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13 Cards in this Set

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Law of Conservation of Mass

Matter is not created or destroyed, only changed. The number of atoms in the reactants must be equal to the number of atoms in the product.




Zn + 2HCl --> ZnCl₂ +2H

Chemical Equation

A combination of chemical formulas used to describe what happens in a chemical reaction. The equation identifies the reactants and resulting products.




2H + 2O --> 2H₂O₂

Reactant

Formulas written on the left side of the arrow symbol ( -> ) are the starting substances in a chemical reaction.




2CO --> 2C + 2O₂

Yields

An arrow symbol that shows a reaction has taken place. The reactants have reacted to produce a new substance ( the product ).




H₂ + O₂ --> H₂O₂

Product

Formulas written on the right side of the arrow symbol ( -> ) are the new substances formed in a chemical reaction.




2Fe + O₂ --> 2FeO

Subscript

A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance. No subscript means there is only one atom present.




CO

Coefficient

A number written in front of a chemical formula to show how many molecules of that substance are present.




2Na + 2Cl --> 2NaCl

Physical Change

A change in which the characteristics of a substance are only changed physically and the original properties stay the same.




dissolving, shape, size,

Chemical Change

A change in which a substance (or substances) is changed into one or more new substances with different properties than the original substances.




burning, corrosive, rusting

Symbol(s)

One or two letters used to represent an element.




H, Ne, O

Compound

A substance composed of two or more elements chemically combined and in a definite proportion.




H₂O, CO₂, CO

Chemical Formula

When substances interact to form one or more new substances with different properties than the original substance.




NaCl, H₂O, H₂O₂

Chemical Reaction

When substances interact to form one or more new substances with different properties than the original substances.




H₂ (gas) + O (gas) --> H₂O (liquid)