What defines an exothermic reaction?

O A. A reaction that needs heat added

O B. A reaction that possesses enthalpy

O c. A reaction that relies on collisions

O D. A reaction that produces heat

42.5 grams of an unknown substance is heated to 105.0 degrees Celsius and then placed into a calorimeter containing 110.0 grams of water at 24.2 degrees Celsius. If the final temperature reached in the calorimeter is 32.

Two boxes are filled with air. The molecules that make up the air in Box A have more kinetic energy than those in Box B. What can you say about these boxes?

How many peanuts are contained in 19.34 grams of peanuts if one peanut has a mass of 0.0026 kg?

List the following units in order from largest to smallest: m3, mL, cL, uL, L, dL?

4fe (s) + 3o2 (g) →2fe2o3 (s) how many grams of Fe2O3 are produced when 12.0 of iron rusts

Why is photosynthesis so important to plants, and can't animals use it?

One way the government of Kim Jong-il controls the lives of the people who live in North Korea is by a. requiring every citizen to vote. b. controlling information its people receive from the outside world. c. enforcing free trade with other nations.

Give reasons 1) copper utensils and sheets become blackish after some days

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for? H and? S (for the system).

At 29°C, Kp = 5.3 ✕ 102 atm-2 for the following reaction. N2 (g) + 3 H2 (g) equilibrium reaction arrow 2 NH3 (g) When a certain partial pressure of NH3 (g) is put into an otherwise empty rigid vessel at 29°C, equilibrium is reached when 55.