Which of the following is not an example of a chemical change? ice melting iron rusting steak cooking wood burning

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

Identify and describe the three ways that mutations affect organisms.