One isotope of beryllium has an atomic number of 4 and a mass number
of 9. Draw a model of a beryllium atom,
labeling the protons, neutrons, and electrons.
Also label the charge on each particle.

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.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?