Answer:
A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.
<u><em>Physical properties:</em></u>
Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.
<u><em>Example. </em></u>
Water when freezes into ice, it is physical change, just state is change.
<em><u>Chemical properties:</u></em>
The chemical properties depend upon composition.
<u>Example:</u>
Formation of precipitates is an example of chemical change.
Answer: -1835 kJ
Explanation:
According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.
According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
(1)
(2)
Net chemical equation:
(3)
Multiplying equation (1) by 4, and reversing we get
(4)
Adding (2) and (4)
Thus enthaply change for the reaction is -1835 kJ.
Answer:
Smooth endoplasmic reticulum (SER) is a type of endoplasmic reticulum consisting of tubular vesicles that lack ribosomes on the outer surface and is involved in the synthesis and storage of lipids. Rough ER has ribosomes on the outer surface. Smooth ER does have riboszomes on the outer surface.
Explanation:
Answer:
Explanation:
In the peak stage of a flood where it current is very high,there is much deposition of sediment dumped into the stream by mainly overland flow and gully erosion.This leads to huge sediment deposition on the stream bed.
As the flood 's current reduces,competence and capacity reduces and sediments are deposited.