Answer:
Explanation:
Mean of observation of A = 87.63
Mean of observation of B = 87.06
Mean of observation of C=87.76
So reading of B is closest to true volume hence his result is most accurate. Reading of C is least accurate.
As far as precision of measurement is concerned, it depends upon measuring instrument. From the reading it appears that the measuring instrument is the same because the no of significant figure of the reading is same ( three) . Hence their reading are equally precise.
Calcium ions have a charge of “2+”because they are in group two (column number 2)
Skip over the transition metals
Fluoride ions would have a charge of
“1-” because they are all the way near the end of the table in the second last group (group 7)
Hope that helps :)
Dang. Kind to think of it, it would be pretty DARK.
No plants would grow as they need sunlight.
It's gonna be pretty hard to live. But here are:
5 ESSENTIAL SURVIVAL TIPS TO DO IN CASE THE SUN DISAPPEARS FOR A LONG TIME WITH NO SIGNS OF COMING BACK.
1. Find an essential place to stay for an extended period of time.
2. Bring enough food and water to stop getting hungry.
3. Tune in the TV every few periods of time to check on the world status. Chances are, that everything is dying slowly.
4. That's actually it. I don't know well enough to know how you will survive. For 7 days it would be OK.
Answer:
To get the number of atoms in this sample, we first need the number of moles of lead in 11.3 grams
<u></u>
<u>Number of moles of Lead:</u>
Molar mass of lead = 207 grams / mol
Number of moles = given mass / molar mass
Number of moles = 11.3 / 207
Number of moles = 0.05 moles
<u>Number of atoms of lead in 11.3 gram sample:</u>
Number of atoms = Number of moles * avogadro's number
Number of atoms = 0.05 * 6.022 * 10²³
Number of atoms = 5 * 10⁻² * 10²³ * 6.022
Number of atoms = 30.11 * 10²¹
Each correspond to a principal energy level