Blog

Which of the following boxes represents a pure compound? A B C

A magnetic field best changes the direction of a beam of electrons when the beam and the field

What is the name of the compound with the formula CBr4?

The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6, calculate the atomic mass of lithium, Li (atomic number 3).

A certain element emits 1 alpha particle, and its products then emit 2 beta particles in succession. The atomic number of the resulting element is changed by

Compared with the primary rainbow, the secondary bow

Red sunsets are due to light of lower frequencies that

Carefully examine the following reaction sequence for the catalytic formation of ozone, O 3, from molecular oxygen, O 2. Which chemical compound is behaving as the catalyst?  O 2 + 2 NO → 2 NO 2  2 NO 2 → 2 NO + 2 O  2 O + 2 O 2 → 2 O 3

When  Ra decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?

According to the following balanced chemical equation, if you want to generate two moles of H 2O, how many molecules of O 2 do you need? 2 H 2 + O 2 → 2 H 2O