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.
- 04:51 “Atomic number, a mass number. What is atomic number? This is number of protons present in the nucleus of an element, and it is denoted towards z. The mass number of an element is the sum of the protons and the neutrons i...”
- 02:25 “Examples of molecules are nitrogen, oxygen, molecule, chloride, sodium, chloride, calcium, chloride. Sodium channels are naturally 5, and the likes of them. The number of atoms in the molecule of element is called atomic...”
- 05:37 “atom of the element is heavier than 1/12, the mass of one atom of carbon 12. It has no unit. What are isotopes? From isotopes, which is the phenomenon, isotopes are atoms with the same atomic number, but different mass n...”
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.
- 04:57 “It is a very important part of every element because it gives the uniqueness of the element. Every atom contains what is referred to as a proton. Now, the number of proton in the atom of an element is what we call the at...”
- 04:08 “What we mean by building block is that they make up other compounds or mixtures. So, everything comes from being a single or everything originated from an element. Elements include your ion, which is called FE. That's th...”
- 05:42 “The diagram on the screen is a silicon compound. You can see it is dark gray. This is silicon. It is an element. Now, forms of an element. Elements come in different forms but they all have the same type of atoms. Now, d...”
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.
- 03:10 “Now the fresh 20 elements are also a good overview of the different element groups. They also occur in more everyday chemical reactions. The elements are listed in order of increasing atomic number. You will be discussin...”
- 02:23 “Oxygen forms compounds by reacting with practically any other element. So oxygen can be had with hydrogen and it is going to give you water. So oxygen can react with any element. So oxygen in its normal state from the pi...”
- 18:51 “Number three, write the confirmatory test of oxygen. Thank you for watching. I am Miss Taipei, see you next time.”
Rational and Non-Rational Numbers
This lesson covers the identification of rational and non-rational numbers. It explains the characteristics of different number sets, including natural numbers, whole numbers, and integers. The lesson also discusses the significance of the number PI in relation to circles.
- 00:56 “And to determine particle appropriate values for the PI, the PI. Now, the PI is usually used doing what? A cycle, that's the cycle phase of the cycle, to bring in your PI. How do we determine that? Now, move on straight...”
- 01:42 “They're natural numbers. They include the positive counting numbers. So you talk about your 1, your 2, your 3, your 4, your 5. As far as this is positive and this is counting number, it is called a natural number. Take n...”
- 19:46 “Thank you very much, we've come to the end of this class. I remain Oyase Ose Sunday. See you in the next class.”
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
- 15:36 “4 N O, nitrogen 2 Z. Then you have 2 times this to give us 6 water. With this, you can check whether your equation is balanced or not by doing atom count. On the return side, on the return side, my nitrogen, my hydrogen,...”
- 12:18 “For chemical equation to actually represent a chemical reaction, it must be balanced. It must be balanced. That is, the number of atoms at the left hand side must be equal to the number of atoms at the right hand side. W...”
- 13:57 “And now you balance hydrogen. Check the atom count. You have 3 hydrogen A, you have 2 hydrogen A. The best I can balance this is, I put 2 A. Like I told you, you don't balance down. You don't balance by the soft grit. Yo...”
Water and Its Properties
This lesson covers the composition of water, including its chemical formula H2O. It explains the physical properties of water, such as its states (solid, liquid, gas), boiling and melting points, and its ability to dissolve various substances. The lesson also discusses the importance of water in liv
- 05:50 “Water molecules made up of two elements, hydrogen atom and oxygen atom. From the picture you would see hydrogen atom and the oxygen atom. A single oxygen atom contains six electrons. If you count, you will notice that yo...”
- 00:10 “Good day, everyone! My name is Mr. Ife and I'm your basic science instructor. Our lesson today is "Says, Water, and Rustam". A quick round through the objectives. At the end of the class, students should be able to expla...”