Answer:
Options (A), (B) and (C)
Explanation:
In an ecosystem, the transfer of nutrients takes place from one place o another. This input and output of nutrients continuously takes place in the ecosystem.
- The rainwater is also essential as it carries a certain amount of valuable nutrients such as calcium, fluoride, magnesium, and iron that are mixed with water, and this enriches the fertility of the soil and the water is taken up by the roots of the plants for the growth and expansion of plants.
- The nitrogen-fixing bacteria refers to those micro-organisms that are present in the soil and helps in the conversion of the atmospheric nitrogen into nitrogen compounds, which are helpful for the enhancement of the soil fertility.
- Chemical weathering usually refers to the process by which the rocks disintegrates due to the effect of chemical reactions. The micro-organisms and the plant roots release some acids sometimes that react with the rocks and help in breakdown releasing the nutrients that are stored in the rocks. This eventually mixes up with the soil and increases the quality of the soil.
Thus, the correct answers are options (A), (B) and (C).
Answer:
The correct answer is:
<em>(1) It is important that the sample is dissolved in just enough hot solvent. </em>
Explanation:
The process of recrystallization is important to eliminate the impurities and to obtain better crystals of the solid. The solvent used to perform the recrystallization must have a high dissolution power of the substance to be recrystallized and a low dissolution power of the impurities. This is in order to eliminate most impurities. Furthermore, <em>It is important that the sample is dissolved in just enough hot solvent </em>because this should be easy to remove after the recrystallization and the crystal should form easily when the solution cools. Also, it is better to add the hot solvent to solubilize the crystals and keep the impurities insoluble, instead of adding the cold solvent and heating the solution. Additionally, the process of cooling the solution must be done slowly to obtain large and fewer crystals. A fast ice-cooling will form smaller crystals.
Answer:
transitive physicsif something conducts heat or electricity, heat or electricity can move through it.
Explanation:
Explanation:
oxidation is adding of oxygen and removal of hydrogen.
Reduction means removal of oxygen and addition of hydrogenm
N(NaOH)=0.0688 mol
v=0.250 L
c=n(NaOH)/v
c=0.0688/0.250=0.2752≈0.28 mol/L
0.28 M