B6. How old is an object with a molar ratio of 15% bismuth-210 to 85% Thallium-206? A. 5 days B. 10 days C. 15 days D. 20 days

Are alchemy and chemistry the same

A scientist examining the periodic table sees that the element magnesium (Mg) has the atomic number of 12. Based on this knowledge, what does the scientist immediately know is true about magnesium atoms? Magnesium atoms have 12 protons.

HA and HB are two strong monobasic acids. 25.0cm3 of 6.0 moldm-3 HA is mixed with 45.0 cm of 3.0 moldm-HB. What is the H * (aq) concentration, in moldm-3, in the resulting solution? A 1.9. C 4.1 B 2.1. D 4.5

What Are three methods for measuring the volume of an object?

A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?

What is the volume, in L, of 0.691 moles of O_2 2? gas having a temperature of 66.1? C and pressure of 5.91 atm

How can the concept of density be used to differentiate between a genuine diamond and an imitation diamond

Why electrons present around the nucleus of an atom do not fall into the nucleus

The 4 main layers of the atmosphere are organized according to what?

Which layer of soil in the diagram contains clay and other particles of rock but little humus?