Which phase changes are exothermic

Which of the following is not true about equilibrium reactions? a. An increase in pressure will decrease the volume. b. An increase in the concentration will increase the number of effective collisions. c.

When an atom gains an electron, the resulting particle is calledA) a proton. B) an anion. C) a cation. D) an isotope. E) none of the above

Hydrazine, n2h4, is used as a rocket fuel. in the reaction below, if 80.1 g of n2h4 and 92.0 g of n2o4 are allowed to react, how many grams of excess reactant remain at the end of the reaction?

Which of the following are NOT generally associated with convergent margins? A. fault-block mountains B. volcanic mountains C. thrust faulted mountains D. folded mountains

6.94) The combustion of what volume of ethane (C2H6), measured at 23.0°C and 752 mmHg, would be re- quired to heat 855 g of water from 25.0°C to 98.0°C?

Which of the following is the correct scientific notation for 0.000451 g? 4.5 x 10-3 4.5 x 10-5 4.51 x 10-4 45.1 x 10-4

A phase change from a solid to a gas is called what

What is hydrocarbon?

Why did most scientists reject Wegner's theory for nearly a half century?

Define prediction and explain how it is used to formulate a hypothesis.