uwsp chem 105 midterm review

From quiz 3 Q. 5: how many carbon atoms are in the phenylalanine structure?

9

Quiz 3 Q. 6: which of the following functional groups is present in the phenylalanine structure?

carboxylic acid

the polyatomic ion C(NH2)3^+

24

The ions Ca^2+ and PO4^-3 form an ionic compound with the formula

Ca3(PO4)2

_________ bonds are formed by sharing electrons, while _________ bonds are formed by electrostatic attraction between ions

covalent, ionic

Quiz 3 Q. 7: how many lone pairs of electrons are present around the circled N atom?

1

which of the following compounds would you expect to contain ionic bonds?

CaO

based on the octet rule, magnesium will form the _______ ion

Mg^2+

the correct name for N2O5 is

dinitrogen pentoxide

what is the empirical formula for C8H16O4

C2H4O

Quiz 3 Q. 14: what is the formal charge on the phosphorous atom?

0

Quiz 3 Q. 15: including the structure above, how many equivalent resonance structures exist for the phosphate ion?

4

what is the empirical formula of a substance that contains 5.28g of C, 1.11 g of H, and 3.52 g of O?

C2H5O

in a single reasonable Lewis dot structure, the polyatomic ion [CO3]^2- has _____ double bonds, _____ single bonds, and _____ lone pair(s) around the central atom

1,2,0

Identify the ionic charge on Cr in the following compound: Cr2O3

3

a double bond consists of ______ pair(s) of electrons

2

what is the expected valence for the P atom

3

Quiz 2 Q. 1: which atom would you expect to have the successive ionization energies shown below?

Si

of the following, which gives the correct order for atomic radius for Mg, Na, P, and Si?

Na > Mg > Si > P

the _______ quantum number describes the shape of an orbital

angular momentum

Quiz 2 Q. 4: the arrow labeled (1) in the figure below is an _______ process and the arrow labeled (2) in the figure below is an _______ process

emission, absorption

in a multielectron atom, which orbital will have the highest energy

3d

Quiz 2 Q. 6: an orbital diagram for nitrogen (N) is incorrectly drawn below. which of the following principles does the orbital diagram violate

Heisenberg uncertainty

an electron falls from the n=4 to n=2 shell in a H atom and releases light that appears blue-green with a wavelength of 486 nm. what is the energy of this photon in joules (J)?

4.09*10^-19J

The atomic radius of main-group elements generally increases down a group because _______

electrons are placed in successively higher shells

which set of quantum numbers best describes a 4p orbital?

4, 1, 0

Iodine is best classified as a ____________.

halogen

what is the wavelength of light (in nm) emitted from a traffic light having a frequency of 5.75*10^14s-1

521 nm

the 4d-subshell can accommodate a maximum of ______ electrons

10

Quiz 2 Q. 14: the image shown below represents a _______ orbital

p

which of the following atoms would you expect to have the largest first ionization energy?

Cl

how many total paired and unpaired electrons are in the 3d-subshell for the Ni atom?

6, 2

which of the following correctly represents the electron affinity of the phosphorus atom?

P (g) + e- -> P- (g)

Quiz 2 Q. 18: in the image below, the orbital with the highest subshell is _____

3s

the condensed electron configuration for the Si atom is [Ne]3s^23p^2. how many core and valence electrons would you expect the Si atom to have?

10, 4

which of the following is a valid set of four quantum numbers (n, l, ml, ms)?

2, 1, 0, +1/2

electrons have a _____ charge, while neutrons have a ______ charge.

negative, neutral

how many significant figures does the number 3.20*10^3 contain

3

in 2009, a team from Northwestern University reported the preparation of a new "spongy" material composed of Ni, Mo, and S that excels at removing mercury (Hg) from water. The density of this spongy material is 0.20 g/cm^3 and its surface area is 1750 m^2/g. calculate the total surface area (in m^2) for 9.2 mg of this material.

16

Nicotine (C10H14N2) is an addictive chemical that is found in tobacco. what is the molar mass (in g/mol) of the nicotine molecule?

162.236

the molecular formula of aspartame, the aritficial sweetener marketed as NutraSweet is C14H18N2O5. how many kilograms (kg) are in 25.0 mols of aspartame? (The molar mass of aspartame is 294.307 g/mol)

7.36

what atom or ion has 22 protons, 26 neutrons, and 21 electrons?

Ti+

Quiz 1 Q. 8: which of the following particulate images best describes as a homogeneous mixture?

b

Quiz 1 Q. 10: the mass of a rectangular block was determined to be 365.250 g and its length, width, and height are shown in the image below. what is the density (in g/cm^3) of this rectangular block reported to the correct number of significant figures?

2.60 g/cm^3

which of the following symbols best represents the units of nanoseconds?

ns

how many mols of oxygen are there in 0.125 moles of Ti2O3

0.375

Quiz 1 Q. 13: consider the solution shown below. ________ is/are the solvent(s) and _______ is/are the solute(s).

solvent = methanol; solute = potassium and iodide

what is the final concentration (in M) of a solution that was prepared by diluting 20.00 mL of a 0.125 M solution to a total of 100.00 mL?

0.0250

a substance that can't be chemically broken down into simpler substances is defined as?

an element

the atomic number (Z) is the number of _____ found in the nucleus of an atom?

protons

to convert from mols to volume, which of the following conversion factors should you use?

molarity

Quiz 1 Q. 20: based on the particulate level images shown below, which of the following solutions would you expect to have the highest concentration?

(ii)