Which reaction is endothermic?

H2 (g) + ½ O2 (g) → H2O (g), ΔH = - 57.82 kcal

½N2 (g) + O2 (g) + 8.1 kcal → NO2 (g)

½N2 (g) + 3/2H2 (g) → NH3 (g) + 11.0 kcal

C (diamond) + O2 (g) → CO2, ΔH = - 94.50 kcal

In a chemical reaction reaction the number of molecules of a given substance is indicated by a

The light year is used to measure distances where

Andreas wrote the following hypothesis: "If the number of livestock on Earth increases, then the amount of methane gas in the atmosphere will increase because cows produce methane gas as a by-product of digestion.

What will happen if iron was heated in the air?

26 grams of CO2 to moles

A compound of material formed by a chemical is known as?

Which of these molecules experience london dispersion force?

What happens to the volume of most matter when it is heated?

An aqueous solution is made from a molecular compound rather than from an ionic compound. If some ions are present in solution, which best describes the solute? A. a weak electrolyte B. a nonelectrolyte C. a strong electrolyte D.

Which of the following measures the radiation given off by atoms per second?