Which formula can represent hydrogen ions in an aqueous solution?

OH - (aq)

Hg2^2 + (aq)

H30 + (aq)

NH + (aq)

A gas occupies 4.23 l at 2.25 atm. what is the volume at 3.46 atm?

Express the value of exactly 15 centimeters to three significant figures.

Given the parent compound, draw the mass spectrum fragment that is observed at m/z 91. Include any hydrogen atoms and the charge.

Give the quantum number set for one electron in the 3p sublevel of a sulfur (S) atom.

1. Balance the chemical reaction for the production of hydrogen cyanide: __ NH3 (g) + __ O2 (g) + __ CH4 (g) → __ HCN (g) + __ H2O (g) (Hint: none of the coefficients are larger than 6) 2. Using the balanced equation in question 1, if 25.

Rearrange in to a quadratic 5.333 = (0.6 + 2p) ² / (0.135 - p)

How hot would a 2.3 L balloon have to get to expand to a volume of 3.0 L? Assume the initial temperature of the balloon is 24 °C, and that the pressure inside the balloon remains constant. A. 3 K B. 42 K C. 128 K D. 390 K

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine

Most meteors that fall into the earths atmosphere burn up before reaching the ground. Why is this?

Imagine a chemist is in the lab and trying to make some chemical reactions happen. In one reaction she reacts chemicals in an exothermic reaction and there is an increase in entropy.