When two liquids mix without absorbing or releasing heat, it is an isothermal process where the temperature of the mixture remains constant. A common example is mixing water and ethanol.
When two liquids mix without absorbing or releasing heat, it means that the mixing process is isothermal. This is because the temperature of the mixture remains constant throughout the process.
One example of this is when you mix equal amounts of water and ethanol. Both liquids have similar intermolecular forces, so they mix easily. The temperature of the mixture remains the same as the initial temperature of the liquids.
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The atomic number of an atom is determined by the number of protons present in the atom that is the atomic number and number of protons are same for an atom. It is unique for every atom.
Atomic mass: It is nearly equals to the sum of mass of subatomic particles present in the atom that is sum of proton and neutron.
Number of neutrons: in an atom, the number of neutrons are always equal to the number of protons. If the number of neutrons are different for a number of proton then it is said be an isotope of that atom.
Protons plus neutrons: Sum of number of protons and number of neutrons is said to be the mass number of that atom.
Hence, the atomic number is the number of protons.
b. neutron.
c. proton.
d. nucleus.
Answer:
The central portion is called neutron.
Explanation:
An atom has a central part known as nucleus and outer shells.
The central nucleus contains protons (the positively charged sub atomic particle) and neutrons (the neutral sub atomic particle).
The outer portion has negatively charged sub atomic particle known as electrons.
The atomic number of an element is the number of protons present in the nucleus.
Answer:
The Answer is Nucleus
Explanation:
The Nuleus is the brain of the atom always like the "boss"
As reactants form products, the potential energy increases.
Thermal energy is transferred from the product to the reacting substances.
Thermal energy is transferred from the surroundings to the reacting substances.
Answer is: As reactants form products, the potential energy decreases.
There are two types of reaction:
1) Endothermic reaction (chemical reaction that absorbs more energy than it releases).
2) Exothermic reaction (chemical reaction that releases more energy than it absorbs).
For example, balanced chemical reaction:
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O ΔrH= -1370 kJ/mol.
This reaction is exothermic reaction (heat is released), so products have less potential energy and energy is transerred to surroundings.
Considering the definition of exothermic reaction, as reactants form products, the potential energy decreases (first option).
Energy is the ability to do work or to produce heat.
Chemical reactions involve a rearrangement of atoms between substances with the breaking or formation of chemical bonds. In general, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.
In exothermic reactions, energy is released when they occur (usually this energy is released in form of heat), so the reaction system temperature increases.
In a chemical reaction, the reactants are the compounds that are transformed and give rise to the products. Reactants and products have stored potential energy. In an exothermic reaction, the reactants have more potential energy compared to the products, so the excess energy is released as heat, thus complying with the law of conservation of energy, which says that energy is not lost. gain or loss, so the energy of the reactants must be equal to that of the products.
In summary, considering the definition of exothermic reaction, as reactants form products, the potential energy decreases (first option).
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