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Westkost [7]
3 years ago
14

HARD QUESTION (really need help)

Chemistry
1 answer:
torisob [31]3 years ago
5 0

Answer:

answer is A

hope this helps

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Which of these has the most covalent character? <br> NaF Caf2 Bef2 CsF SrF2
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Thus BeF2 is of most covalent character.

Anyways, covalent/ionic character is a bit tricky to figure out; we measure the difference in electronegativity of two elements bonding together and we use the following rule of thumb: if the charge is 0 (or a little more), the bond is non-polar covalent; if the charge is > 0 but < 2.0 (some references say 1.7), the bond is polar covalent; if the charge is > 2.0 then the bond is ionic. Covalent character refers to smaller electronegativity difference while ionic character refers to greater electronegativity difference.


Now, notice all of our bonds are with F, fluorine, which has the highest electronegativity of 3.98. This means that to determine character we need to consider the electronegativities of the other elements -- whichever has the greatest electronegativity has the least difference and most covalent character.
Na, sodium, has electronegativity of 0.93, so our difference is ~3 -- meaning our bond is ionic. Ca, calcium, has 1.00, leaving our difference to again be ~3 and therefore the bond is ionic. Be, beryllium, has 1.57 yielding a difference of ~2.5, meaning we're still dealing with ionic bond. Cs, cesium, has 0.79, meaning our difference is again ~3 and therefore again our compound is of ionic bond. Lastly, we have Sr, strontium, with an electronegativity of 0.95 and therefore again a difference of roughly 3 and an ionic bond. <span>
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___________ currents in the Earth's mantle cause plate movement which causes earthquakes and volcanic activity
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Convection currents in the Earth's mantle cause plate movement which causes earthquakes and volcanic activity.
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1.34 milligrams is the same as _____ kg and _____g.
Karolina [17]
Answer C is for kg and but it's .00134 for grams
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structure of a muscle cell

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If ∆H is +ve

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If ∆H is -ve

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