The chemical standard for the quantity of a mole is based on which substance?

How many moles of HCl are in 125 mL of 0.1 M HCl

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. Which element is element X?

Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds. sulfate = SO4 - 2 phosphate = PO4 - 3 hydroxide = OH - sodium sulfate NaSo4 Na2SO4 Na (SO4) 2 NaSO8

Is mayonnaise an element compound solution or colloids

What must methane be combined with to undergo a combustion reaction? A. Hydrogen B. Oxygen C. Carbon Dioxide D. Energy

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water

If the body temperature of a person is recorded as 37°c, what is the person's body temperature in k? round your answer to the nearest whole number.

Pf3cl2 is a nonpolar molecule. based on this information, determine the f-p-f bond angle, the cl-p-cl bond angle, and the f-p-cl bond angle. enter the number of degrees of the f-p-f, cl-p-cl, and f-p-cl bond angles, separated by commas (e. g.

What is the empirical formula of a substance that contains 2.64g of C, 0.444g H and 3.52g of O