CHEM 2070 Chapter Notes - Chapter 3: Lanthanide, Plus And Minus Signs, Krypton

151 views3 pages

fuchsiadog160

1 Sep 2016

School

Department

Course

Professor

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

Document Summary

Chem 2070 chapter 3 the periodic table and chemical periodicity. Left to right arrow separates reactants from products. A chemical equation must be balanced: law of conservation of mass. Individual atoms of various types are neither created nor destroyed: balanced chemical equation. Number of each type of atom remains the same in a chemical reaction. Balancing by inspection: adjust coefficients of chemical formulas on each side of the arrow. Balancing chemical equations algebraically: set variable relationships, ana + bh2o cnaoh + dh2, a=c, 2b=c + 2d, b=c, set a=1 (or any value, solve and substitute back into equation, make coefficients whole numbers. Elements can be grouped according to chemical properties: alkali metals. Lithium, sodium, and potassium have similar chemical properties=group. Hydroxides of these metals are alkaline: form corrosive aqueous solutions that feel slippery and react with acids, react with acids, alkali-earth metals. Magnesium, calcium, strontium, and barium have common chemical properties. Compounds occur in alkaline soil deposits: halogens.

Related Questions

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.

indigolouse566

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.