Salt at higher concentrated levels causes soil aggregates to break down, collapsing soil pores and reducing movement of air and water, thus causing less water infiltration and increased erosion. All of this creates a surface above the soil and once it dies it creates a crust like blockade, keeping saplings from breaking through. This also basically suffocates the plants already living there. Hope it helped!!
SI Unit
I'm not 100% sure but I think that's right. Hope I helped you in any way.
The first thing you need to know about this problem is that delta total = delta Hf products - delta Hf reactants.
Delta total = (4*NO + 6*H2O) - (5*O2 + 4*NH3)
Delta total = [(4*91.3 kJ/mol) + (6*-241.8 kJ/mol.) - (5*0 kJ/mol.) + (4*-45.9 kJ/mol.)
Products= 4*(365.2)+(-1450.8)=-1085.6 kJ
Reactants=4*(-45.9) + 5*(0)= -183.6 kJ
Delta Rxn= (-1085.6 kJ) - (-183.6 kJ) =-902.0 kJ
Solution :
The reasons for the melting point determines :
- the assignment of the sample's purity
- identification of the unknown sample
- the conversion of solid sample to the liquid completely
In order to prepare the sample in the capillary tube for determining its melting point, we tap the tube gently into the sample with the open end of tube down. We then continue tapping the tube till the sample is couple of millimeters high.
Then the other close end of tube down, we tap the sample down again slowly or then dropping the tube into a longer tube so as to move down the sample faster.
Answer:
Zinc
Zinc blende
(ZnS)
-----------------
Lead
Galena
(PbS)
-----------------
Mercury
Cinnabar
(HgS)
----------------
Copper
Copper glance
(Cu2S)
-------------------
Explanation:
Had to learn this for a test
Also, I plead the 5th