Why aren't the atomic masses of most elements whole numbers

Which statement is true regarding weathering in dry environments?

A chemist determined by measurements that 0.050 moles of aluminum participated in a chemical reaction. Calculate the mass of aluminum that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.

What is the storage area for dna inside a cell?

What volume of 10.08 m hno3 is required to prepare 458 ml of a 1.6 m hno3 solution? answer in units of ml?

When ethane (C2H6) burns, it produces carbon dioxide and water: 2C2H6 (g) + 7O2 (g) - - > 4CO2 (g) + 6H2O (l) How many moles of water will be produced when 16 moles of ethane are burned? ? 48 moles ? 32 moles ? 56 moles ? 64 moles

What does the velocity of a wave describe

Sulfur (S) has 16 protons and 16 neutrons. How many electron shells does an element of sulfur have?

Which one of the following statements about orbital energies is incorrect? A) The energy of a given orbital increases as the nuclear charge Z increases. B) In many-electron atoms the energy of an orbital depends on both n and l.

When solid lead (II) sulfide ore burns in oxygen gas, the products are solid lead (II) oxide and sulfur dioxide gas.? A. write the balanced equation B. how many grams of oxygen are required to react with 29.9 grams of lead II sulfide? C.

What are some differences between insect larvae and worms?