Answer:
A spinning ball creates a "Centrifugal Force" because you give it the "energy" to spin. A ball that is not moving does not require any external energy to keep it still.
Explanation
Answer: -
First Ionization energy IE 1 for element X = 801
Here X is told to be in the third period.
So principal quantum number n = 3 for X.
For 1st ionization energy the expression is
IE1 = 13.6 x Z ^2 / n^2
Where Z =atomic number.
Thus Z =( n^2 x IE 1 / 13.6)^(1/2)
Z = ( 3^2 x 801 / 13.6 )^ (1/2)
= 23
Number of electrons = Z = 23
Nearest noble gas = Argon
Argon atomic number = 18
Number of extra electrons = 23 – 18 = 5
a) Electronic Configuration= [Ar] 3d34s2
We know that more the value of atomic radii, lower the force of attraction on the electrons by the nucleus and thus lower the first ionization energy.
So more the first ionization energy, less is the atomic radius.
X has more IE1 than Y.
b) So the atomic radius of X is lesser than that of Y.
c) After the first ionization, the atom is no longer electrically neutral. There is an extra proton in the atom. Due to this the remaining electrons are more strongly pulled inside than before ionization. Hence after ionization, the radii of Y decreases.
20%
The codeine percentage strength of the solution is 20%
- The term "percent strength" describes the proportion of a material that has dissolved in a given volume of liquid.
- Knowing how parts relate to wholes is the secret of % strength: A percent is equal to x parts out of 100 overall.
<h3>Meaning of percentage strength</h3>
- The amount of a liquid is often measured, and the % strength tells you how many parts by volume of the active ingredient are present.
- 100 parts by volume are included in the total volume of the solution or liquid preparation.
<h3>How do you determine a solution's strength?</h3>
Mass of solute times strength of solution(g) Amount of the solution(L)
- The amount of solute dissolved in grams per liter of the solution is used to determine the solution's strength.
- It stands for the solution's potency or concentration.
- It uses grams per liter to express.
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Answer:
6.25 hours
Explanation:
From the question;
- Penny can knit 4 rows in 5 minutes
We need to determine the time it will take for her to knit 300 rows
4 rows = 5 minutes
300 rows = ?
= (300 × 5 ) ÷ 4
= 375 minutes
But, 1 hour = 60 minutes
Therefore;
= 375 ÷ 60
= 6.25 hours
Thus, it will take penny 6.25 hours to knit 300 rows