Is tarnishing silver physical or chemical

In which type of reaction do two lighter nuclei combine to form one heavier nucleus? (1) combustion (3) nuclear fission (2) reduction (4) nuclear fusion

In a simple model of the Hydrogen atom, an electron moves in uniform circular motion with a speed of 2.2 x 106 m/s around a proton. (a) Determine the radius of the electron's orbit. (b) Find the centripetal acceleration of the electron in this orbit.

Suppose that 0.00150 moles of CO2 (44.0 g/mol) effuse out of a pinhole in 1.00 hour. How many moles of N2 (28.0 g/mol) would effuse out of the same pinhole in 1.00 hour? Assume both gases are at the same temperature and pressure.

How is chemistry used in body sytems

Determine both the formula mass and molar mass of ammonium carbonate, (nh4) 2co3

Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases.

The enthalpy of formation of MX is ΔHf° = - 525 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 139 kJ/mol. The ionization energy of M is IE = 437 kJ/mol. The electron affinity of X is ΔHEA = - 313 kJ/mol. (Refer to the hint).

Which group of elements could you not use in making fireworks?

A 5.0 M solution of HCL in water has a proton concentration of _M

How many moles are in 25.5 grams of Silver, Ag?