Element used to make first atomic bomb

The enthalpy of formation of water is - 285.8 kJ/mol. What can be inferred from this statement? A. The enthalpy of the products is equal to the enthalpy of the reactants. B. Heat is absorbed during the process. C. Heat is released during the process.

How many kJ of energy must be removed from 53.1 g of liquid water in order for it to form ice?

Can anyone tell me 5 things that would happen if we didn't have helium?

In the balanced redox reaction 2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) 80.0 mL of 2.0 M HCl would (theoretically) react with how many grams of Al (s) ? Assume that the reaction is quantitative. A. 1.44 g B. 4.32 g C. 1,440 g D. 2,030 g E.

If an atom has 14 protons, 12 neutrons, and 18 electrons, what is the atom's electrical charge? a. - 4 b. 4 c. 6 d. - 6

How will you know whether a solution is saturated or supersaturated?

What is the number of moles of 27.6g of lithium?

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)