Mastering chemistry based on the data thomson collected in his experiments using cathode rays, the concept of atomic structure was modified. which of the following statements about the atomic structure were validated by his cathode ray experiments?

The list of choices from which you have to check all that apply is:

The correct choices are:

Explanation:

From the five statements, only the second one, In the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge, is not validated by the data Thomson collected in his experiments.

Nevertheless, he conjectured that that was the right structure and proposed the famous Plum Pudding Model of the atom, which ended not being correct.

The cathode rays are streams of negatively charged particles produced in an electrode. As, those rays did not change for different kind of electrodes or gases, it was concluded that they were present in all the forms of matter. So, this validate the first statement, Particles of the cathode rays are fundamental to all matter.

Thomson determined the ratio charge/mass for these particles of the cathode rays and found that the mass was much smaller than the mass of the lightest atom (hydrogen atom). This meant that there were particles smaller than the atom. This validates the fourth and fifth statements: There are subatomic size particles in an atom and Cathode rays have mass.

Since, the matter is electrically neutral, the fact that there are negative particles meant that there are also positive charges that balance the charge of the atom making in neutral. This is the third statement Matter contains negative charge and by inference positive charge.

As already stated, this does not say where and how the negative and positive charges are in the atoms, so the second statement, In the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge, is not validated by the data Thomson collected.

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.