How many moles of tin atoms are there in 250 grams of tin?

List the number of protons, neutrons, and electrons in Iodine-127. (atomic number is 53)

What does 599 ±746*13612

Define element and compound. explain the difference between an element and a compound.

What volume of concentrated nitric acid (15.0M) is requiredfor the preperation of 2.00 L of 0.001 M nitric acidsolution.

What is the ion in acids that determines if they are safe to eat? I need an answer but I can't give anything because i don't know how

Air is transferred from a 75 L tank where the pressure is 125 psi and the temperture is 288 k to a tire with a volume of 6.1 L and a pressure of 25 psi. What is the new temperture.

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.