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Questions

Explanations

6  Which list of elements contains a metal, a metalloid, and a nonmetal?

(1)     Ag, Si, I₂         (3) K, Cu, Br₂

(2)     Ge, As, Ne      (4) S, C1₂, Ar

metalloids on staircase..not Al

nonmetals..rightside..not group 18

7 What is the charge of the nucleus of a copper atom ?

(1)     +1      (3)     +29

(2)     +2      (4)     +64

so the charge is +29

8       At STP, O₂(g) and O₃(g) have different properties because

O₃(g) has

(l)      more dense nuclei than in O₂(g)

(2)     more protons per atom than in O₂(g)

(3)     molecules with a different structure than in O₂(g)

(4)     molecules with fewer covalent bonds than in O₂(g)

9       A compound is a substance composed of two or more elements that are

(l)      physically mixed in a fixed proportion

(2)     physically mixed in a variable proportion

(3)     chemically combined in a fixed proportion

(4)     chemically combined in a variable proportion

10     Which element has the highest boiling point at standard pressure?

(1) Mg  (2) Na   (3)  Rb   (4) Sr

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-55
 Questions 56-57 Questions 58-59 Questions 60-61 Questions 62-65  Questions 66-68  Questions 69-72  Questions 73-77 Questions 78-79 Questions 80-82 Questions 83-85