Answer: Activation energy
Explanation:
In a chemical reaction, the reactants contains particles which must collide in order for a reaction to occur. The rate of reaction depends on the frequency of effective collision between the reacting particles. Effective collision are those that result in reactions, which when they occur the colliding particles become activated with increased kinetic energy.
This energy must exceed a particular energy barrier for a particular reaction if the reaction must take place. This energy barrier that must be overcome before a reaction takes place is known as the ACTIVATION ENERGY.
To explain further, when two particles or molecules A and B come in contact with each other, for a reaction to take place, they must collide with a sufficient force to break the bond that exists between them. The minimum combined kinetic energy these reactant particles must possess in order for their collision to result in a reaction is called the activation energy.
Answer:
The attraction of the soil to the inside of the surfactant micelle helps loosen the soil from its surface. Once the soil lifts off the surface, it becomes suspended in the water in the micelle. This suspension is also known as emulsification of one liquid into another.
Answer:
A tin atom and 2 molecules containing two hydrogen atoms bonded to one oxygen atom.
Explanation:
Equation of reaction:
SnO2 + 2H2 ---> Sn + 2H2O
According to Dalton's postulates:
1. All elements are made up of small indivisible particles called atoms
2. The atom cannot be created nor destroyed
3. The atoms of the same element are alike in every aspect and differ from atoms of all other elements
4. During a chemical reaction there is a combination of atoms in small whole numbers.
From the given options, the one that satisfies the postulates of Dalton is:
"A tin atom and 2 molecules containing two hydrogen atoms bonded to one oxygen atom"
This is because it gives a balanced chemical equation for the number of atoms reacting for each element is equal to the number of atoms of each element produced. This is in accordance with the postulate that atoms are neither created nor destroyed.
The three other postulates are also obeyed. The small whole number ratio for the reactants and products in the chemical reaction is 1 : 2 : 2.
<h3>Answer:</h3>
Compound A is Ethylbenzene.
<h3>Explanation:</h3>
The structure of Ethylbenzene was elucidated and finalized based on following facts:
1) The presence of multiplet signal ranging from δ 7.27 to 7.40 ppm confirms the presence of aromatic protons. Also the statement says that this signal is for 5 protons indicating that the benzene ring is mono substituted.
2) The substituted group on benzene is Ethyl because the quartet for two protons shows that two protons (-CH₂-) are coupled with a CH₃ group. Hence, the ethyl group gives one quartet and one triplet signal.
3) The chemical reaction stated in statement is Nitration reaction. Also, the alkyl group (ethyl) is ortho-para directing in nature. Hence, it will give two products i.e. 1-Ethyl-2-nitrobenzene and 1-Ethyl-4-nitrobenzene respectively.
Attached figure gives the calculated NMR spectrum of Ethylbenzene and the chemical shifts calculated are almost near to the given values. Also, the two products formed are shown.
