According to the equation below, what is the enthalpy change when 400.0 g of propane is burned in excess oxygen? c3h8 (g) + 5o2 (g) ) ↔ 3co2 (g) + 4h2o (l) δh = -2221kj

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Compare and contrast the bohr model and the electron cloud models of the atom.

Which metals are called noble metals