for the elements family shown mathematically below in the right of the questions, the melting point decreases as one goes down the family. under the following three elements with that the current melting point trend is submitted: element a (m.p. = 3450°c), element b (m.p. = 937°c), element c (m.p. = 1417°c).
84. in which of the three positions does element a belong?
a. top b. middle c. bottom
85. in which of the three positions does element b belong?
a. top b. middle c. bottom
86. in which of the three positions does element c belong?
a. top b. middle c. bottom
87. “yellow” is most closely associated with which of the following categories of elements?
a. metal b. nonmetal
88. “shiny” is most closely associated with which of the following categories of elements?
a. metal b. nonmetal
89. “pipe wrench” is most closely associated with which of the following categories of elements?
a. metal b. nonmetal
90. “brittle” is most closely associated with which of the following categories of elements?
a. metal b. nonmetal
91. the covalent compound of₂ is correctly named as:
a. oxygen monofluoride b. oxygen difluoride c. oxygen trifluoride
92. the covalent compound sbr₄ is correctly named as:
a. sulfur tetrabromide b. sulfur pentabromide c. sulfur hexabromide
93. the covalent compound co is correctly named as:
a. carbon monoxide b. carbon dioxide c. carbon trioxide
94. the covalent compound seo₃ is correctly named as:
a. selenium monoxide b. selenium dioxide c. selenium trioxide
95. the ionic compound babr₂ is correctly named as:
a. barium bromide b. barium bromine c. barium bromate d. barium bromit

Question

for the elements family shown mathematically below in the right of the questions, the melting point decreases as one goes down the family. under the following three elements with that the current melting point trend is submitted: element a (m.p. = 3450°c), element b (m.p. = 937°c), element c (m.p. = 1417°c).
84. in which of the three positions does element a belong?
a. top  b. middle  c. bottom
85. in which of the three positions does element b belong?
a. top  b. middle  c. bottom
86. in which of the three positions does element c belong?
a. top  b. middle  c. bottom
87. “yellow” is most closely associated with which of the following categories of elements?
a. metal  b. nonmetal
88. “shiny” is most closely associated with which of the following categories of elements?
a. metal  b. nonmetal
89. “pipe wrench” is most closely associated with which of the following categories of elements?
a. metal  b. nonmetal
90. “brittle” is most closely associated with which of the following categories of elements?
a. metal  b. nonmetal
91. the covalent compound of₂ is correctly named as:
a. oxygen monofluoride  b. oxygen difluoride  c. oxygen trifluoride
92. the covalent compound sbr₄ is correctly named as:
a. sulfur tetrabromide  b. sulfur pentabromide  c. sulfur hexabromide
93. the covalent compound co is correctly named as:
a. carbon monoxide  b. carbon dioxide  c. carbon trioxide
94. the covalent compound seo₃ is correctly named as:
a. selenium monoxide  b. selenium dioxide  c. selenium trioxide
95. the ionic compound babr₂ is correctly named as:
a. barium bromide  b. barium bromine  c. barium bromate  d. barium bromit

Accepted Answer

### Question 84
# Brief Explanations:
The problem states that in the element family, the melting point decreases as one goes down. Element A has the highest melting point ($3350^\circ\text{C}$) among A, B, and C. So the element with the highest melting point should be at the top (since melting point decreases down the family).
# Answer:
A. top

