20. Which of the following is NOT true for the atoms 13N, 14N, and 'N?

a. They all have the same mass number.

b. They are isotopes.

c. They all have the same atomic number.

d. They all have 7 protons.

e. They all have 7 electrons.

Which formula represents a polar molecule containing polar covalent bonds?

Darrel conducted an experiment with the following procedure: Fill two cups with ice water. Place an uninflated balloon snuggly onto your left index finger. Blow a little air into an identical balloon, and place it onto your right index finger.

Carbon is allowed to diffuse through a steel plate 13-mm thick. The concentrations of carbon at the two faces are 0.654 and 0.377 kg C/m3 Fe, which are maintained constant. If the preexponential and activation energy are 6.

Are all conduters magnetic

After learning about the law of conservation mass, Remy began to wonder about how to best test this law. She wanted to show that the amounts of matter did not change but produced an equal amount of a different kind of matter.

Barium-131 is a radioactive isotope of the element barium used for gastrointestinal tract scans in doctors offices. Barium-131 has a half-life of 10 days.

The name for Na2 O in chemistry

What is the simplest alkane

Looking for a cute girl

What are some reasons why the research should be put through a peer-review process?