Match the questions and multiple choice. Principles of Chemistry I Midterm Lectu

Question

Match the questions and multiple choice.

Principles of Chemistry I Midterm Lecture Examination (A II. Matching Questions (Match the concepts below with the appropriate descriptions. Notice that the number of concepts is redundantly given.) (2 points each, 12 points in total) The concepts are molecule, atom, equilibrium, compound, element, cation, anion, Bronsted- Lowry acid, Bronsted-Lowry base, oxidation reaction, and reduction reaction. 7. An is the smallest particle of an element that retains the characteristic chemical properties of the element 8. In a reaction in which an atom gains electron(s) the reaction is referred to 9. If an atom loses an electron, the atom now has one fewer negative electrons than it has positive in the nucleus. The result is a positively charged ion called 10. A is the smallest discrete units that retain the composition and chemical characteristics of the compound. is the condition in which the forward and reverse reaction rates in a chemical system are equal 12. In acid-base reaction, an acid which is a proton donor is called III Multiple Choice Questions (2 points each, 12 points in total) 13. How many protons, neutrons, and electrons are in a yttrium-89 atom? a) 39 protons, 50 neutrons, 39 electrons b) 39 protons, 89 neutrons, 39 electrons c) 39 protons, 50 neutrons, 50 electrons d) 50 protons, 39 neutrons, 50 electrons e) 39 protons, 11 neutrons, 39 electrons Page 3

Explanation / Answer

Q7

smallest particle for elements --> must be ATOM, since it cant be divided

Q8

this must be reduction, since there is gain in electrons

Q9

the Cations are the positively charged species, Na+, Ca+2, La+3 are cations

Q10

a compound will maintain its compounds/characteristics

Q11

Equilibirum will state the forward/reverse reaction rates

Q12

proton donor must be an acid, since H+ increases

Q13

Yttrium has atomic number of 39

then

mass no = 89

neutrons = 89-39 = 50

choose

39 protons, 50 neutrons, 39 electrons

Q11

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