Answer:
Metallic.
Explanation:
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In this case, when nickel and tin bond, the difference in their electronegativities results:
Such difference, in addition to the fact that nickel is a transition metal and tin a metal, will suggest that the predominant type of bond for this substance is metallic as the attractive force between the conduction of electrons and positively charged metal ions is present.
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It will behave has a conductor in high voltage
Answer: 9.8g
Explanation:
The calculation is based on the fact that all the water in the molecule will be removed.
i will, then, calculate the mass of water removed and then subtract it from the original 20.0 g of sample.
You can do that following these steps.
1) Calculate the number of moles of the hydrated magnsium sulfate, MgSO₄⋅7H₂O
number of moles = mass in grams / molar mass
The molar mass of MgSO₄⋅7H₂O is calcualted from the atomic mass of each atom times the number of atoms in the formula:
molar mass = 24.305 g/mol + 32.065 g/mol + 4×15.999g/mol + 7×2×1.008g/mol + 7×15.999 g/mol = 246.471 g/mol
⇒ moles of MgSO₄⋅7H₂O = 20.0g / 246.471 g/mol = 0.0811 moles
2) Calculate the number of moles of water, using the ratio from the chemical formula:
7 moles H₂O / 1 mol MgSO₄⋅7H₂O = x / 0.0811 mols MgSO₄⋅7H₂O
⇒ x = 0.0811 × 7 moles H₂O = 0.568 moles H₂O
3) Convert moles of H₂O to grams:
number of moles = mass in grams × molar mass = 0.568 moles × 18.015 g/mol = 10.2 g
4) Hence the mass remaining is 20.0g - 10.2g = 9.8g
Spiral galaxies have three main components: a bulge, disk, and halo (see right). The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars. The disk forms arm structures. Our Sun is located in an arm of our galaxy, the Milky Way. The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk. The halo contains old clusters of stars, known as globular clusters<span>.
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Elliptical galaxies are shaped like a spheriod, or elongated sphere. In the sky, where we can only see two of their three dimensions, these galaxies look like elliptical, or oval, shaped disks. The light is smooth, with the surface brightness decreasing as you go farther out from the center. Elliptical galaxies are given a classification that corresponds to their elongation from a perfect circle, otherwise known as their ellipticity. The larger the number, the more elliptical the galaxy is. So, for example a galaxy of classification of E0 appears to be perfectly circular, while a classification of E7 is very flattened. The elliptical scale varies from E0 to E7. Elliptical galaxies have no particular axis of rotation.
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