Answer:
Explanation:
carbon in group 4A needs 4 more electrons to be stable
hydrogen in group 1A has one electron needs 1 more t o be stale
oxygen in group 6A has 6 and needs 2 more to be stable
They all obtain this by sharing electrons 8 around C &O, 2 around H
H : C: H
::
:O:
This is a question about the colligative property known as freezing point depression. Freezing point depression (the amount the normal freezing point of the solvent is decreased) can be calculated with this equation:
ΔT = i Kf<span> m
</span>
Where i (the van't Hoff factor) is the degree of dissociation of the solute, Kf is the freezing point depression constant, and m is the molality of the solution.
Here i = 2 (KCl dissociates into 2 ions, K+ and Cl-), Kf = 1.86 C/m (for water), and m = 0.743m).
ΔT = 2 x 1.86 C/m x 0.743m = <span>2.764C
</span>
That means the freezing point of the solution is 2.764C less than the pure solvent (water), making it 0C - 2.764C = -2.764C.
Answer:
Human land use impacts the environment by causing certain events which can lead to more serious events such as climate change, poor air and water quality, and environmental degradation.
One example is when humans clear out space such as forests (deforestation). This leads to habitat loss which lowers the population of certain species affecting biodiversity thus impacting the environment.
Explanation:
<span>The prefix is used to indicate that the main chain of a hydrocarbon contains four carbon atoms is "but-". Examples of carbon compounds with four carbons in the main chain are: butane, butanol, butyl, butene, etc. It can be observed that all of the compounds have a common prefix of "but".</span>
<span>TRUE
The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses.</span>