Lead have:
82 electrons
82 protons
125 neutrons
Explanation:
The number of electrons and protons are given by the atomic number of the element.
Lead have 82 electrons and 82 protons.
The number of neutrons are given by the difference between the mass number and atomic number.
For lead number of neutrons = 207 - 82 = 125.
Learn more about:
particles in the atom
brainly.com/question/439508
#learnwithBrainly
Answer:
A)adding heat to the system and having the system do work on the surroundings
Explanation:
The variation in the internal energy of a system (ΔU) is given by the First Law of Thermodynamics. See the equation below:
ΔU = Q + W
Q: Heat added (+) or removed (-) from the system
W: work done on (-) or done by (+) the system
If you add heat (Q +) and have the system do work (W +), you guarantee that th internal energy of the system will increase (ΔU +).
Answer:
Explanation:
The Sebacic acid has strong hydrocarbon content which make it insoluble in water. Treating the unknown sample with a base for example NaOH will increase the solubility of the Sebacic acid because the carboxylic acid group will react with the base to form soluble ionic salt. The Sebacic acid is completely dissolved in the base
The resulting solution can be titrated with HCl until there is a color change signifying end of neutralization. The mole of NaOH present before the organic acid is noted, then after titration the mole of the HCl acid is subtracted from the initial mole of the base; this will give the carboxylates present in the solution.
Explanation:
they are located in the neucleus