English Chemistry

            At 09.30 AM The bell rang time for Ms. Nur to enter the class X IPA4 Ms. Nur : Morning all. How are you? All students: Morning Miss, i'm fine. Ms. Nur : Today we will learn about acids and bases. Does anyone know what is acid? Dina : Me miss, I think acid is a compound and have a pH < 7. Ms. Nur : Yes, that's right Dina. Then there is another bases, does anyone know what is a base? Ayu : Me miss, I think the base is a compound and have a pH > 7. Ms. Nur : Yes, it is true what is delivered ayu. Well, the theory of acids and bases that we will study there are three, theory according to Arrhenius, Bronsted-Lowry, and Lewis. According to the theory of Arrhenius acid is a substance which if dissolved in water will produce H ⁺ ions, whereas a base is a substance that if dissolved in water produces OHˉ ion. Lusi: Miss, Iam very compused how if the solution is not dissolved into the wat...

 40 Vocabulary in Chemistry 1. Element An element is a substance consisting of atoms which all have the same number of protons - i.e. the same atomic number. Elements are chemically the simplest substances and hence cannot be broken down using chemical methods. Elements can only be changed into other elements using nuclear methods. 2. Atom An atom is the smallest unit of matter that has the properties of an element . It is composed of a dense core called the nucleus and a series of outer shells occupied by orbiting electrons. The nucleus, composed of protons and neutrons, is at the center of an atom . 3. Synthesis Reaction A synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound.   4. Molecul A molecule is the smallest particle in a chemical element or compound that has the...

1. Magnesium      Discovery date 1755  Discovered by Joseph Black  Origin of the name The name is derived from Magnesia, a ...