Answer:
Polymers are long chain molecules that occur naturally in living things and can also be made by chemical processes in industry. Plastics are polymers, so polymers can be extremely useful.
Explanation:
Answer:
magnesium + water == magnesium oxide + hydrogen
Answer:
817.66 g/mol
Explanation:
The <em>freezing point change</em> can be calculated by the formula:
Where m is the molality of the solute in NO, Kf is the cryoscopic constant (in K·kg/mol), and i is 1 in this case (because the substance in non-dissociating).
We can <u>calculate Kf of NO</u> with the information given by the problem and the formula:
Where R is the universal gas constant (8.314 J·mol⁻¹·K⁻¹), M is the molar mass of NO (30 g/mol, or 0.03 kg/mol), T f is the freezing point of NO (in K), and ΔH is the heat of fusion.
- Kf = 8.314 J·mol⁻¹·K⁻¹ * 0.03 kg/mol * (109.16 K)² ÷ 2300 J/mol = 1.292 K·kg/mol
Now we calculate the molality of the solute in NO:
<em>Molality is equal to the moles of solute per kilogram of solvent</em>:
- 0.1370 m = moles solute/ 1 kg NO
- moles solute = 0.1370 moles
With the given mass of the solute we <u>can calculate the molar mass</u>:
- 112 g / 0.1370 moles = 817.66 g/mol
Reforestation is when you plant trees. Generally they do this in places that they have cut trees down. They do this to replace the trees they cut down. Therefore reforestation is a positive impact
Urbanization is basically making land into a city. This is negative because it is destroying habitats that were previously there and the traffic will cause air pollution in the area around it. There are other negative impacts of urbanization but I can't think of any more at the moment.
Terrace farming is...oof Idk how to explain it... it's basically where they cut steps into hills and farm on them. I'll link a picture below so you know what it looks like. This is a good way to use all the land possible. It's also one of the best ways to decrease erosion. This is positive use of the land.
btw you put reforestation twice. Idk if that was another option or if it was on accident, but I wanted to let you know :)
There fore the answer is...
dun dun:
Urbanization!!!
Hope this helped!