Chem
Select the element with the most negative electron affinity (i.e., accepts an electron most readily).
F
Ferric oxide is used as a pigment in metal polishing. Which of the following is its formula?
Fe2O3(low exponent)
In the best Lewis structure for the fulminate ion, CNO-, what is the formal charge on the central nitrogen atom?
+1
What is the number of lone electron pairs on the central atom of a molecule having a molecular geometry of seesaw-shaped such as SF4(low)?
1
A patient in the hospital is running a temperature of 39.5°C, what is this in Fahrenheit?
103.1F
The S.I. prefixes milli- and mega- represent, respectively:
10^6 and 10^-6
Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?
117.9°C
What is the molar mass of nicotine, C10H14N2(low)
162 g/mol
How many dots does the Lewis dot symbol for magnesium have around it?
2
How many electrons are in a single bond?
2
The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h?
25,300 mi/h
The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mi = 1609 m)
25,300 mi/h
After carrying out the operations below, how many significant figures are appropriate to show in the result? (13.7 + 0.027) ÷ 8.221
3
In a single atom, what is the maximum number of electrons which can have quantum number n = 4?
32
Aluminum sulfate, Al2(SO4)3, is used in tanning leather, purifying water, and manufacture of antiperspirants. Calculate its molecular or formula mass.
342.15 amu
How many protons and electrons are present in one Br- ion?
35 protons 36 elections
What is the wavelength of radiation that has a frequency of 6.912 × 1014 s-1 (c = 3.0 × 108 m/s)?
4.337x10^2
The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?
5.5 x 10^-4 kg
A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg (h = 6.63 × 10-34 Js)?
7.29 × 10^-37 m
How many electrons are there in the second principal energy level (n = 2) of a phosphorus atom?
8
What is the name used to represent the number of protons in the nucleus of each atom of an element and is equal to the number of electrons outside the nucleus?
Atomic number
Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.
B
Which one of the following sets of quantum numbers is not possible?
B 3 2 -3 -1/2
Which one of these species is an ion?
B^3+
Which of the following is the empirical formula for hexane, C6H14?
C3H7
Which one of the following molecules is polar?
CHBr3
Which of these ionic solids would have the largest lattice energy?
CaCl2
Who discovered the subatomic particle having a neutral charge the neutron?
Chadwick
An anion is defined as
a charged atom or group of atoms with a net negative charge
What represents the exact number of atoms of each element in a molecule?
Molecular formula
A polar covalent bond would form in which one of these pairs of atoms?
P-Cl
Which ground-state atom has an electron configuration described by the following orbital diagram? [Ne]
Phosphorus
Which of these elements is most likely to exhibit an expanded octet in its compounds?
S
According to VSEPR theory, a molecule with the general formula AX4E2(low) will have a _____ molecular shape.
Square planar
What is the molecular shape of the IBr3(low) molecule?
T-shaped
Which of the following is a type of radioactive radiation which has no charge and is unaffected by external electric or magnetic fields?
V rays
What does VSEPR model mean?
Valence Shell Electron Pair Repulsion
Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation (c = 3.0 × 108 m/s; h = 6.63 × 10-34 Jxs).
between 10^-20 and 10^-19 J
Which of the following is a chemical change?
broiling a steak on a grill
The orbital diagram for a ground-state carbon atom is
d
Which of the following activities is not a part of good science?
indulging in speculation
A Born-Haber cycle applied to the formation reaction of an ionic solid
is an application of Hess's Law
Which of the following is an extensive property?
mass
Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy.
microwave, infrared, visible, ultraviolet
An electron in the n = 6 level emits a photon with a wavelength of 410.2 nm. To what energy level does the electron move?
n=2
A _________ is a point at which a standing wave has zero amplitude.
node
J. J. Thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. His results showed that
the charge was always a whole-number multiple of some minimum charge.
What is a unifying principle that explains a body of experimental observations?
theory
Rutherford bombarded gold foil with alpha (a) particles and found that a small percentage of the particles were deflected. Which of the following was not accounted for by the model he proposed for the structure of atoms?
total mass of the atom