Why cant atoms of one element convert to another element?

When is the principle of conservation of mass true? A. Only for reactions that take place in open systems. B. Only for reactions that take place in closed systems. C. For reactions that involve solids, but not gases. D.

Which of the following have the most similar properties? A. Sodium (Na) and Magnesium (Mg) B. Carbon (C) and Silicon (Si) C. Argon (Ar) and Chlorine (Cl) D. Potassium (K) and Calcium (Ca)

The molar mass of iron (Fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?

Refusing to take part in sexual activity is called sexual abstinence? True or false.

Water has a density of 0.997 g/cm^3 at 25 degrees C; ice has a density of 0.917 g/cm^3 at - 10 degrees C. (question part a) If a soft drink bottle whose volume is 1.

Whitch unit is not a measurement of volume

List all of the species that would have a net attraction to the positive charge: CH4, CH2Cl2, H3O+, H2O, C2H2Cl2, CO2, N3-,

A certain organ pipe, open at both ends, produces a fundamental frequency of 272 HzHz in air. Part A If the pipe is filled with helium at the same temperature, what fundamental frequency fHefHef_He will it produce?

Between what two consecutive energy levels of a hydrogen atom is there the greatest change in energy?

Which SI unit indicates the mass on an average-sized box of breakfast cereal? A. kg B. lb C. g D. oz