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.
- 00:50 “sketch the diagram of the cake off and solve problems of half-life. Now let's define radioactivity. Radioactivity is the spontaneous disintegration or decay of nucleus of the atom of an element during which it emits alph...”
- 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...”
- 00:00 “Good day everyone. My name is Mrs. Akinola. I will be teaching you physics. Today we will be looking at radioactivity. Let's quickly look at the objective of today's lesson. At the end of today's lesson, you should be ab...”
Definition and Classification of Chemicals
This lesson defines chemicals and explains their various forms, including solids, liquids, and gases. It also classifies chemicals their hazardous nature and discusses safety measures when using them.
- 18:43 “antiseptics. We have drugs which can be consumed internally. We also have some herbs. So, basically, pharmaceutical chemicals can either be herb or chemically synthesized. Now, for nuclear chemicals, we say these particu...”
- 30:09 “watching. My name is Uche Ugo. Till the next class.”
- 08:53 “We have the non-metals. We have the halogens. The halogens are referred to as your group 7 elements. That's where you have your chlorine, your fluorine, your bromine, and some other substances. We have the alkali-ed meta...”
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
- 22:36 “While electron has one all over 1840 units, it is negatively charged. And it is found in the shelves. Now, the number of electrons found outside the nucleus are arranged. Arrangement of this electron is what is called el...”
- 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...”
- 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...”
Careers and Applications in Chemistry
This lesson covers various career paths available for students studying chemistry, including roles in education, engineering, and health services. It also explains the applications of chemistry in food production, medicine, military, and environmental science.
- 03:54 “The next is clothing. The clothes you wear are tester industries, mixtures of the knowledge of chemistry. There is nothing that has a good aspect, has a good part without having a bad part. What I was talking about next...”
- 00:02 “Good day students. My name is Adekunle. I'll be teaching you the subject chemistry. The topic is introduction to chemistry. What is chemistry? Chemistry is a branch of pure science that deals with the properties, composi...”
- 03:08 “that we use in majorly in our farms. The next is medicine. The production of drugs and various medical services as a result of what chemistry. The next application of chemistry is in the military and space science. In th...”
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...”
- 00:45 “is an example of a physical change. Also, we have change of states, melting, nucleation, solidification, anything that you do at home that is so easy to do. Those are examples of physical change. We also have magnetizati...”
- 00:00 “Good day everyone, my name is Adekunle, I will teach you chemistry. The topic we have now is particularly nature of matter, follow me as we roll. The first is changes of matter, where we have physical change and chemical...”
Chemical Symbols and Formulae
The lesson covers the symbols of the first 20 elements and how to write chemical formulae and equations. It explains the differences between elements, compounds, and mixtures, as well as the concept of radicals and valency. The laws of conservation of mass and constant composition are also discussed
- 01:34 “the symbols of the different elements that combine chemical to form the compound, E, G, calcium carbonate, or calcium triadal carbonate for. Whereby, it contains carbon and it contains calcium, one atom of calcium carbon...”
- 00:46 “sulfur, we use the phase letter S and some other examples like that. Combination of the phase, the next is, convolution of the phase letter, written in capital and one other letter from the name of the element, written i...”
- 02:30 “containing radicals. For example, calcium triosonitroid 5 contains two radicals of NO3. We have NON3 which is named sodium triosonitroid 5. It contains one radical and then we have ion3 hydrozyme. It contains three radic...”
Metals and their compounds
This lesson covers the characteristics of metals, including their ability to lose electrons and form positive ions. It discusses the classification of metals, their physical properties, and examples of common metals such as sodium, magnesium, and aluminum. The lesson also includes information on the
- 20:28 “should be able to answer these questions. Number one, explain the term matters with two examples. All right, so an equation to show how a matter can lose electron or electrons to become positively charged. Then question...”
- 01:35 “uttermost shell, tend to lose their electrons. For example, we have sodium and Meta, are you nicely by losing electrons to form sodium ion. So the ability to lose electron and become positively charged makes a Meta. So w...”
- 00:00 “Hello everyone. I'm Mrs. Olabimpe Ayoko. I'm here to teach SS 3 chemistry and the topic is Metals and its compounds. So at the end of this lesson, everybody is expected to be able to define Metals with examples. The frie...”