CHEM 101A Chapter Notes - Chapter lec 8: Chemical Equation, Balance Equation, Reagent

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chocolateferret587

18 Oct 2016

School

University of Arizona

Department

Chemistry

Course

CHEM 101A

Professor

Laura Van Dorn

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Document Summary

Chemical equation is an expression that uses chemical formulas and other symbols to illustrate what reactants constitute the starting materials in a reaction and what products are formed. Written with reactants on the left and products on the right and separated by a horizontal arrow (reactant arrow) Show number of molecules of a given element or compound that react or are formed. If there is a coefficient and a subscript (2co2- 2 carbon dioxide) multiple subscript and coefficient together to get number of atoms (2co2 will have 2 carbon and 4 oxygen atoms) Atoms cannot be created or destroyed in a chemical reaction. Number of atoms of each element in the reactants must be the same number of atoms in the product. Delta used when heat is needed for a reaction to occur. Gas (g) (aq) aqueous solutions- reactant dissolved in water. Combination reaction is joining of two or more reactants to form single product.

Related Questions

Which of the following statements about chemical equations is(are) true?

a. When balancing a chemical equation, you can never change the coefficient in front of any chemical formula.

b. The coefficients in a balanced chemical equation refer to the number of grams of reactants and products.

c. In a chemical equation, the reactants are on the right and the products are on the left.

d. When balancing a chemical equation, you can never change the subscripts of any chemical formula.

e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation.

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Which of the following statements is true about chemical reactions?

a. When balancing a chemical equation, you can never change the coefficient in front of any chemical formula.

b. The coefficients in a balanced chemical equation refer to the number of grams of reactants and products.

c. In a chemical equation, the reactants are on the right and the products are on the left.

d. When balancing a chemical equation, you can never change the subscripts of any chemical formula.

e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation.