A farmer clears an area of land, and erosion washes away much of the topsoil. The
farmer hopes to repair the damage and restore fertility to the soil with fertilizers.
Which of the following is a reason why this might NOT work?
a) Fertilizers will break down the organic matter that decomposes and releases
nutrients.
b) There are just some substances in topsoil that fertilizers cannot provide.
c) Fertilizers contain trace minerals that may be dangerous to the soil.
d) Fertilizers prevent helpful bacteria from aerating the soil.

1.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the mass defect of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 2.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 3.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy per nucleon of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o