White powder, when heated, produces a colourless gas and a black solid. Is the white powder and element?

Which acid has the formula hno2? hydronitric acid hydronitrous acid nitric acid nitrous acid hydornitridic acid

Consider the spontaneous dissolution of NaCl in water: NaCl (s) → Na + (aq) + Cl - (aq) Predict whether the entropy change for this process is positive or negative and explain your answer.

When a compound donates (loses) electrons, that compound becomes oxidized. Such a compound is often referred to as an electron donor?

Which pair of atoms has the highest electronegativity difference? A. H-S B. H-CI C. N-H D. O-H E. C-H

Write a hypothesis to describe The relationship between earthquakes and tsunamis

The equation A + BX ® AX + B is the general equation for a a. double-replacement reaction. c. replacement reaction. b. decomposition reaction. d. combustion reaction.

he Food and Drug Administration (FDA) mandates that all vinegar sold in the United States must have a minimum concentration of 4% acetic acid by mass. Calculate the minimum molarity of acetic acid in vinegar according to this standard.

Which of the following is a postulate of the kinetic-molecular theory? A. Gases are made up of particles that act like small, soft spheres that are always moving in a calculated fashion. B.

An atom's outermost electron arrangement determines how it interacts with other atoms. Which of the following atomic structures would be most likely to form an ionic bond? A. neon, which has eight outer electrons B.

The main acid in the stomach is hydrochloric acid (HCl). Which chemical equations show a reaction that occurs when someone takes an antacid? Check all that apply.