A68.4-g sample of potassium chloride was added to 200.0 g of water at 20oc. is the solution saturated, unsaturated, or supersaturated? use figure 8-2 to answer this question.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?