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Rufina [12.5K]
3 years ago
7

Which of the following pairs of elements are likely to form ionic compounds? Check all that apply. Check all that apply. magnesi

um and chlorine sodium and potassium nitrogen and iodine chlorine and bromine helium and oxygen potassium and sulfur
Chemistry
1 answer:
Roman55 [17]3 years ago
8 0

Answer:

magnesium and chlorine

Explanation:

An ionic bond is usually formed between a metal and a nonmetal. An ionic bond involves the transfer of one or more electrons from a highly electro positive metal to a nonmeta.

Usually, the electro negativity difference between the two species involved in an ionic bond is usually high.

For instance, the electro negativity of magnesium is 1.31 while that of chlorine is 3.16. This implies that they have a difference in electro negativity of about 1.85 between them which is large enough to be considered as leading to a pure ionic bond. An electro negativity difference above 1.7 is generally regarded as leading to the formation of an ionic bond.

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What is the product(s) in the reaction below?<br> CH4(g)202(g)→ CO2(g) + 2H20(g)
konstantin123 [22]

Answer:

It is an example of Exothermic reaction.

Explanation:

It leads to release of HEAT as can be seen water is given in gaseous form.

6 0
3 years ago
Qualitatively estimate the relative melting points for each of the solids, and rank them in decreasing order. Rank from highest
baherus [9]

Answer:

The order is

Quartz > Calcium > Ammonia > Chlorine

Explanation:

Among given compounds

Quartz is a covalent compound with extensive bondings and thus it will have highest melting point

Calcium is a metal so it will have strong metallic bonds thus will have high melting point, however less than quartz.

ammonia is a polar molecule with weak hydrogen bond as intermolecular interactions thus will have higher melting point than chlorine

chlorine is a non polar molecule with weak intermolecular london dispersion forces.

3 0
4 years ago
Ammonium carbonate decomposes upon heating according to the following balanced equation:
Ugo [173]

Answer : The total volume of gas produced are, 11.5 L

Explanation :

First we have to calculate the moles of ammonium carbonate.

\text{Moles of }(NH_4)_2CO_3=\frac{\text{Mass of }(NH_4)_2CO_3}{\text{Molar mass of }(NH_4)_2CO_3}

Molar mass of (NH_4)_2CO_3 = 96.094 g/mol

\text{Moles of }(NH_4)_2CO_3=\frac{11.9g}{96.094g/mol}

\text{Moles of }(NH_4)_2CO_3=0.124mol

Now we have to calculate the moles of total gas.

The given balanced chemical reaction is:

(NH_4)_2CO_3(s)\rightarrow 2NH_3(g)+CO_2(g)+H_2O(g)

From the balanced chemical reaction we conclude that,

As, 1 mole of (NH_4)_2CO_3 react to give 4 mole of gas

So, 0.124 mole of (NH_4)_2CO_3 react to give 0.124\times 4=0.496 mole of gas

Now we have to calculate the volume of gas.

Using ideal gas equation:

PV=nRT

where,

P = Pressure of gas = 1.05 atm

V = Volume of gas = ?

n = number of moles = 0.496 mole

R = Gas constant = 0.0821L.atm/mol.K

T = Temperature of gas = 24.0^oC=273+24.0=297.0K

Putting values in above equation, we get:

1.05atm\times V=0.496mole\times (0.0821L.atm/mol.K)\times 297.0K

V=11.5L

Thus, the total volume of gas produced are, 11.5 L

6 0
3 years ago
Calculate the standard enthalpy change for the reaction at 25 ∘ C. Standard enthalpy of formation values can be found in this li
Anastasy [175]

Answer:

-179.06 kJ

Explanation:

Let's consider the following balanced reaction.

HCl(g) + NaOH(s) ⟶ NaCl(s) + H₂O(l)

We can calculate the standard enthalpy change for the reaction (ΔH°r) using the following expression.

ΔH°r = 1 mol × ΔH°f(NaCl(s)) + 1 mol × ΔH°f(H₂O(l)) - 1 mol × ΔH°f(HCl(g)) - 1 mol × ΔH°f(NaOH(s))

ΔH°r = 1 mol × (-411.15 kJ/mol) + 1 mol × (-285.83 kJ/mol) - 1 mol × (-92.31 kJ/mol) - 1 mol × (-425.61 kJ/mol)

ΔH°r = -179.06 kJ

7 0
3 years ago
Sweat is made up of all EXCEPT what?<br> *<br> A.Sugar<br> B.Salt<br> C.Urea<br> D.Urine
andreev551 [17]
D, Urine.

Just google what sweat is made of and it gives you all of the answers except for urine. Also you’d probably smell really bad if your sweat had urine in it. Hope this helps! :)
8 0
3 years ago
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