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blsea [12.9K]
3 years ago
14

Need help with chemistry hw please help

Chemistry
2 answers:
Andru [333]3 years ago
5 0
Co2 = two covalent bonds
ccl4 = 4 covalent bonds
Lih = covalent bond
Tju [1.3M]3 years ago
5 0
FOR THE TABLE:
Mg has an atomic number of 12. This means it has 12 protons and starts with 12electrons before bonding. It may be helpful to draw these ones out at first until you get the hang of it. If Magnesium has 12 electrons then it will have 3 shells of electrons before it bonds. 2 electrons in the first shell. and 8 in the second shell.When it bonds with Cl₂ it will lose the outer most shell of electrons. now it has only 2+8 electrons because Cl₂ stole the other two electrons to satisfy their octet. Therefore, Mg will have the configuration of the noble gas that has an atomic number of 10 and each Cl atom will have the noble gas configuration of the noble gas with 18 as their atomic number because each chlorine stole one electron.


For CO₂ I knew it was Polar covalently bonded because Carbon has an electronegativity value of 2.5 and Oxygen has and electron negativity value of 3.5. In order to be a POLAR covalent bond the difference in electronegativity between atoms must between 0.4 and 1.8. 3.5-2.5= 1 . Because 1 is between 0.4 and 1.8 these C-O bonds are polar covalent. 

LiH was a tricky one because the electronegativity difference wasn't that high, but apparently it is still considered an ionic bond. H steals one of Li's 3 e- so that they both have 2 electrons and look like Helium.

Hope my pictures help a little. This was a tough homework so please ask if you are still confused about something and I'll try my best  to clarify.

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deff fn [24]
Can you please translate it to english?
4 0
2 years ago
Which of the following elements is most likely to form a covalent bond?
Alecsey [184]
Bromine, it's the only element that isn't a metal
7 0
3 years ago
Round 10235.0 to four significant figuers
dolphi86 [110]
Greetings!

Significant Digits are:
-Non Zero Numbers
-Zeros in between Non Zero Numbers
-Trailing zeros to the right of the decimal point

So when rounding to 4 significant figures, we get:
1023

Hope this helps.
-Benjamin

8 0
3 years ago
Part 2 please and explain please
vekshin1

1) 7.15 * 10^6

since the exponent of the scientific notation is positive, move 6 places to the right.

so, <em>7.15 * 10^6 = 7150000</em>

2) 3.03 * 10^-8

Since the exponent of the scientific notation is negative, move the decimal point 8 places to the left.

so,<em> 3.03 * 10^-8 = 0.0000000303</em>

<em />

3)<em> </em>4.9 * 10^-1

since the exponent of the scientific notation is negative, move 1 decimal place to the left.

so,<em> 4.9 * 10^-1 = 0.49</em>

<em />

4) 2.886 * 10^5

since the exponent of the scientific notation is positive, move 5 decimal places to the right.

so,<em> 2.886 * 10^5 = 288600</em>

6 0
3 years ago
Dolomite, [CaMg(CO3)2] is found in a soil sample. A geochemist titrates 24.65 g of soil with 57.85 mL of 0.3315M HCl. What is th
pshichka [43]

In order to find out the %mass dolomite in the soil, calculate for the mass of dolomite using the information given from the titration procedure. You would need to multiply 57.85 ml with 0.3315 M HCl and you would get the amount of HCl in millimoles. Then multiply the amount of HCl with 1/2 (given that for every 1 mol of dolomite, 2 mol of HCl would be needed). Convert the amount of dolomite to mass by multiplying the millimoles with the molecular weight which is 184.399. Then convert the mass to grams which is 1.768 grams. Divide the mass of dolomite (1.768 grams) with the weight of soil sample. The % mass is 7.17. 

8 0
3 years ago
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