Antioxidants are the substance that prevent oxidation process in a cell, oxidation produce free radical, and free radicals harm the cell. The oxidation number is the count of electrons present in an atom.
<h3>What is ascorbic acid?</h3>
Ascorbic acid (vitamin C) is a water-soluble vitamin that is present in the citrus fruits and vegetables.
Ascorbic acid act as an antioxidant and prevent the production of free radicals in a cell.
Thus, Antioxidants are the substance that prevent oxidation process in a cell, oxidation produce free radical, and free radicals harm the cell. The oxidation number is the count of electrons present in an atom.
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Your Question: There are two kinds of elements that didn't appear on the periodic table until after 1892. What kinds are they and why do you think it took so long to discover them?
The Answer: Moseley’s analysis enabled chemists to refine the table further and reveal more gaps, which suggested that there were more new elements waiting to be discovered, with atomic numbers 43, 61, 72 and 75. Scientists subsequently found these elements—now known as technetium, promethium, hafnium and rhenium, respectively.
Explanation: Physicist Henry Moseley discovered the atomic number of each element using x-rays, which led to more accurate organization of the periodic table. We will cover his life and discovery of the relationship between atomic number and x-ray frequency, known as Moseley's Law.
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Answer:
a. 0.66 atm
Explanation:
Pi = 750 torr = 0.99 atm. Pf = ?
Vi = 400 ml Vf = 600ml
Using PiVi = PfVf
Then 400ml × 0.99atm = Pfatm × 600ml
Solving for Pf, we have,
Pf = (400ml × 0.99atm)/600ml
Pf = 0.66atm
Alcohol is the answer. On plato its the right answer i hope it helps.
Answer: 0.84 g
Explanation:
![\text{ Mass of iron}=\text{ Moles of iron}\times \text{ Molar mass of iron}](https://tex.z-dn.net/?f=%5Ctext%7B%20Mass%20of%20iron%7D%3D%5Ctext%7B%20Moles%20of%20iron%7D%5Ctimes%20%5Ctext%7B%20Molar%20mass%20of%20iron%7D)
Given: moles of iron = 0.015
Molar mass of iron = 56 g/mol
![\text{ Mass of iron}=0.015\times 56g/mol=0.84g](https://tex.z-dn.net/?f=%5Ctext%7B%20Mass%20of%20iron%7D%3D0.015%5Ctimes%2056g%2Fmol%3D0.84g)
Thus 0.84 g of iron participated in the chemical reaction.