The poles are located at the 90 degrees. The poles are extremely cold environments. If you think about how relatively close to the pole 60 degrees would be, you can assume it would be cold but not as extreme. So short summer, cold winters seems to be the most accurate.
You can also see in a map (attached) where the 60 degrees parallel actually is, and you can see what the climate tends to be in those areas.
<span>Halflife is the time needed for a radioactive molecule to decay half of its current mass. If t is the time elapsed, the formula for the halflife would be:
final mass= original mass * </span>
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If you put the information of the problem into the formula, the equation will be:
</span>final mass= original mass *
final mass= 800g *
Exothermic:
An Exothermic reaction is a chemical reaction that expels energy in the form of heat/light. Everything a Endothermic does not do. Pretty simple for this one
reactants → products + energy.
For future reference - Exo means release, thermic means heat.
<u>Energy is a Reactant </u>
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<u>_________________________________________________________</u>
Endothermic:
An Endothermic reaction essentially is draining the heat energy from anything its its surroundings. Usually its just heat but can also be salt dissolving it water or ice melting. Another example would be frost on your windshield evaporating.
It is the exact opposite of an Exothermic reaction.
<u>Energy is a Product</u>
1 mole = 6.022*10^23 atoms
4.2 moles sulfur = 4.2* 6.022 * 10^23 sulfur atoms = 2.421*10^24 sulfur atoms
1 mole sulfur = <span>32.065 g sulfur
4.2 moles sulfur = 4.2 * </span>32.065 g sulfur = 128.901 g sulfur
2NaOH + ZnCl2 → 2NaCl + Zn(OH)2
Zn(OH)2 is your precipitate.
No. of moles of NaOH = 2.50X50.0÷1000 = 0.125mol
2mol of NaOH reacted to produce 1 mol of Zn(OH)2.
No. of moles of Zn(OH)2 produced when 0.125mol of NaOH reacted
= 0.125 x 1 ÷ 2
= 0.0625mol
Mass of Zn(OH)2 = 0.0625 x [65.4+2(16+1)] = 6.21g
