Chapter 1 Introduction Chemistry 101. Chemistry and our life.

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Presentation transcript:

Chapter 1 Introduction Chemistry 101

Chemistry and our life

Chemistry Chemistry: science that deals with materials and their changes. Central Science All sciences are connected to chemistry.

Chemical change (chemical reaction): substance(s) are used up (disappear) → other forms burning a paper or cooking an egg Physical change: identities of the substances do not change. (change of state) evaporation of water or melting Changes

How do you solve a problem? 1.Recognize the problem: Observation 2.Propose possible solutions: Hypothesis 3.Decide which of the solutions is the best: Experiment

Scientific method 1. Fact: is a statement based on direct experience (observation). Qualitative observation: Water is liquid. Quantitative observation: water boils at 100°C. Measurement State the problem and collect data.

2. Hypothesis: is statement that is proposed to explain the observation. (without actual proof) Scientific method 3. Experiment: performing some tests to prove hypothesis. (find a proof)

4. Theory (model): is a set of tested hypotheses. Serendipity: Observation by chance Scientific method We have a stronger belief in it because of more evidence supports it. Law: is a summery of observed behavior. We formulate this observations.

Some points about chemistry We Should learn the language of chemistry. Think and trust yourself to figure things out. It is no disaster to make a mistake as long as you learn from it. Practice and help each others. Be patient.

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