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...”
- 11:32 “First, with the empirical formula and your value of n, which are going to determine first, empirical formula times n will be equal to the relatively molecular mass. This is CH2On, equals to the molecular mass, 60, put th...”
- 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...”
Fundamental and Derived Quantities
This lesson covers the definitions of fundamental and derived quantities in physics. It explains how fundamental quantities serve as the base for deriving other quantities and the importance of measurement in physical science.
- 22:53 “So multiplying 50, which is the mass of the man, times the acceleration due to gravity, which is 9.8, we have 490. And I showed you that weight or the force of an object is usually measured in new things. So the unit is...”
- 20:28 “So I need to clarify this more and more at this point in time. When we talk about mass, we are talking about the quantity of matter contained in a body. The quantity of matter contained in a body. And the mass of an obje...”
- 13:26 “the time is major in second. So measurement of time, of mass, we are most often time, we are very much interested in knowing the mass of an object. So what are the instruments that we use for measuring the mass of an obj...”
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
- 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...”
- 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,...”
- 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...”
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.
- 27:44 “molar mass of lead nitrates, now lead is 207, lead is 207, then our nitrogen is 14, oxygen is 16, but the time you carry out all the addition, you know, the mathematics, so you arrive at 331 grams, then number of moles o...”
- 10:59 “so solubility is coming to express also as mass times 1,000 all over molar mass times volume. Now, how this is actually gotten is, we know that solubility from the definition, solubility is equal to not the most of solut...”
- 26:58 “actual to express in more PDNQ, now already here you have to bring out what is it that we're giving, here, we are giving basically the mass, all right, then now we're giving the volume, take note of that, all right, we'r...”
Converting Base 10 to Binary
This lesson teaches how to convert base 10 numerals into binary numbers using two methods: subtraction and successive division. Students will learn to identify the powers of 2 and apply them in the conversion process.
- 00:00 “Hello everyone, I am Esther Oluchi, your Mathematist teacher, and the topic of today's lesson is "Conversion of based and numerals to binary numbers." By the end of the lesson, you should be able to convert based and num...”
- 01:32 “You have to be familiar with the powers of 2. To be able to convert numbers from base 10 to numbers in base 2, you have to be familiar with the powers of 2. So, 2 to the power of 0 equals 1 to the power of 1 equals 2 to...”
- 08:00 “So, let's look at example 3. Convert 7 in base 10 to a number in base 2. Okay, now let's solve example 3, which says, Convert 7 in base 10 to a number in base 2. So, let's do that also. We have 7, example 3, 7 in base 10...”