For the molarity and the percentage of the mass of kcl are mathematically given as
%m/m = 23.1%, molarity = 3.38M
<h3>What is the molarity?</h3>
Generally, the equation for the percentage of the mass of kcl is mathematically given as
(mass of kcl/mass of solution)x 100
therefore
%m/m = (6.31/27.29)x100
%m/m = 23.1%
The molarity
(no of mol/ vol of sol)
molarity = 0.0846mol/0.0250 L
molarity = 3.38M
In conclusion, the molarity is given as
molarity = 3.38M
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The question is incomplete, The complete question is;
Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. What experimental evidence led to the development of this atomic model from the one before it?
Answer:
A few of the positive particles aimed at a gold foil seemed to bounce back.
Explanation:
This model of the atom was proposed by Ernest Rutherford and was called the planetary model of the atom.
This model is based on an experiment using a gold foil on which alpha particles were focused. Most of the alpha particles passed through the foil. Some of the alpha particles were scattered at large angles and a few seemed to bounce back.
This led to the conclusion that the atom has a massive positive core around which electrons move as planets move around the sun.
The answer is Strontium(Sr). The reactive increase from right to left. And this element has two valence electrons. So Rb is not correct. Then the very reactive metal is Sr.
A model of an atom is important in the understanding of the properties of all the objects around us. We can identify whether a specific material is iron or gold or anything else. Due to the model of an atom we can characterize each element. Elements in the same group would show similar chemical and physical properties present. This is because those elements have similar electronic configuration and we know this due to the atomic model. Also, it helps us to have an idea on how to synthesize certain substances so we can just produce them rather than obtaining it from natural means. With a better understanding of an atom, we can better understand chemical principles.