Science Chapter 1

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Science Chapter 1 by Mind Map: Science Chapter 1

1. Fuel-material that releases energy when is burns

2. Section 1

2.1. Matter may be in the form of elements, compounds, or mixtures

2.2. Chemical changes result in the formation of new substances. Physical changes do not

2.3. Color change, production of a gas or a precipitate. a change in temperature, or a change in the properties of a substance are all clues that a chemical reaction has taken place

2.4. Chemical reactions occur when chemical bonds are formed or broken

2.5. Key terms

2.5.1. Chemistry Study of the properties of matter and how matter changes

2.5.2. Element a substance that cannot be broken down intro any other substances by chemical or physical means

2.5.3. Compound a substance made of two of more elements chemically combined in a specific ratio, or proportion

2.5.4. Mixture two or more substances that are mixed together but not chemically combined

2.5.5. Solution a well-mixed mixture

2.5.6. Physical change a change that alters the form or appearance of a material but does not make the material into another substance

2.5.7. Chemical change a change in matter that produces a new substance

2.5.8. Chemical Reaction the process in which substances undergo chemical changes that results in the formation of new substances

2.5.9. Precipitate a solid that forms from a solution during a chemical reaction

2.5.10. Atom the smallest particle of an element

2.5.11. Molecule the combination of two or more atoms

2.5.12. Chemical Bond the force that holds atoms together

3. Section 2

3.1. Key Terms

3.1.1. Chemical Equation a short, easy way to show a chemical reaction, using symbols instead of words

3.1.2. Symbol a one or two letter set of characters that is used to identify elements

3.1.3. Chemical Formula a combination of symbols that represent the elements in a compound

3.1.4. Subscript a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in acompound

3.1.5. Reactants a substance that enters into a chemical reaction

3.1.6. Products a substance formed as a result of a chemical reaction

3.1.7. Conservation of Mass the principle stating that matter is not created or destroyed during a chemical reaction

3.1.8. Coefficient a umber in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction

3.1.9. Synthesis a chemical reaction in which two or more simple substances combine to form a new , more complex substance

3.1.10. Decomposition a chemical reaction that breaks down compounds into simpler products

3.1.11. Replacement Reaction a reaction in which one element replaces another in a compound; or when two elements in different compounds trade places

4. Section 3

4.1. Key Terms

4.1.1. Exothermic Reaction a reaction that releases energy in the form f heat

4.1.2. Endothermic Reaction a reaction that absorbs energy in the form of heat

4.1.3. Activation Energy the minimum amount of energy that has to be added to get a chemical reaction started

4.1.4. Concentration the amount of one material in a certain volume of another material

4.1.5. Catalyst a material that increases the rate of a chemical reaction by lowering the activation energy

4.1.6. Enzyme a biological catalyst that lowers the activation energy of reactions in cells

4.1.7. Inhibitor a material that decreases the rate of a reaction

5. Section 4

5.1. Combustion-a rapid reaction between oxygen and a substance called fuel

5.2. Three things are necessary to start and maintain a fire fuel,oxygen, and heat.

6. Ch1 section 1

6.1. Ice salt and all other materials in your are made of atoms. Atoms are so small it would take about two million to make a line across to the end of this period. Its amazing that things are so tiny are the buildings blocks of all substances in the universe.

6.1.1. An atom cosisits of a nucleaus surrounded by one or more electrons. The nuclearus is the tiny central core of an atom. It contain particles called protons and neutrons. Protons have positive charge and nuetrons have no charge they are nuetral.