What does the word unicellular and multicellular mean? and What is the main difference between prokaryotes and eukaryotes?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Solar energy is energy from the sun that is converted into thermal or energy. a. nuclear b. mechanical c. electrical d. chemical

Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d.the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge