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Intro. to Chemistry. What is Chemistry? The study of the composition and changes of matter.

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Presentation on theme: "Intro. to Chemistry. What is Chemistry? The study of the composition and changes of matter."— Presentation transcript:

1 Intro. to Chemistry

2 What is Chemistry? The study of the composition and changes of matter.

3 What is Matter? – All living and nonliving things – Anything with mass – Anything that takes up space What isn’t Matter? – Energy (light, waves, etc)

4 Areas of Study Organic Chemistry – – The study of all chemicals containing carbon. – Ex. Living things

5 Areas of Study Inorganic Chemistry – The study of chemicals that do NOT contain carbon. – Ex. Studying rocks (non-living)

6 Areas of Study Biochemistry – The study of the chemical processes that take place in organisms – Ex. Muscle contraction and digestion.

7 Areas of Study Analytical Chemistry – The area of study that focuses on the composition of matter. – Ex. Amount of lead in drinking water.

8 Areas of Study Physical Chemistry – The study that deals with the mechanism, the rate, and the energy of chemical changes.

9 How do we describe matter? Matter has extensive properties. Extensive properties are properties that depend on the amount of matter in a sample. – Examples: Mass Volume Length

10 Matter has intensive properties. Intensive properties are properties that depend on the type of matter in a sample, NOT the amount. – Examples: Hardness Shape Luster Malleability Ductility Conductivity Melting/Freezing Point Color Odor

11 Matter has physical properties. Physical properties identify the substance without changing it. – Examples: Physical State (solid, liquid, gas) Color Melting Point Boiling Point

12 Matter has chemical properties. Chemical properties identify the substance as it chemically reacts. – Examples during a reaction: Rusting Burning Odor given off Temperature change

13 Matter can go through physical changes. – Change where type of substance does not change. – Reversible changes (sometimes irreversible) – Examples: Changes of state Changes of shape Changes of texture Breaking

14 Matter can go through chemical changes. – Changes where material becomes a new substance – Involves a chemical reaction – NOT usually reversible – Always involve reactants and products – Include processes such as: burning, exploding, rusting, corroding, fermenting, rotting – Evidence of chemical changes: Energy transfer Gas production Precipitate Change of color

15 Chemical Reactions Conserve Mass Law of conservation of mass - in chemical reactions mass is not created nor destroyed Mass of reactants = Mass of products CH 4 + 2O 2  CO 2 + 2H 2 O

16 Classifying Matter Matter can be classified as either a mixture or a pure substance.

17 Mixtures Heterogenous mixture: not uniform – Example: soup, salad dressing

18 Homogenous mixture: uniform – Homogenous mixtures are also known as solutions. – Examples: air, steel, nickel – Solution Examples: Salt water Beer Pop


20 Mixtures are only physical combined. We can separate them by the following: – Filtration-separate by size or state – Distillation-separated by boiling point

21 Classifying Matter Elements: – Metals – Nonmetals – Metalloids

22 Classifying Matter Compounds and Molecules: – Substance that contains 2 or more elements chemically combined in a fixed ratio.

23 Memorize common elements. Memorize the 7 diatomic molecules.

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