Gasoline has an octane number of 70.

What is the percent isooctane to the percent heptane in this sample of gasoline?

The ideal gas law equation is PV = nRT. If n, R, and T are kept constant, what happens to the volume if pressure is increased? A) The volume increases B) The volume decreases C) The volume remains unchanged D) The temperature rises

The original atmosphere of earth had little oxygen. what was the likely first source of oxygen that led to an oxygen atmosphere?

When a solution labeled 0.50 m hno3 is diluted with water to give 0.25 m hno3, what happens to the number of moles of hno3 in the new solution?

Which elements combine by forming an ionic bond A) Sodium and potassium B) Sodium and oxygen C) carbon and oxygen D) Carbon and sulfur

Why solid can not be compressed

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction

An ion from a given element has 22 protons and 18 electrons. what is the charge on the ion?