To understand the world we live in, we use mental models. What is the problem with mental models? (Select all that apply)

•They are personal

•They are incomplete

•They are idiosyncratic

•They are untestable

Which atom has the same number of neutrons as 12C? A. 9Be B. 11B C. 13C D. 14N

When seawater evaporates the concentration of salts increases until

Why is copper so widely sought on the world and new york mercantile exchange

Draw the structure (s) of all of the possible monochloro derivatives of 2,4-dimethylpentane, c7h15cl.

H2SO4 + 2 NH4OH - -> (NH4) 2SO4 + 2 HOH is a neutralization reaction between an acid and a base. Which substance is the salt?

Condensation requires? a) the removal of energy b) the absorption of energy. c) no energy change.

What is the species that determines the ph of a solution?

Echoderms contain a what similar to the kind that vertebrates have

Study the following unbalanced redox reaction. Which one of the following choices represents the balanced redox equation? PbS + O2→ PbO + SO2 PbS + 2O2→ PbO + 2SO2 2PbS + 2O2→ 2PbO + 2SO2 2PbS + 3O2→ 2PbO + 2SO2 3PbS + 3O2→ 2PbO + 2SO2

Arrange these gases in order of decreasing standard molar entropy: Rank from largest to smallest. Kr, Cl2, SO3