✨✨PLEASE HELP✨✨SCIENTIFIC NOTATION✨✨: 1. (6x10^3)(2x10^-5)(3x10^-1)
2. 4x10^5 / 2x10^3
3. 3x10^6 / 6x10^-3
4. (6x10^-4)(3x10^2)

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Explain what happens at the saturation point when adding salt to water at room temperature.

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.