Express 1123 pg in nanograms.

How can something with different atoms be a pure substance and not a mixture?

Separating sand from gravel physical change or chemical change?

A buffer that contains 0.123 M acid, HY, and 0.211 M of its conjugate base, Y-, has a pH of 8.67. What is the pH after 0.0018 mol of Ba (OH) 2 is added to 0.325 L of this solution?

Approximately how many different genes can be found in a human cell? A. more than a million B. less than ten C. less than one hundred D. more than one thousand

What do scientist use to measure the mass of a substance

Gasoline has a density of 0.749 g/mL. How many pounds does 19.2 gallons of gasoline weigh? Use significant figures. Do not enter "pounds" as part of your answer.

Which of these changes involved a physical change and not a chemical change?

Which of the following statements is true? Running an electric current through a magnet can create a magnetic field. Electric engines change electricity into magnetism. The strength of a magnetic field increases with distance.

valancy of x is 3 while that of y is 1. write a formula of the compounds when each of the seperaty combines with oxygen

The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as? A. Alkali metals B. Alkali earth metals C. transition metals D. inner transmission levels