An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)
What is 16 p, 15 n, 16 e
100
If the temperature is 38.0°F then what is the temperature in kelvins?
What is 276.5 degrees K
100
26) Which solution is the most acidic?
A. 1 × 10–4 M H+
B. 1 × 10–9 M H+
C. 1 × 10–3 M H+
D. 1 × 10–7 M H+
E. 1 × 10–10 M H+
What is C. 1 × 10–3 M H+
100
What is the wavelength of light having a frequency of 4.8 × 1014 s–1? (c = 3.00 x 108 m/s)
What is 630 nm.
100
An aluminum ion, Al3+, has how many protons and electrons
What is 13 protons and 10 electrons.
200
Isotope Isotopic Mass (amu) Abudance %
28Si 27.976927 92.22
29Si 28.976495 4.69
30Si 29.973770 3.09
Calculate the atomic mass of Si.
What is 28.0855 amu.
200
The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in pounds per cubic inch? (1 in = 2.54 cm; 1 lb = 454 g)
What is 0.491 lb/in^3
200
The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O. The molar mass of this compound is 284.5 g/mol. What is the molecular formula of the compound?
What is C18H36O2.
200
What is the mass, in grams, of one arsenic atom? (NA = 6.022 × 1023 mol–1)
What is 1.24 × 10–22 g
200
What formal charge resides on the carbon of CO32–?
What is 0.
300
Determine the number of electrons and identify the correct symbol for an atom with 17 protons and 18 neutrons.
What is 17 electrons, on board
300
How many lone pairs of electrons need to be added to complete this Lewis structure?
What is 8.
300
As a research assistant, you are asked to prepare a 3.00 liter solution of magnesium sulfate at 45.0 micromoles per liter. How many moles of magnesium sulfate are required to make this solution
What is 0.000135 moles.
300
21) Carbon uses ______ hybrid orbitals in ClCN.
What is sp.
300
Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =
What is 269.0 cm.
400
The effective nuclear charge for an atom is less than the actual nuclear charge due to
What is shielding.
400
The chemical formula for iron(II) nitrate is
What is Fe(NO3)2.
400
The distinguishing characteristic of all electrolyte solutions is that they
A. contain molecules.
B. conduct electricity.
C. react with other solutions.
D. always contain acids.
E. conduct heat.
What is B. conduct electricity.
400
For which one of the following molecules is the indicated type of hybridization not appropriate for the central atom?
A. BeCl2; sp2
B. SiH4; sp3
C. BF3; sp2
D. C2H2; sp
E. H2O; sp3
What is A. BeCl2; sp2
400
The shape of an atomic orbital is associated with
What is the angular momentum quantum number (l).
500
How does atomic radius change as you move across the periodic table?
What is atomic radius decreases moving from left to right across a period and increases from top to bottom.
500
What types of intermolecular forces exist between hydrogen fluoride molecules?
I. London forces
II. dipole-dipole interactions
III. hydrogen bonding
IV. ion-dipole interactions
What is I, II, and III
500
Which process defines how molecular compounds form ions upon dissolution?
What is ionization.
500
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/mL at the temperature of the measurement.)
What is 1.840 g/cm3
500
14) Which of these ionic solids would have the largest lattice energy?
A. NaCl
B. NaF
C. CaBr2
D. CsI
E. CaCl2