Question

name:

1. a lab procedure instructs you to measure 35 ml of tap water, what piece of glassware should you use?

a. 100 ml beaker
b. 100 ml erlenmeyer flask
c. 100 ml funnel
d. 100 ml graduated cylinder

1. to draw a lewis structure, one must know the...

a. number of valence electrons in each atom.
b. atomic mass of each atom.
c. bond length of each atom.
d. ionization energy of each atom

1. what is the formula for silicon dioxide?

a. sio
b. so₂
c. si₂o₂
d. sio₂

1. what is the formula for aluminum hydroxide?

a. (al)(oh)
b. aloh
c. al₃oh
d. al(oh)₃
e. aloh₃

1. the elements that are good conductors of electricity are...

a. nonmetals
b. gases
c. metals
d. metalloids

1. a(n) __________ is the smallest, individual particle of an element.

a. compound
b. atom
c. molecule
d. mixture

1. what is 9,520,000 in correct scientific notation?

a. 95.2 × 10⁻⁵
b. 95.2 × 10⁵
c. 9.52 × 10⁻⁶
d. 9.52 × 10⁶

1. the elements of the __________ group satisfy the octet rule without forming compounds.

a. main
b. noble gas
c. alkali metal
d. alkaline - earth metal

1. which is a transition metal with the lowest atomic number?

a. cd (48)
b. ge (32)
c. po (84)
d. cr (24)
e. mg (12)

1. which one of the following is a halogen?

a. li
b. br
c. p
d. ar
e. b

Explanation:

1. Q82: Graduated cylinders are designed specifically for accurate volume measurements of liquids, unlike beakers/Erlenmeyer flasks (for holding/mixing) and funnels (for transferring).
2. Q83: Lewis structures are built using valence electrons to form bonds and lone pairs around atoms.
3. Q84: Silicon has a +4 oxidation state, oxygen has -2, so the neutral formula is $\text{SiO}_2$.
4. Q85: Aluminum has a +3 charge, hydroxide has a -1 charge, so three $\text{OH}^-$ ions balance one $\text{Al}^{3+}$.
5. Q86: Metals have free delocalized electrons that allow them to conduct electricity well.
6. Q87: An atom is the smallest unit of an element that retains the element's chemical properties.
7. Q88: Scientific notation requires a coefficient between 1 and 10, moving the decimal 6 places left from 9,520,000 gives $9.52 \times 10^6$.
8. Q89: Noble gases have full valence electron shells, so they are stable and rarely form compounds.
9. Q90: Chromium (24) is a transition metal, while Ge is a metalloid, Po is a post-transition metal, Cd has a higher atomic number, Mg is an alkaline earth metal.
10. Q91: Bromine ($\text{Br}$) is in group 17, the halogen group.

Answer:

1. 82. d. 100 mL graduated cylinder
2. 83. a. number of valence electrons in each atom.
3. 84. d. $\text{SiO}_2$
4. 85. d. $\text{Al(OH)}_3$
5. 86. c. Metals
6. 87. b. atom
7. 88. d. $9.52 \times 10^6$
8. 89. b. Noble gas
9. 90. d. Cr (24)
10. 91. b. Br