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➷ The elements atomic number would be 91. The atomic number is simply the number of protons.
Extra info: The atomic mass would be the total of the number of protons and neutrons.
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Answer:
a, b and d are correct.
Explanation:
There are two types of attractive forces in covalent compounds:
- The force that holds the atoms together in a molecule (the covalent bond).
- The force that <u>operates between molecules</u>, called an intermolecular force.
Because intermolecular forces are usually quite weak compared with the forces holding atoms together within a molecule, <u>molecules of a covalent compound are not held together tightly</u>. Consequently, covalent compounds are usually gases, liquids, or low-melting solids.
Most covalent compounds aqueous solutions generally do not conduct electricity, because the compounds are nonelectrolytes.
Answer:
A
Explanation:
the chloroplast holds the water , nutrients
ΔG° = 14.1 kJ/mol
For the reaction A → B, <em>K</em> = [B]/[A].
If [A] = 240 and [B] = 1, then
<em>K</em> = 1/240 = 4.167 x 10^(-3)
The relationship between Δ<em>G</em>° and <em>K</em> is:
Δ<em>G</em>° = -<em>RT</em>ln<em>K</em>
where
<em>R</em> = the gas constant = 8.314 J·K^(-1)mol^(-1)
<em>T</em> = the Kelvin temperature
In this problem, <em>T</em> = (37 + 273.15) K = 310.15 K
∴ #Δ<em>G</em>° = -8.314 J·K^(-1)mol^(-1) × 310.15 K × ln(4.167× 10^(-3)
= -2579 × [-5.481 J·mol^(-1)] = 14 100 J·mol^(-1) = 14.1 kJ/mol
Note: We should expect Δ<em>G</em>° to be positive because <em>K</em> < 1.
Combustion reaction
Key: O2
O2 is normally in a chemical formula when you are used to burn anything, so basically, anything with O2 involves burning.
