Which event is endothermic?

a) the burning of a match

b) the change of water vapor to a liquid

c) the combustion of propane gas

d) the melting of ice

Suppose that the pressure of 0.66 L of gas is 424.9 mm Hg when the temperature is 261.2 K. At what temperature is the volume 7.63 L and the pressure 872.15 mm Hg? Select one: a. 6200 b. 1.24e4 c. 3010 d. 11.0

What is the molar mass of Cu2 (CrO4)

What makes the star Alpha Centauri appear to be yellow-white?

Is the following is a correct statement of Charless Law? The volume of a gas varies directly with the absolute temperature under the conditions of constant pressure.

If you have 9 bread, 5 meat, and 6 cheese. How many complete sandwiches will be made?

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.

What is the example to the word camouflage

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4

The mass flow rate of gasoline leaving a refinery is 1610 kg/min. The specific gravity of a gasoline is 0.700. A retail gasoline pump is able to fill a 20.0 gallon automobile tank in 1.80 minutes.