Four Arithmetic Operations of Positive and Negative Numbers: Priority of Math Calculations

After learning addition, subtraction, multiplication, and division for positive and negative numbers, students need to be able to calculate expressions that mix each of them. Addition, subtraction, multiplication, and division are collectively called the four rules of arithmetic. In mathematics, we study the four rules of arithmetic (four arithmetic operations). After learning about positive and […]

Positive and Negative Numbers: Multiplication, Division and Power

When learning negative numbers, many people get confused. This is because when you multiply or divide different signs, the signs change. In addition, when you multiply negative by negative, the sign becomes positive. Why does this happen? Few people can explain this reason. However, in order to understand mathematics, we need to solve the question […]

Aromatic Heterocyclic Compounds: Reactivity and Orientation

There are many types of compounds that have aromatic properties. All compounds are aromatic if they have a benzene ring in the molecule. However, there are aromatic compounds that are different from benzene rings. These are heterocyclic compounds. Aromatic heterocyclic compounds show aromaticity but have different properties from benzene rings. What should we pay attention […]