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Transcript
Chemical Reactions Performance Expectations • MS-PS1-5. I can explain the conservation of mass through a model of chemical reactions. • MS-PS1-3 I can gather information to describe the origins and impacts of synthetic material What is a chemical reaction? • When elements and/or compounds interact to form new compounds • A new substance is made during a chemical reaction Chemical Equations • We use chemical equations to represent the chemical reaction with chemical formulas and numbers. 2 H2 + O2 2 H2O This is the chemical equation showing how hydrogen and oxygen react to make water Parts of a Chemical Equation Reactants and Products • Chemical reactions are read left to right. • The starting substances are called the reactants • The substance that is made as a result of the chemical reaction are called products 2 H 2 + O 2 2 H2 O Reactants Products Parts of a Chemical Equation Chemical Formulas • A chemical formula is a why to represent a substance. • Atomic Symbols- from the periodic table to represent the types of atoms in the substance • Subscripts- tell the number of each type of atom in a molecule 2 H 2 + O 2 2 H2 O H2 is the chemical formula for a hydrogen molecule. H2O is the chemical formula for a water molecule Parts of a Chemical Equation Coefficients • Coefficients tell us the proportions that the molecules need to react in. • They show how matter is conserved 2 H2 + O2 2 H2O The coefficient of 2 shows us that two molecules of hydrogen need to react for every 1 molecule of oxygen Not having coefficient is the same as saying 1 How Do I know a Chemical Reaction Happened • You may not be able to see the molecules but there are some signs that a reaction has occurred • Color Change • Creation of a New Gas • Change in Temperature • Smell • Light Vocabulary Pt II. Chemical formula A representation of a substance in which the elements are represented by their symbols and subscripts represent the number of atoms of each element H 2O Chemical change The formation of a new substance with different properties; cannot be undone by physical means Chemical equation A representation of a chemical reaction by symbols and numbers 2 H2 + O2 2 H2O Law of conservation of mass Matter is not created or destroyed; only rearranged Product Substance(s) resulting from a chemical reaction Reactant Substances that are combined and changed during a chemical reaction Element A substance made of only one kind of atom. Synthetic Made by human means and not originally found in nature.
