4. In which pair of elements are the chemical properties of the elements most similar? (This is a multiple-choice question)
a) sodium and chlorine
b) nitrogen and phosphorus
c) boron and oxygen
Explain your reasoning.

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas