Answer:
Mathematics
Explanation:
Scientists in their own way use different types of statistics. As a child I went to a scientist lab and it was huge they had microscopes, animals in glass boxes, they use math to try to figure things out.
Answer:
Incomplete exercise: isolated 0.169 g of eugenol from 5.09 g of cloves
The answer is:
The theoretical mass of eugenol is 0.8653 g and the percent recovery is 19.53%
Explanation:
The theoritical mass is equal to:
The percent recovery is:
%
Answer:
(a) Alkali metals: Francium (Fr)
(b) Chalcogens: Polonium (Po)
(c) Noble gases: Radon (Rn)
(d) Alkaline earth metals: Radium (Ra)
Explanation:
In the periodic table, the atomic mass increases down the group. Therefore, the last element of a group is the heaviest element of the group.
(a) alkali metals: The chemical elements that are present in group 1 of the periodic table, except hydrogen.
<u>The heaviest member of this group is francium (Fr)</u>
(b) chalcogens: The chemical elements that are present in group 16 of the periodic table
<u>The heaviest member of this group is polonium (Po)</u>
(c) noble gases: The chemical elements that are present in group 18 of the periodic table
<u>The heaviest member of this group is radon (Rn)</u>
(d) alkaline earth metals: The chemical elements that are present in group 2 of the periodic table.
<u>The heaviest member of this group is radium (Ra)</u>
Blank 1: polar
The difference in electronegativity between N and H causes electrons to preferentially orbit N, making the bond polar.
Blank 2: trigonal pyramidal
There are four “things” attached to N - 3 H’s and 1 lone pair of electrons. The four things together are arranged into a tetrahedral formation. However, the lone pairs don’t actually contribute to the shape of the molecule per se; it’s only the actual atoms that do. The lone pair creates a bit of repulsion that pushes the 3 H’s down, creating a trigonal pyramidal shape (as opposed to a trigonal planar one).
Blank 3: polar
The molecule as a whole is also polar because the “things” around it, though arranged in a tetrahedral pattern, are not all the same. The side of the molecule with the lone pair is slightly negative, while the side with the 3 H’s is slightly positive due to the differences in electronegativity described above.
Answer:
Specific heat capacity of aluminium is 0.869J/g°C
Explanation:
Values: 51.1g of Al, 150.0g of water, Aluminium sample: 92.1°C; Water: 18.0°C, final temperature: 22.9°C.
The heat absorbed for the water is the same relased for the aluminium, the formula is:
Where m is mass, dT is change in temperature and C is specific heat of each compound (4.18J/g°C for water)
Replacing:
150.0g×(22.9°C-18.0°C)×4.18J/g°C = -51.1g×(22.9°C-92.1°C)×C(Al)
3072.3J = 3536.12g°C×C(Al)
0.869J/g°C = C(Al)
<em>Specific heat capacity of aluminium is 0.869J/g°C</em>