What is the physical properties and the physical change ?
Answer:
1. A physical property is any property that can be observed using the five senses or can be measured without changing the matter.
2. A physical change is a change where no new substance is formed. Physical changes affect the form of a substance, but not what it's made up of
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Answer:
3 Fe₂O₃(s) + H₂(g) ⇒ 2 Fe₃O₄(s) + H₂O(g) ΔH° = -6.00 kJ
Explanation:
Let's consider the following balanced equation.
3 Fe₂O₃(s) + H₂(g) ⇒ 2 Fe₃O₄(s) + H₂O(g)
When 1 mole of Fe₂O₃(s) reacts, 2.00 kJ of energy are evolved. Energy is an extensive property. In the balanced equation there are 3 moles of Fe₂O₃(s), so the evolved energy is:
By convention, when energy is evolved it takes the negative sign. At constant pressure, the thermochemical equation is:
3 Fe₂O₃(s) + H₂(g) ⇒ 2 Fe₃O₄(s) + H₂O(g) ΔH° = -6.00 kJ
where
ΔH° is the standard enthalpy of reaction (heat released at constant pressure)
Agree with the statement like most of human achievements chemistry has been used as well as misused.
Science help in development of culture and promoting human civilization but human misused this achievements in their self interest. Like innovation of nuclear power system helps in increasing nation's development but at the same time man is misusing this atomic energy for making powerful bomb.
Explanation:
Human achieved their success in various field with the help of science and technology. Every aspects of things has two side. Its depend upon us which one we will take off. Specifically chemistry the hard core science contributes a lot in upgrading civilization like innovation of nuclear power system which can reduce the use of other conventional energy resources which is much needed for our future generation.
But our so called society and civilization use this technological and scientific achievements in a negative way and produce nuclear bomb to fulfill their self interest.
Solubility and temperatures are directly related. The higher the temperature of the solvent, the higher the solubility of the solute in the solvent.
Dissolving a solute in a solvent is an endothermic process hence providing heat favors the process. Higher temperatures cause the molecules of the solvent to have high kinetic energy hence bombard each other and with that of the solute with high frequency. This then ensures fast diffusion of the solute particles in the solvent.