Question 1

Which group on the periodic table contains elements that are highly reactive with water and are found in Group 1?

Accepted Answer

Alkali metals

Question 2

What is the correct atomic symbol for an atom with 38 protons, 50 neutrons, and 36 electrons?

Accepted Answer

$$^{88}_{38}\mathrm{Sr}^{2+}$$

Question 3

Which of the following best describes the location and relative mass of a neutron?

Accepted Answer

Located in the nucleus, mass ≈ 1.0 amu

Question 4

Which of the following elements would have the largest atomic radius?

Accepted Answer

Cs

Question 5

Rank the following elements from smallest to largest based on ionization energy: Li, Na, K, Rb.

Accepted Answer

Rb \u003c K \u003c Na \u003c Li

Question 6

Which of the following compounds is ionic?

Accepted Answer

Na$$_2CO$_3$$

Question 7

What is the energy required to heat 15g of aluminum from $$23^\circ\mathrm{C} to$$ $$145^\circ\mathrm{C}$$? (Specific heat of Al = $$0.897\ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$1600\ \mathrm{J}$$

Question 8

Which of the following is the correct electron configuration for Vanadium (V)?

Accepted Answer

$$[Ar] 4s^2$ 3d^3$

Question 9

Which of the following nuclear equations correctly represents the alpha decay of $$^{238}_{92}\mathrm{U}$$?

Accepted Answer

$$^{238}_{92}\mathrm{U} \$$rightarrow ^{234}$$_{90}\mathrm{Th} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 10

After 32 days, how much of a 58.9g sample of Iodine-131 (half-life = 8 days) remains?

Accepted Answer

3.68 g

Question 11

Which of the following best describes the shape of a p-orbital?

Accepted Answer

Dumbbell-shaped

Question 12

Which of the following is a property of noble gases?

Accepted Answer

They have a full valence shell

Question 13

Which of the following is the correct Lewis structure for methane (CH$$_4$$)?

Accepted Answer

A central C atom with four single bonds to H atoms

Question 14

Which of the following best describes the trend in atomic size across a period from left to right?

Accepted Answer

Atomic size decreases

Question 15

Which of the following is the correct formula for the carbonate ion?

Accepted Answer

$$\mathrm{CO}_3$$^{2-}$$

Question 16

Which of the following is a covalent compound?

Accepted Answer

CO$$_2$$

Question 17

What is the final temperature if 26.6 kJ of energy is added to 581g of copper starting at $$36^\circ\mathrm{C}$$? (Specific heat of Cu = $$0.385\ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$153^\circ\mathrm{C}$$

Question 18

Which of the following is the correct balanced nuclear equation for the beta decay of $$^{14}_{6}\mathrm{C}$$?

Accepted Answer

$$^{14}_{6}\mathrm{C} \$$rightarrow ^{14}$$_{7}\mathrm{N} $$+ ^{0}$$_{-1}\beta$$

Question 19

Which of the following best describes the electron geometry and molecular geometry of water (H$$_2O$$)?

Accepted Answer

EG: Tetrahedral, MG: Bent

Question 20

Which of the following is the correct order of increasing electronegativity for the elements B, Al, Ga, In?

Accepted Answer

In \u003c Ga \u003c Al \u003c B

CHEM 105 Test 2 Study Guide – Step-by-Step Guidance

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