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.
- 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...”
- 14:11 “I've had it time without non-biased students, we say, I want to measure my weight. You can never measure your weight. What you measure is the mass. Because weight is a function of mass and acceleration due to gravity. So...”
- 23:44 “its scalar quantity, but a weight as magnitude and the direction and hence its vector quantity. The third one is it is the amount of matter contained in a body as explained earlier, the amount of matter, which is the fun...”
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...”
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...”
- 06:28 “The rate of atomic mass of an element is the average mass of its various isotopes as they occur naturally in any quantity. We are going to prove that with chlorine, chlorine 35 and chlorine 37, giving the relative abodea...”
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.
- 15:04 “And it is obtained by calculating half of the total mass of the object multiplied by the square of its velocity, that is, half MV square. So, M is the mass of the object and V is the velocity of the object. So, we have a...”
- 11:31 “Now, it is given by MGH, where M is the mass of the body. Now, G refers to acceleration, but this small G you see is acceleration due to gravitational force. And its value is about 9.8 m/s square, but it can be approxima...”
- 13:19 “So, our potential energy will be 20 kg, which is the mass of the body multiplied by the height, which is about 8 m and the acceleration due to gravity, which is 10 Newton/kg. We obtained 1,600 joules, which is the unit o...”
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...”
- 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...”
- 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...”