Answer:
B) What is the enthalpy change, ∆H, for this reaction? Show your work to receive full credit (5 points) The enthalpy change is 150. To find it we must subtract energy of products (200) & the energy of reactants (50) so 200 – 50 equals 150.
Explanation:
B) What is the enthalpy change, ∆H, for this reaction? Show your work to receive full credit (5 points) The enthalpy change is 150. To find it we must subtract energy of products (200) & the energy of reactants (50) so 200 – 50 equals 150.
Distance of lake a is 200 km at 20 degree north of east
distance between lake a and b is 230 km at 30 degree west of north
now the distance between base and lake b is given as
![d = d_1 + d_2](https://tex.z-dn.net/?f=d%20%3D%20d_1%20%2B%20d_2)
given that
![d_1 = 200 cos20 i + 200 sin20 j](https://tex.z-dn.net/?f=d_1%20%3D%20200%20cos20%20i%20%2B%20200%20sin20%20j)
![d_1 = 187.94 i + 68.4 j](https://tex.z-dn.net/?f=d_1%20%3D%20187.94%20i%20%2B%2068.4%20j)
![d_2 = -230 sin30 i + 230 cos30 j](https://tex.z-dn.net/?f=d_2%20%3D%20-230%20sin30%20i%20%2B%20230%20cos30%20j)
![d_2 = -115 i + 199.2 j](https://tex.z-dn.net/?f=d_2%20%3D%20-115%20i%20%2B%20199.2%20j)
now the total distance is
![d = (187.94 - 115)i + (199.2 + 68.4)j](https://tex.z-dn.net/?f=d%20%3D%20%28187.94%20-%20115%29i%20%2B%20%28199.2%20%2B%2068.4%29j%20)
![d = 72.94 i + 267.6 j](https://tex.z-dn.net/?f=d%20%3D%2072.94%20i%20%2B%20267.6%20j)
now the magnitude of the distance is given as
![d = \sqrt{72.94^2 + 267.6^2}](https://tex.z-dn.net/?f=d%20%3D%20%5Csqrt%7B72.94%5E2%20%2B%20267.6%5E2%7D)
![d = 277.4](https://tex.z-dn.net/?f=d%20%3D%20277.4%20)
also the direction is given as
![\theta = tan^{-1}\frac{267.6}{72.94}](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20tan%5E%7B-1%7D%5Cfrac%7B267.6%7D%7B72.94%7D)
![\theta = 74.7 degree](https://tex.z-dn.net/?f=%5Ctheta%20%3D%2074.7%20degree)
<em>so it is 277.4 km at 74.7 degree North of East</em>
the electric conductivity of gold is very high
Answer:A compound is a substance formed when two or more elements are chemically joined.
Explation:Water, salt, and sugar are examples of compounds.
I hope this helps<3