DDT is: A. banned in the United States B. still being used in other countries C. to blame for the near extinction of some bird species D. all of the above

At a certain temperature the vapor pressure of pure heptane C7H16 is measured to be 454. mmHg. Suppose a solution is prepared by mixing 102. g of heptane and 135. g of chloroform CHCl3.

What element has an r. m. m of 72

If an apple has eight seeds and one apple has a mass of 0.2kg, how many apple seeds are in 14 kg apple

One mole of silver has a mass of 107.9 grams. Approximately how many atoms of silver are present in one mole of silver? A) 107 atoms B) 108 atoms C) 6 x 1023 atoms D) 53 x 1023 atoms

Which of the following can you determine from mass spectrometry data

Which of the following statements correctly describes how Moseley's research affected the development of the periodic table? Moseley's research led to the reorganization of the elements based on their atomic mass instead of their physical appearance.

A minerals luster is produced by its ability to transmit light. Opaque minerals always have a metallic luster because they do not transmit any light. True False

The elements selenium and oxygen are both poor electrical conductors in which section of the periodic table are they found

What is the mole ratio of NaOH to Al (OH) 3

What is Atomic mass A: the mass of the atom based on the mass of an atom of oxygen-16 B: the mass of an atom based on the mass of an atom of carbon-12 c: the average mass of all isotopes d: the mass of the atom based on the mass of an atom of