Answer:
1.015g
Explanation:
From the question,
Mass of Al used = 0.660g
The percentage yield = 63.5%
Mass of Alum used = y
To find the mass of Alum used, do the following:
%yield = Mass of Al /Mass and Alum
65% = 0.660/y
65/100 = 0.660/y
Cross multiply
65 x y = 0.660x100
Divide both side by 65
y = (0.660x100) / 65
y = 1.015g
The mass of alum obtained is 1.015g
Answer: The bond formed between magnesium and oxygen is an ionic bond.
Explanation:
An ionic bond is formed when an atom transfer its valence electrons to another atom.
Whereas, a covalent bond is formed by the sharing of electrons between the atoms.
Silicon and oxygen forms silicon dioxide. Silicon has 4 valence electrons which are shared with each oxygen atom. Hence, silicon and oxygen forms a covalent bond.
Oxygen and oxygen shares two pairs of electrons therefore, a covalent bond is formed between oxygen and oxygen.
A covalent bond is formed between carbon and hydrogen as carbon has 4 valence electrons which are shared with four hydrogen atoms.
Magnesium has 2 valence electrons which are transferred to the oxygen atom in order to complete its octet.
Therefore, the bond formed between magnesium and oxygen is an ionic bond.
Jupiter, Saturn, Uranus and Neptune are the jovian planets<span>. Mercury, Venus and Earth are the </span>terrestrial planets<span>. ... Well, the </span>jovian planets<span> are less dense when compared to the </span>terrestrial planets<span>, because they are mainly and composed of hydrogen gas.</span>
Answer:
<u>Eclipse: </u>3. To vanish
<u>Corona: </u>2. During a solar eclipse, the moon covers the sun, a small ring of fire is visible around the edge
<u>Umbra:</u> 4. The inner, darkest, cone-shaped shadow is
<u>Penumbra:</u> 1. The outer, larger, lighter shadow