Aluminium is a fairly reactive metal that often has a protective layer on due to oxidation

with air. This means it sometimes seems reluctant to react. Name the protective layer.

Which of the following is not a way in which thermal energy is transferred? A:Conduction B:Convection C:Radiation D:Sublimation

In each cycle of a Carnot engine, 104 J of heat is absorbed from the high-temperature reservoir and 51 J is exhausted to the lowtemperature reservoir. What is the efficiency of the engine?

Consider the reaction B (s) + 32O2 (g) →B2O3 (s), ΔH = - 1270kJ What will ΔH be for the reaction if it is reversed? Express your answer with appropriate units.

Which process involves an increase in entropy? crystallization of a solute from a solution ice melting into liquid water iodine vapor forming solid iodine condensing a gas into a liquid?

How to first ionization energies vary within groups and across periods

Consider the reaction pathway graph below which indicates the energy that must be absorbed to initiate the reaction

Which statement best explains why a metal atom and a nonmetal atom are most likely to form an ionic bond? A.

What does a formation equation show

The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant. Deuterium, D, is an isotope of hydrogen. 2 HD (g) ⇌ H2 (g) + D2 (g) Kc = 0.

Which would not be classified as a pure substance?