Are atoms created or destroyed in a chemical reaction

Why do copper vessels turn green with the passage of time?

Can an electron be found in an exact spot within an atom

What are the examples of global warming?

How do astronomers use rocks from the moon to estimate the age of the solar system?

When light is reflected by a mirror, the angle of incidence is always

J. J Thompson proposed that atoms were made up of positively charged particles with electrons scattered into them. How did he reach this conclusion?

A bathroom scale is compressed 0.21 in. when a 210 -lb person stands on it. Assuming that the scale behaves like a spring that obeys Hooke's law, how much does someone who compresses the scale 0.06 in.

Explain what happens when a ferromagnetic material is made into a permanent magnet.

You are drawing a branching diagram to show the relationship between Turtles frogs and alligators which two organisms does the diagram indicateas having the most recent common ancestor

Estimate the length of the neptunian year using the fact that the earth is 1.50Ã108km from the sun on average.