Chemistry.

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Presentation transcript:

Chemistry

What is Chemistry? Chemistry – study of the makeup, properties of a substance and changes they undergo WHY?

What is a chemical? Sugar Water Blood IN TERMS OF CHEMISTRY – ANYTHING CONTAINING MATTER IS A CHEMICAL

Branches Organic Inorganic Physical Biochemistry substances with Carbon & Hydrogen Inorganic ALL things without Carbon Physical Study of properties, transformations and relationships between energy and matter Biochemistry All things occurring in living things

Qualitative vs. Quantitative Qualitative – Non Numerical descriptions Quantitative – Numerical descriptions

Using this data – we know about matter Anything that has mass and occupies space What is it made of?

The Atom Dalton – first model (1820s) Assigns weights to elements SOLID AND INDESTRUCTIBLE Thomson – Solid mass with negatives Blueberry Muffin model Rutherford – Gold Foil Experiment Names positive charged – Protons

HISTORY Rutherford Chadwick Knows Hydrogen is smallest Gives it atomic mass of 1 1 proton 1 electron Weight is still off? Chadwick Shoots particles at Parafin Wax Some protons bounce out? Neutrons – same mass as proton, no charge