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.
- 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...”
- 13:03 “Finally, our molecular formula will simply be C times this 2, H times water times 2, 4, n, o, 2. I believe you understand that, and you can see that from here. The molecular formula is CH2, H4, o2, if you arrange it, you...”
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...”
- 00:48 “Also you can become a laboratory assistant. The next career part is chemical engineering. We acknowledge your physics, chemistry, and mathematics. You can become a chemical engineer that involves the processes of combati...”
- 01:34 “compared to non-evalupling environmentally friendly product. The next is forensic chemistry. You can see these people in the aspect of crime. The enabled also investigate crime very well. The next aspect, very important,...”
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.
- 30:09 “watching. My name is Uche Ugo. Till the next class.”
- 19:34 “is used in hospitals for detecting the sex of a baby. Now, we have agrochemicals. Agrochemicals, as the name implies, are those used for agricultural purposes. We have the fertilizers, the organic manuals. We have the pe...”
- 28:34 “exits those of the building in case of danger or explosion of chemicals. It is also important to memorize the emergency procedures which is required to evacuate or exit the building at any point in time. Also, while you...”
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
- 13:06 “you don't say N2, it should be ordinary, it will be ordinary key, it will be ordinary sodium, which is N8. And then in simple chemical reactions, radicals would be main words. On change, radicals, it's main, on change. I...”
- 10:44 “mass canada be created, no destroyed. If you want to see mass, mass canada be created, no destroyed. And the next law we talk about, states the law of definite proportion, or constant composition, we say that all pure sa...”
- 11:31 “from mathematical equation. Mathematical equation can simply be represented with conservation by equals to that for mathematical equation. Yeah, in chemistry that's why it is stated that chemical equation, different for...”
Oxides of Carbon
This lesson covers the two types of carbon oxides: carbon monoxide and carbon dioxide. It explains their formation, characteristics, and methods of preparation in the laboratory. The lesson also defines the term allotrope and discusses the economic importance of these oxides.
- 33:48 “so for example this is actually used by a manufacturer of glass, so you know, add detergents, okay, so then for this one is deployed in baking powder, or to discharge our carbon-folks, right, so as that helps to reduce t...”
- 21:43 “So, now, here we have this. You see, this is a metal here, magnesium metal. They react with this to give us this one, and also this. So, we actually reduce this carbon to this. That's what you are seeing here, okay? So,...”
- 12:26 “Which actually has the ability to oxidize itself. So, basically, as a ability to oxidize to cover four oxide in the presence of compounds like metallic oxides, basically. And steam and iodide also, okay? Or iodine oxide....”
Carbon and its Allotropes
The lesson covers the characteristics of carbon as an element and its various forms, known as allotropes. It explains the presence of carbon in nature, its compounds, and the two types of carbon oxides. The importance of carbon in living systems and its economic significance is also discussed.
- 21:57 “To antracite, for example, is used for preparing graphite for the manufacture of citratical petrol by catalytic adrogenation of co-que, so that is how antracite co-que can be obtained, all right? So, now, for the wood, y...”
- 18:41 “So how do we carry this carbonization process? Now basically, you find out that, like we mentioned before, for carbonization, it's a complex mixture, what's it called? Compounds composed of a million of carbon, all right...”
- 20:20 “is used for the manufacture of pharmaceutical products and also as a solvent, okay? So for co-ta, co-ta is a mixture of more than 200 different substances, which can be separated by a fraction of distillation, so of cour...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It explains potential and kinetic energy as forms of mechanical energy. The lesson also includes calculations related to work done and the concept of power as the rate of doing work.
- 09:52 “You prove what we call a teen plate. We also have chemical energy. Chemical energies are stored in bones. We have covalent and ionic bones. Now, these kind of energies exist in atomic, molecular or element states. Now, t...”
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
- 18:43 “with the Ozzides. Ozzides ion to release the electrons necessary for reduction of the matter. What am I talking about? So carbon of the A, carbon that reacts with the oxygen gives us CO which is carbon two or that plus t...”
- 17:57 “four or that. This is a reduction process. Carbon two or that is a reducing agent. It reduces ion three or that to elemental ion and carbon four or that. The reduction of suffice. Remember the oxide can be reduced and no...”
- 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...”
Properties of Oxygen and Hydrogen
This lesson covers the properties, preparation, and tests of oxygen and hydrogen gases. It explains the role of these gases in the environment and their reactions with other elements. The lesson also includes information on the physical states of oxygen.
- 09:42 “Now we have here lead oxide. When you go through tamarge composition, it breaks into lead and oxygen. Then your oxygen is being taken at this point and for tamarge composition of hydrogen peroxide, because it includes wa...”
- 16:16 “This mix together, you get the salt and hydrogen gas, which becomes zinc chloride and hydrogen. When this is decomposed, you get zinc chloride and you also get hydrogen. And as a result, hydrogen is being stored in this...”
- 17:08 “Now, the test for hydrogen. The pop-up test, when it leads tapah, when using a leads tapah, it will produce an audible pop when placed in hydrogen glass, gas. Gases can be produced in the school laboratory when a compoun...”