Answer:
The attractive force is negative and MgO has a higher melting point
Explanation:
From Couloumb's law:
Energy of interaction, E = k 
where q1 and q2 are the charges of the ions, k is Coulomb's constant and r is the distance between both ions, i.e the atomic radii of the ions.
If you look at Coulomb's law, you note that in the force is negative (because q1 is negative while q2 is positive).
In addition to that, the compounds MgO and NaF have similar combined ionic radii, then we can determine the melting point trend from the amount of energy gotten
The melting point of ionic compounds is determined by 1. charge on the ions 2. size of ions. while NaF has smaller charges (+1 and -1), MgO (+2 and -2) has larger charges and greater combined atomic radii. This implies that the compound with greater force would have a higher melting point.
Hence the compound MgO would have a higher melting point than NaF.
Answer:
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Answer:
Mass = 73.73 g
Explanation:
Given data:
Mass of Mg used = 24.48 g
Mass of HCl used = ?
Mass of hydrogen gas produced = 2.04 g
Mass of Magnesium chloride produced = 96.90 g
Solution:
Chemical equation:
Mg + 2HCl → MgCl₂ + H₂
Number of moles of Mg:
Number of moles = mass/ molar mass
Number of moles = 24.48 g/ 24.305 g/mol
Number of moles = 1.01 mol
Now we will compare the moles of Mg with HCl from balance chemical equation.
Mg : HCl
1 ; 2
1.01 : 2/1× 1.01 = 2.02 mol
Mass of HCl react:
Mass = number of moles × molar mass
Mass = 2.02 × 36.5 g/mol
Mass = 73.73 g
4.3 x 10⁻⁸dm⁻²
Explanation:
Problem:
To solve this problem, we have apply the right rule of indices operation.
If we have an indices in the form;
= (
)
Solving this problem:
= 
x 10
)
= 0.43 x 10⁻⁷
= 4.3 x 10⁻¹ x 10⁻⁷
= 4.3 x 10⁻⁸
for the units:
= 
The solution is: 4.3 x 10⁻⁸dm⁻²
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Basically, an element<span> is made of only one kind of atom, while a </span>compound<span> contains the atoms of two or more </span>elements<span>.
Just to give you a good exaple:
Gold is made of only one kind of atom, so it's considered an </span>element<span>, but water is a mix of hydrogen and oxygen, so it's a </span>compound<span>.</span>
