Which of the following would be a good situation in which to apply Hess's law?

A. when the reaction is exothermic

B. when the products are unknown

C. when a reaction is spontaneous

D. when the Hreaction is not known

One example of an ionic compound is F2 CO2 HBr MgCL2

How many oxygen atoms are present in a formula unit of sodium carbonate?

Why does increasing the pressure of a gas usually increase reaction rate? A. The increased pressure acts as a catalyst on the gas particles in the reaction. B. The gas particles are closer, which increases the number of collisions. C.

Explain the relationship between sugars (glucose) and starches (carbohydrates). Use the terms, monomer and polymer, in your explanation.

50. mL of water is initially 70. k and cooled to 25. k. What is the thermal energy?

The flame from my candle gives off black smoke heat and light what type of changes do these indicate

Which one of the following processes results in a decrease in the number of neutrons? corrosion electron capture gamma emission positron emission alpha emission

Calculate the root mean square velocity of F2, Cl2, and Br2 at 304 K.

The total pressure inside a 1.62 cylinder kept at 35°C is 1.15 atm. If the volume of the cylinder drops to 0.74 L and the temperature remains the same, what is the new pressure inside the cylinder?

What is difference between tempering and aging?