Why do magnets have to face each other to attract

The reaction below can be catalyzed by bromine (Br2). if you carried out such a reaction, which compound would you expect to find in the reaction container at the end of the reaction? A) Br2 B) BrO C) BrH2 D) BrO2

A new element has two isotopes, one with a mass of 40.0 amu and the other with a mass of 42.0 amu. the atomic weight is 40.50 g/mol. pick the true statement a. the isotope at 42.0 amu is less abundant b. the element has 19 protons and 21 neutrons c.

What does it mean to say that an electron's energy within an atom is quantized?

How are protons, electrons, and neutrons correctly compared

How does natural gas affect the way humans live

What are primary and secondary alkanols

Hydrogen is 99% hydrogen-1; 0.8% hydrogen-2; and 0.2% hydrogen-3. calculate it's average atomic mass

Uranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian Time? Explain.

Earth's oceans contain many dissolved elements like calcium, sodium, and chlorine. These elements plus several others combine to form the salts in the oceans.

What is physical change in chemistry?