Which direct measurement would provide evidence that the energy of a substance had changed?

A. Temperature

B. Heat

C. Mass

D. Volume

What volume of hydrogen gas is evolved from a reaction between 0.52 g of Na and water? This gas is collected at 20 C and 745mmHg

What is thr pH of a solution of NaCl that has [H+] = 1.00 * 10-7 M

What is the hydronium h3o + concentration of a solution with a pH pf 3

When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g).

In an exactly. 200M solution of benzoic acid, a monoprotic acid, the [H+] = 3.55 * 10-3M. What is the Ka for benzoic acid?

99pts! Which of the following best explains what happens when the kinetic energy of particles in a gas state decreases? They vibrate so quickly that the particles ionize and become plasma.

Which substance can act as an arrhenius base in an aqueous solution

What characteristic must be true of a good hypothesis

Which pair of atoms has the highest electronegativity difference? Na-F Ca-F H-F C-F F-F

How fast can a turbidite bed form? a matter of minutes a matter of seconds a matter of hours a matter of years