Chemical Reactions

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Chemical Reactions

Chemical Reactions

Vocabularyreactant: a substance that undergoes a chemical reaction, often by combining with another substanceproduct: a substance that is formed in a chemical reactionendothermic reaction: a chemical reaction in which more energy is taken in than is given offexothermic reaction: a chemical reaction in which more energy is given off than is take informula: arrangement of symbols that shows both the kinds and number of atoms in a compoundchemical equation: an arrangement of symbols and formulas used to show what happens during a chemical reaction

Notes*Elements are the simplest form of matter.*Elements are divided into metals and nonmetals.*Each element contains only one kind of particle called an atom.*Each element has it's own set of properties.*The number of elements is more than 100.*All matter is made up of a combination of elements.*Water molecules are made up of one atom of oxygen and two atoms of hydrogen. (H2O)*Compounds are substances in which two or more elements are held together by a chemical bond. Sugar, salt, rust, and water are all compounds.*The properties of a compound always differ from the properties of the elements in it.

More Notes*Properties of a substance include its color, hardness, state and whether or not it will dissolve in water.*Compounds can be separated into their elements or combined with another compound to form new substances. The process by which new substances with new properties form is called a chemimcal reaction.*Elements can combine in different ways to form the compounds around you. *It takes energy to do work, to make things move, and to allow our bodies and machines to work the way they're supposed to.*During a chemical reaction you have to add energy to break bonds holding the atoms in the reactants together.*As atoms of elements come together to form compounds, energy is released.*Scientists use abbreviations for the names of elements. These abbreviations are called symbols. *The Law of Conservation of Mass, states that atoms are saved- or conserved- during a chemical reaction.

Chemical Reactionsantacids in water, food cooking, grass growing, cars rusting, wood burning, fingers healing, breakfast burning, bananas browning, brains thinking, matches burning, dynamite exploding, lightning bugs flashing

4 Kinds of Chemical Reactions1. Substances combine.2. A substance breaks apart.3. One element replaces another.4. Substances switch places.



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