about 5 years ago

An acid is a substance that _____.

A. Is a versatile solvent B. Contains hydrogen C. Reduces the hydrogen ion concentration of a solution D. Forms covalent bonds with other substances E. Increases the hydrogen ion concentration of an aqueous solution

kali

about 5 years ago

Chemical Principles

An ionic bond involves _____.

- A. An attraction between ions of opposite charge- B. Water avoidance- C. The sharing of a single pair of electrons- D. No atoms other than sodium and chlorine- E. The unequal sharing of an electron pair

shazli_1991

over 5 years ago

Chemical Principles

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-----> PCl3 (g)+ Cl2(g); Kc= 1.80 at 250 °C

A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.

gangadarr

over 5 years ago

Chemical Principles

What is the balanced chemical equation for the reaction used to calculate δH∘f of CaCO3(s)?

If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution.

ryangosling

over 5 years ago

Chemical Principles

Which of the following is not one of the body's chemical buffering systems?

- A) Phosphate- B) Bicarbonate- C) Hydrochloride- D) Hydrochloride, bicarbonate and phosphate are all buffering systems