The Science of Chemistry Chapter – What is Chemistry?

Objectives/Warm-Up SWBAT distinguish between chemical and physical properties. SWBAT distinguish between chemical and physical properties. Describe the similarities and differences between melting a candle and burning a candle. Describe the similarities and differences between melting a candle and burning a candle.

What is Chemistry? What do you think chemistry is? What do you think chemistry is? Chemical – any substance with a definite composition Chemical – any substance with a definite composition Some natural and some artificial Some natural and some artificial

Chemicals Participate In… Chemical Reaction – the process by which 1 or more substances change to produce 1 or more different substances Chemical Reaction – the process by which 1 or more substances change to produce 1 or more different substances

Chemicals exist in a physical state What are the 3 physical states of matter? What are the 3 physical states of matter? States of Matter – the physical forms of matter which are solid, liquid, gas, and plasma States of Matter – the physical forms of matter which are solid, liquid, gas, and plasma What are the differences between them? What are the differences between them?

One Classification of Matter: Phases Bottle A: Bottle A:GAS Bottle B: Bottle B:LIQUID Bottle C: Bottle C:SOLID

Fill out chart for the 3 states of matter SolidLiquidGas Shape Volume Particle Movement

Changes of Matter Physical Change – the identity of the substance does not change Physical Change – the identity of the substance does not change ~ it is still the same compound ~ tearing paper ~ change of state ~ sugar mixing with tea

Changes of Matter Chemical Change – identity of substance changes and a new substance is formed Chemical Change – identity of substance changes and a new substance is formed Fe + O 2  FeO Iron Rusting Fe + O 2  FeO Iron Rusting A leaf decaying A leaf decaying

Reactions Reactant – a substance or molecule that participates in a chemical reaction Reactant – a substance or molecule that participates in a chemical reaction Product – a substance that is formed during a chemical reaction Product – a substance that is formed during a chemical reaction  is a yield sign and it indicates the direction of a rxn  is a yield sign and it indicates the direction of a rxn

Evidence of a Chemical Change 1. Evolution of gas 2. Formation of precipitate 3. Evolution or absorption of Energy 4. Color change in reaction system

Is it Physical or Chemical? ChangePhysicalChemical Melting cheese Burning wood Milk souring Wadding up paper Bicycle rusting

Word Sort Activity Please work with the person sitting next to you to categorize the processes written on the slips contained in the envelope as physical or chemical processes. Please work with the person sitting next to you to categorize the processes written on the slips contained in the envelope as physical or chemical processes.

Questions 1. Describe the motion of particles in the 3 common states of matter. 2. Explain why gasses and liquids do not have permanent shapes.

Assignment Copy the vocabulary words and their definitions for chapter 1 in your notebook-Due Friday. Copy the vocabulary words and their definitions for chapter 1 in your notebook-Due Friday.