Children have problems understanding to recognize that structure should use. The formulas may or may not use functions, so sometimes the student confuses these concepts. On the other hand, students usually have difficulty in identifying the structure of the database, essential to be able to use it.

# Archives

# Understanding the practical application

Os alunos têm dificuldade de entender a terminologia adequada para discutir diferentes conceitos e aplicá-los em situações práticas.

Como robôs industriais podem ser programados a partir do zero, trabalhando com este tipo de autômatos é mais exigente do que trabalhar com um autômato que é um aspirador de pó ou uma máquina de lavar. O aluno precisa entender que um robô tem sensores e, em seguida, dependendo do tipo de robô que pode responder com uma tela com um telefonema ou outra opção.

# Numbers written in scientifical notation

In activities that imply the knowledge of the concept 'Mole', students have abstraction difficulties when numbers are gigantic. Scientific notation is a prerequisite here, and students have difficulty in understanding numbers represented in scientific notation such as the number . The representation of numbers in scientific notation is an obstacle when student needs to resolve exercises or solve problems involving the concept of 'Mole'. Students have difficulties at a mathematical level when, for example, needs to write the number 56000000000000 in scientific notation .

# neutralisation as the breakdown of an acid

Students think that neutralisation is a change in acid, not a change in the number of molecules etc.

# difference between strong and weak acids

students cannot explain why some acids are weaker than others (re Ph value?)