How old is a fossil that has radioactivity decayed through 4 half-lives of carbon - 14?

What is the conversion of 85.0kg

For the equation N2 + 3H2 → 2NH3, if you start with 8 moles of nitrogen gas, how many moles of ammonia (NH3) will you have when the reaction is finished?

What nuclear symbol and hyphen notation for the isotope which has 26 protons and 30 neutrons?

Imagine that a rigid container is filled with a liquid, then closed and heated. What change would be observed? A) The liquid would expand. B) The liquid would change into a gas. C) The temperature of the liquid would not change.

50g of water is placed into a beaker. the mass of the beaker is now 115g. what is the mass of the empty beaker?

Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. using silica gel plates, which of the two compounds will have the higher rf value when ethyl acetate is the developing solvent?

Which model of election configuration is the most accurate? The quantum mechanical atomic model The Rutherford atomic model The Bohr atomic model O Plum pudding atomic model The quantum gravity atomic model

How is the rate of appearance of h2o related to the rate of disappearance of o2?

Occurs when the moon moves between the Earth and Sun and blocks the light

Why have some chemicals been banned from usage in agriculture/food production