Which structures are common to both prokaryotic and eukaryotic cells? Check all that apply. vacuole cell membrane Golgi body ribosome cytoplasm endoplasmic reticulum

A covalent bond is formed by : - A) electron sharing between metals and non-metals. B) electron sharing between non-metals. C) electron transfer between non-metals. D) electron transfer from metals to non-metals.

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?

If two electrons have same number of protons but different number of neutrons can they be atoms of the same element?