1. A 250-ul sample is needed from a sterile vessel that is too thin to use with anything but a sterile pipet. Which pipet and pipet pump could be used to withdraw the mL equivalent of 250 uL from the
vessel?

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

answer carbon and three oxygen atoms;