### Question 85
# Brief Explanations:
Given the melting point trend (decreases down the family), Element B has a melting point of $917^\circ\text{C}$, which is between Element A ($3350^\circ\text{C}$) and Element C ($1417^\circ\text{C}$)? Wait, no, wait: Element A: $3350^\circ\text{C}$, Element B: $917^\circ\text{C}$, Element C: $1417^\circ\text{C}$? Wait, no, maybe I misread. Wait, the problem says "the melting point decreases as one goes down the family". So higher melting point is at the top, lower at the bottom. So Element B has $917^\circ\text{C}$, Element C has $1417^\circ\text{C}$, Element A has $3350^\circ\text{C}$. So order from top to bottom (melting point decreasing): A (highest) at top, C (middle) at middle, B (lowest) at bottom? Wait, no, $3350 > 1417 > 917$. So A (top), C (middle), B (bottom). Wait, but question 85 is about Element B. So Element B has the lowest melting point, so it should be at the bottom? Wait, no, the options are top, middle, bottom. Wait, maybe I made a mistake. Let's re-express: melting point decreases down the family. So the top position has the highest melting point, bottom has the lowest. So Element A: $3350^\circ\text{C}$ (highest) → top. Element C: $1417^\circ\text{C}$ (middle) → middle. Element B: $917^\circ\text{C}$ (lowest) → bottom. So question 85: Element B belongs to bottom? Wait, but the options for 85 are A. top, B. middle, C. bottom. So answer C? Wait, but maybe I misread the melting points. Let me check again: "Element A (m.p. = $3350^\circ\text{C}$), Element B (m.p. = $917^\circ\text{C}$), Element C (m.p. = $1417^\circ\text{C}$)". So $3350 > 1417 > 917$. So order from top (highest m.p.) to bottom (lowest m.p.): A (top), C (middle), B (bottom). So Element B is at bottom. So question 85 answer: C. bottom. Wait, but let's confirm. The family has three positions: top, middle, bottom. Melting point decreases down, so top has highest m.p., bottom lowest. So A (highest) → top, C (middle m.p.) → middle, B (lowest m.p.) → bottom. So yes, Element B is at bottom.
# Answer:
C. bottom

### Question 86
# Brief Explanations:
As per the melting point trend (decreases down the family), Element C has a melting point of $1417^\circ\text{C}$, which is between A ($3350^\circ\text{C}$) and B ($917^\circ\text{C}$)? Wait, no, $3350 > 1417 > 917$. So the middle position (between top and bottom) has the middle melting point. So Element C has $1417^\circ\text{C}$, which is between A (highest) and B (lowest). So Element C belongs to the middle position.
# Answer:
B. middle

### Question 87
# Brief Explanations:
Nonmetals can have various colors, and "yellow" is a color often associated with nonmetals (e.g., sulfur is a yellow nonmetal). Metals are generally shiny, malleable, etc., and not typically yellow (except for gold, but gold is a metal, but most metals are silver/gray). However, the question is which category "yellow" is most closely associated with. Nonmetals like sulfur are yellow, so the answer is B. nonmetal.
# Answer:
B. nonmetal

### Question 88
# Brief Explanations:
Metals are known for their shiny (lustrous) appearance due to the presence of free electrons that reflect light. Nonmetals are generally dull. So "shiny" is most closely associated with metals.
# Answer:
A. metal

### Question 89
# Brief Explanations:
Metals are malleable and ductile, and tools like pipe wrenches are made from metals (which are strong and can be shaped). Nonmetals are brittle and not suitable for making tools that require strength and malleability. So "pipe wrench" is associated with metal.
# Answer:
A. metal

### Question 90
# Brief Explanations:
Nonmetals are generally brittle (they break easily when force is applied), while metals are malleable and ductile. So "brittle" is most closely associated with nonmetals.
# Answer:
B. nonmetal

### Question 91
# Brief Explanations:
For covalent compounds, we use prefixes to indicate the number of atoms. In $OF_2$, there is 1 oxygen and 2 fluorines. The prefix for 1 is "mono-" (but we don't use "mono-" for the first element if there's only one), and for 2 is "di-". So it's oxygen difluoride (since oxygen is first, fluorine is second, and we use "difluoride" for 2 fluorine atoms).
# Answer:
B. oxygen difluoride

### Question 92
# Brief Explanations:
In $SBr_4$, there is 1 sulfur and 4 bromines. The prefix for 4 is "tetra-". So the name is sulfur tetrabromide.
# Answer:
A. sulfur tetrabromide

### Question 93
# Brief Explanations:
In $CO$, there is 1 carbon and 1 oxygen. The prefix for 1 is "mono-" (used for the second element if there's only one). So it's carbon monoxide (not dioxide, which would be $CO_2$, or trioxide $CO_3$).
# Answer:
A. carbon monoxide

### Question 94
# Brief Explanations:
In $SeO_3$, there is 1 selenium and 3 oxygens. The prefix for 3 is "tri-". So the name is selenium trioxide.
# Answer:
C. selenium trioxide

### Question 95
# Brief Explanations:
For ionic compounds, we name the cation first (barium, $Ba^{2+}$) and then the anion. The anion here is bromide ($Br^-$), since $BaBr_2$ is formed from $Ba^{2+}$ and $Br^-$ (2 bromide ions to balance the +2 charge of barium). Bromine is the element, bromate is $BrO_3^-$, bromite is $BrO_2^-$. So the name is barium bromide.
# Answer:
A. barium bromide

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