Explanation:
has lost 1 electron. Therefore, a potassium ion has a smaller radius since it has less electrons.
Answer:
Average atomic mass = 58.51047 amu
The symbol is ![Ni](https://tex.z-dn.net/?f=Ni)
Explanation:
The formula for the calculation of the average atomic mass is:
Given that:
For first isotope:
% = 68.274 %
Mass = 57.9353 amu
For second isotope:
% = 26.095 %
Mass = 58.9332 amu
For third isotope:
% = 1.134 %
Mass = 61.9283 amu
For fourth isotope:
% = 3.593 %
Mass = 63.9280 amu
For fifth isotope:
% = 0.904 %
Mass = 63.9280 amu
Thus,
![Average\ atomic\ mass=39.55474 +15.37861854+0.702266922+2.29693304+0.57790912](https://tex.z-dn.net/?f=Average%5C%20atomic%5C%20mass%3D39.55474%20%2B15.37861854%2B0.702266922%2B2.29693304%2B0.57790912)
Average atomic mass = 58.51047 amu
The symbol is ![Ni](https://tex.z-dn.net/?f=Ni)
The answer is C, it makes the block easier to lift by changing the direction of the force needed to lift it
Answer: Because liquid particles are free moving and need a container for it to take shape.
Explanation: Liquids have free moving particles.
Answer:
mass of the gram after 28 days = 1.29 grams
Explanation:
From the diagram attached below; we would see the plot of the mass vs the time (days).
However ; to predict what would be the mass of the crystal after 28 days if the growth is linear; we have the following analysis;
Let the mass be Y ( since it falls on the y-axis) and the time (days) be X (since it falls on the x-axis)
So; we can have a table as shown below:
X Y XY XX
0 0.500 0 0
7 0.648 4.536 49
14 0.899 12.586 196
21 1.081 22.701 441
Total
:42 3.128 39.823 686
If the growth is linear ; the linear regression equation can be represented as :
y = a+ bx
where ;
![a = \dfrac{\sum Y * \sum XX - \sum X * \sum XY }{n* \sum X X- ( \sum X)^2}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7B%5Csum%20Y%20%2A%20%5Csum%20XX%20-%20%5Csum%20X%20%2A%20%5Csum%20XY%20%7D%7Bn%2A%20%5Csum%20X%20X-%20%28%20%5Csum%20X%29%5E2%7D)
and
![b= \dfrac{n * \sum XY - \sum X* \sum Y }{n* \sum X X- ( \sum X)^2}](https://tex.z-dn.net/?f=b%3D%20%5Cdfrac%7Bn%20%2A%20%5Csum%20XY%20-%20%5Csum%20X%2A%20%5Csum%20Y%20%7D%7Bn%2A%20%5Csum%20X%20X-%20%28%20%5Csum%20X%29%5E2%7D)
n = samples given = 4
x = number of days = 28
so;
from the table ; replacing the corresponding values; we have:
![a = \dfrac{3.128* 686 - 42 * 39.823 }{4* 686- (42)^2}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7B3.128%2A%20%20686%20-%2042%20%2A%2039.823%20%7D%7B4%2A%20686-%20%2842%29%5E2%7D)
![a = \dfrac{2145.808 -1672.566}{2744- 1764}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7B2145.808%20-1672.566%7D%7B2744-%201764%7D)
![a = \dfrac{473.242}{980}](https://tex.z-dn.net/?f=a%20%3D%20%5Cdfrac%7B473.242%7D%7B980%7D)
a = 0.4829
![b= \dfrac{4 * 39.823 - 42* 3.128 }{4* 686- ( 42)^2}](https://tex.z-dn.net/?f=b%3D%20%5Cdfrac%7B4%20%2A%2039.823%20-%2042%2A%203.128%20%7D%7B4%2A%20686-%20%28%2042%29%5E2%7D)
![b= \dfrac{159.292 -131.376 }{2744- 1764}](https://tex.z-dn.net/?f=b%3D%20%5Cdfrac%7B159.292%20-131.376%20%7D%7B2744-%201764%7D)
![b= \dfrac{27.916 }{980}](https://tex.z-dn.net/?f=b%3D%20%5Cdfrac%7B27.916%20%7D%7B980%7D)
b = 0.0289
Recall:
y = a+ bx
y = 0.4829 + 0.0289 (28)
y = 0.4829 + 0.8092
y = 1.2921 grams
y ≅ 1.29 grams
mass of the gram after 28 days = 1.29 grams