مصادر الكيمياء موقع لتعليم الكيمياء بصورة مبسطة
The scientific method: To understand a given phenomenon.
Steps in scientific method
1- Making observation
- Qualitative : no numbers
Example: The sky is blue and water is liquid
- Quantitative (called measurement): number+ unit Example: Water boils at 100 °C
2- Formulating hypothesis
Hypothesis is a possible explanation for an observation
3- Performing experiments to test hypothesis:
To gather new information that enable a scientist to decide whether the hypothesis is valid.
Theory (Model): Is asset of tested hypothesis that gives overall explanation of some natural phenomenon.
Observation versus theory
Observation: something that is witnessed.
Theory: interpretation (a possible explanation of why nature behaves in particular way).
Natural law versus theory
Natural law: is a summary of observed (measurable) behaviours (example: law of conservation of mass).
Theory: explanation of behaviour.