CHEM 110 Lecture 10: Chapter 10

82 views10 pages

ceruleanwolf285

1 Oct 2017

School

Simon Fraser University

Department

Chemistry

Course

CHEM 110

Professor

Jennifer Pore

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Mass is neither created nor destroyed in any ordinary chemical reactionatoms are neither created nor destroyed in any ordinary chemical reaction. A chemical reaction involves the union, separation and or rearrangement of atoms to create one or more new substances. Reactants/reagents: substances before the chemical reaction, starting materials. Use of formula and symbols to describe changes taking place during a chemical reaction e. g. combustion reaction. Word description: methane reacts with oxygen to produce carbon dioxide and water chemical equation: Symbols (s) solid (g) gas (l) liquid (aq) dissolved in water - aqueous solution. Balancing chemical equations: mass must be conserved, same number and types of atoms on both sides of the equation, formula subscripts must not be changed, final balanced equation must contain whole number coefficients. Ch4 + o2 co2 + h2o: choose one atom at a time and balance each one, use whole number coefficients. 4a + 6b 2a2b3 divide through by 2.

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.

periwinklepug98

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.