Which allotrope of carbon is candidates the hardest material known

Using equation e = (hcrh) (1n2) = (-2.18*10-18j) (1n2), calculate the energy of an electron in the hydrogen atom when n = 6.

Which of the following best defines an acid? An acid has a pH of 7. An acid has hydroxide ions. An acid has fewer positive ions in solution. An acid has more hydrogen ions in solution.

The equilibrium constant, Kc, for the reaction H2 (g) + I2 (g) ⇄ 2HI (g) at 425°C is 54.8. A reaction vessel contains 0.0890 M HI, 0.215 M H2, and 0.498 M I2. Which statement is correct about this reaction mixture? a.

What are similarities between opinion based research and observation based research

What is a serial dilution?

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.

Assign the oxidation number for (NH4) 3PO4

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?

Do pure substances have the same chemical and physical properties

How is matter conserved in a chemical reaction