Answer:
d. ii.
Explanation:
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In this case, according to the displayed decimal placed by each balance, we can notice that:
i. Displays 1 decimal place.
ii. Displays 2 decimal places.
iii. Displays 4 decimal places.
iv. Displays 3 decimal places.
Thus, since the measured-out masses have two decimal places each, we infer that the used balance was d. ii as it displays two decimal places.
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Answer: He theorized that all material bodies are made up of indivisibly small “atoms.” Aristotle famously rejected atomism in On Generation and Corruption. Aristotle refused to believe that the whole of reality is reducible to a system of atoms.
Explanation:
Answer: A material that readily transmits energy is a conductor, while one that resists energy transfer is called an insulator .
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Formula for pH is pH = -log [H+]
you use 4.0x10^-9 and substitute in for [H+]
Fromula looks like this:
pH = -log (4.0x10^-9) - from here different calculators will require different buttons to push to get the answer
Solved out:
pH = -log (4.0x10^-9)
pH = -(-8.398) = 8.398 is the pH
The number of valence electron in sodium is 1 and that in chlorine are 7. In order to complete the octet (8 electrons in outermost shell) sodium can give its valence electron to an atom with more electronegativity. Here, chlorine is more electronegative than sodium, due to 7 valence electrons it required one more electron to complete its octet.
Therefore, chlorine can take 1 valence electron of sodium to form ionic bond. In the ionic compound so formed, both sodium and chlorine have complete octets. In aqueous solution they exist as 
and 
ions, the positive charge on sodium indicates that it donates its one electron and negative charge on chlorine indicates that it accepts an electron.
All this happen due to difference in electronegativity of sodium and chlorine (chlorine is more electronegative than sodium).
