Radioactivity and Its Types
This lesson covers the definition of radioactivity and the characteristics of radioactive elements. It explains the three types of radiation: alpha particles, beta particles, and gamma rays, along with their properties. The lesson also includes the concept of half-life and decay constants.
- 02:29 “That is anytime an alpha particle is emitted from a radioactive element. Then that means an atom of helium has been emitted and helium nuclei usually represented by 4 to H e. They are relatively I mass. They have little...”
- 03:19 “beta particle is emitted from a radiative substance, then they are atomic number. We increase by 1. Why the mass number will remain unchanged? Because the mass number is a 0. Beta particles are relatively light. They hav...”
- 01:39 “elements that disintegrate spontaneously and emit radiation from their nucleus. Example of radioactive elements are uranium, radium, polonium, ionium, sodium and so on and so forth. We have three types of radiations that...”
Quadratic Equation and Roots
This lesson covers the formation of quadratic equations from given roots. It explains how to find the sum and product of the roots and demonstrates solving for unknown coefficients in a quadratic equation. Examples are provided to illustrate these concepts.
- 05:57 “with that by 2. If I do that I have beta over 2 times 2=3/8 times 2. It's clear now that your beta will be what? 3/4 so the second root is now 3/4. Now that you have it you can now go ahead to get your B. Do not forget t...”
- 10:06 “B to be 3/4 so if that is done just go ahead and substitute into it however you need to come up with some ideas I think from here the sum will have to come out and the product will have to come out and then you get it do...”
- 05:08 “It becomes clearer. I remember very well that the value of alpha is actually -1/2 okay. If that is taken you can go ahead and substitute quite well for the value of alpha and for me I can go on substituting for the value...”
Particulate Nature of Matter
The lesson covers the distinction between physical and chemical changes, including examples. It explains the difference between atoms and molecules, describes the arrangement of particles in an atom, and defines atomic number, mass number, and isotopes. The calculation of relative atomic masses of a
- 18:15 “and electrons. Now, atoms ask the nucleus, which I said has two particles. We have the protons and the neutron that these two forms the nucleus. And outside the nucleus, there are some negative particles called the elect...”
- 21:48 “Let's remember that proton is positively charged. Electron is negatively charged. So, if they are the same. It means I have plus two minus two. Remember that neutron is neutral. So, an atom is electrically neutral. No ch...”
- 19:01 “has two particles, the proton and the neutron. Now, these electrons are found in places called the shell. The shell closes to the nucleus. It's called the K shell. And we have depending on the element. Depending on the e...”
Changes of Matter and Atomic Structure
The lesson covers the differences between physical and chemical changes in matter. It explains the concepts of atoms and molecules, their arrangements, and introduces atomic number, mass number, and isotopes. The lesson also includes calculations of relative atomic masses.
- 04:05 “The proton is positively charged, and the neutron is neutral, why the electron is negatively charged. The proton and the neutron are in the nucleus. High electron revolve around the orbits. Atoms are electrical in neutra...”
- 03:14 “The nest is Dalton's atomic theory, and according to Dalton in 1808, it proposed some theories, which form the basis for atoms. The first is all elements are made up of small individual particles, called atom. The nest i...”
- 01:39 “very well, you discover that all these changes are not easily reversed. The moment they are formed, you can actually get them back. Also, reaction of matters and trials carbonate for, which dilutes acids, reaction of alk...”
Solution and Solubility
This lesson covers the concepts of solution, solute, and solvent. It defines solubility and explains different types of solutions, including saturated, unsaturated, and super saturated solutions. Factors affecting solubility and calculations related to solubility are also discussed.
- 07:53 “These are collets, where solid particles are dispersed, in liquid medium. A very good example of that, some examples of that are starch, glue, jelly, like your petrullo jelly is an example, so take note of that. Now, we...”
- 07:05 “are larger than the particles of the true solution, but not large enough to be seen by the naked eye. So, examples of collets are starch and abumé. Now, we know what an abumé is, an abumé is just a white spot, that is a...”
- 06:15 “Now, let's not know the difference between a true solution and a colleta solution, all right? A true solution is for when solute particles dissolve in such that they are able to get in between the solid particles, take n...”