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.
- 12:18 “I don't know, they're 12 plus 2, give us 14, 14 plus 16, we give us 30. So you have 30 n equals to 60, divided both sides by the coefficient of n, which is, which is 30, you have to say, by the coefficient of n, which is...”
- 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...”
- 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...”
Gas Laws Overview
This lesson covers the basic gas laws including Boyle's Law and Charles's Law. It explains the relationship between volume, pressure, and temperature of gases, and introduces the Kelvin scale for temperature. The general gas equation PV = nRT is also discussed.
- 21:14 “If you cross multiply, you're going to have rate, it also constant means that as long as you have many rates of diffusion and as long as there are many densities, you can't be comparing them. And then to represent this t...”
- 27:08 “and a pressure of 1.013 tends to be about 5 Nm square. Calculate the temperature, at which its volume will be doubled at the same temperature. You apply the right law, you get to answer correctly. The second one says a g...”
- 23:38 “of 1. Now comparing with hydrogen and the gas s, R8 over Rs equals to square root of that m represents our relative molecular mass this time over these, put in the values. And then Gavin's knowledge that rate is volume o...”
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
- 17:24 “So another modification to Dalton's atomic theory is that atoms of the same element are not exactly alike in every way because of the phenomenon called isotropy. Who gets to that? Also, giant organic molecules and comple...”
- 08:04 “identity of that element. You can also define an atom as the smallest particle of an element, which can take part in chemical reaction. That is, the identity of that element is still intact. Molecule. A molecule is the s...”
- 14:49 “all the atoms of oxygen are alike, but differ from atoms of chlorine. When atoms combine with other atoms, they do so in simple ratios, meaning that what we found in formation of water, this is in ratio of ratio 2 to 1....”
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...”
- 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...”
- 00:00 “Good day everyone, my name is Adekunle, I am teaching you chemistry and the topic we have now is chemical symbols, formulae and equation. Chemical symbols, formulae and equation. What are chemical symbols? The symbol of...”
Work, Energy and Power
This lesson covers the definitions of work, energy, and power. It includes calculations for work done, gravitational potential energy, and power in watts. The lesson also distinguishes between kinetic and potential energy and explains energy transformation and the law of conservation of energy.
- 21:29 “is the potential energy will be converted to the kinetic energy of the body. And kinetic energy is a scalar quantity. If an object of mass M moves with a speed of velocity V, the magnitude of the kinetic energy, which is...”
- 23:21 “Now substituting the values, now we have multiplied by 5, multiplied by 10 square. And now we have multiplied by 5 multiplied by 100. And we have multiplied by 500. And that would be 250 joules. That's how we calculate t...”
- 24:09 “A bullet of mass 50 gram lives a gun with a speed of 400 meter per seconds. Calculates the kinetic energy of the bullets. From the question, the bullet has mass 50 gram, which we are expected to convert is to kilogram. A...”
Heat and Temperature
This lesson covers the definitions of heat and temperature, their differences, and the effects of heat on substances. It explains the kinetic molecular theory and how heat causes changes in state, such as solid to liquid and liquid to gas.
- 07:05 “There is always an increase in temperature. And this increase in temperature leads to the increase in the average kinetic energy of the molecules. The pressure of a container is determined by the number of times gas mole...”
- 02:21 “Heat can go from hot to cold, but temperature rises when heated and fall when cold. Heat is also measured with caloriminter. White temperature is measured with thermometer. The total kinetic energy and potential energy o...”
- 06:18 “They occupy larger spaces than solid and liquid. So they are free to move around. And the force of attraction between them is weaker. Compared to the last space between them. And that force is weaker compared to that of...”