What is the approximate size of an atom?

Which of the following compounds is both heteroatomic and triatomic?

Which of the following subatomic particle/charge pairing is correct?

A vitamin tablet has a mass of 1.2 g. What is the total mass of 15 tablets?

A chemical change always results in:

Round 0.07492 to one significant figure

Which state of matter has a definite volume but no definite shape?

Water (H2O) is classified as a:

Which of the following contains only exact values?

Please pick one of these to answer. Number it with #1 or #2 whichever you are answering. Do not skip this it is worth a lot of points1. Exobiology is the study of life on other planets. In recent years scientists have sent various spacecraft out into the galaxy in search of extraterresterial life. Assuming that all life shares common properties, what should exobiologists be looking for as they explore other worlds?2. Comparing a bacterium a salt crystal (NaCl) and a pine tree explain which of these is considered alive or not and state the specific reasons why it is considered alive or not. Address all 3.