Answer: It will take for the concentration of A to decrease from 0.900 M to 0.210 M is 28.75 s
Explanation:
Zero order reaction : A reaction is said to be of zero order if the rate is independent of the concentration of the reactants, that means the rate is directly proportional to the zeroth power of the concentration of the reactants.
Expression for the zero order kinetics:
![[A]=-kt+[A]_o](https://tex.z-dn.net/?f=%5BA%5D%3D-kt%2B%5BA%5D_o)
where [A] = concentration left after time t = 0.210 M
![[A]_o](https://tex.z-dn.net/?f=%5BA%5D_o)
= initial concentration = 0.900 M
k= rate constant =
t = time for reaction = ?
Thus it will take for the concentration of A to decrease from 0.900 M to 0.210 M is 28.75 s
Answer: 7.608 x 10∧23
Explanation:
Using Avogadro's Number;
1 mole of Phosphorus (P4) molecule contains 6.02 x 10∧23 molecules.
∴ 0.316 mole of Phosphorus (P4) will contain; 0.316 x 6.02 x 10∧23 =
1.902 x 10∧23 molecules.
1 molecule of Phosphorus (P4) is made up of 4 atoms.
∴ 1.902 x 10∧23 molecules Phosphorus (P4) will contain :
1.902 x 10∧23 x 4 = 7.608 x 10∧23 atoms
0.316 mole of phosphorus contains 7.608 x 10∧23 atoms.
Answer is: a. Mg + 2HCl → H₂ + MgCl₂.
Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.<span>
Oxidation half reaction: Mg</span>⁰ → Mg²⁺ + 2e⁻.
In this chemical reaction, magnesium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).
Answer:
The correct answer is option A. They receive instructions in their DNA.
The DNA (deoxyribonucleic acid) or the genes present in the cell guides the fate of the cells during the process of cellular differentiation in the embryonic life of the multicellular organism. The signaling molecule change the genetic expression changes, by which the cells are differentiated.
