conversions & calculations
atoms & formulas
stoichiometry& redox
quantum fun!
bonding
100
Calculate the volume occupied by 469g of acetone where the density of acetone is 0.7857g/mL.
597mL
100
How many protons, neutrons, and electrons does a selenium anion have?
protons = 34 / neutrons = 45 / electrons = 36
100
What mass of Al is required to react completely with 25.0g manganese oxide in the following chemical reaction?
3MnO₂ + 4Al → 3Mn + 2Al₂O₃
10.3g Al
100
What is the correct sequence for the types of radiation on the electromagnetic spectrum in order of decreasing wavelength?
radio > microwave > IR > visible > UV > x-rays > gamma rays
100
Which atom in the N-H bond has the 𝜹⁺?
H
200
Convert 117°F to °C.
47.2°C
200
A chemical oxygen generator can be used in oxygen-supply systems of aircraft, space stations, and submarines. The oxygen generator is composed of ClO₃⁻ ionically bonded to K⁺. What is the chemical name for this compound?
potassium chlorate
200
Consider the following balanced chemical equation:
3FeCl₂ + 2Na₃PO₄ → Fe₃(PO₄)₂ + 6NaCl
If 23.0g FeCl₂ and 41.0g Na₃PO₄ are mixed to form Fe₃(PO₄)₂ and NaCl, what is the limiting reactant?
FeCl₂
200
The blue color of the sky results from the scattering of sunlight by air molecules.. What is the wavelength (in nm) of blue light that has a frequency of 6.69x10¹⁴s⁻¹?
448nm
200
What is the correct Lewis structure of phosphate?
300
If there are 5.88x10²¹ atoms present in a sample, how many grams of octane are there? (octane = C₈H₁₈)
1.12g
300
Determine the correct formula for mercury (II) oxide.
HgO
300
If 0.56g of CuCl₂ and 0.64g of KI react, how many moles of I₂ are formed in the following reaction?
2CuCl₂ + 4KI → 2CuI + 4KCl + I₂
0.00096mol
300
What is the condensed (noble gas) electron configuration for Silver (Ag)?
[Kr]5s¹4d¹⁰
300
How many valence electrons are in phosphate?
32
400
How many grams are in 1.26x10⁻⁴mol of HC₂H₃O₂ (acetic acid)?
7.57x10⁻³g
400
What is the correct IUPAC name for H₂SO₄(aq)?
sulfuric acid
400
How many moles of KBrO₃ are required to produce 0.700 moles of Br₂ according to the following reaction:
KBrO₃ + 5KBr + 6HNO₃ → 6KNO₃ + 3Br₂ + 3H₂O
0.0233mol
400
What is the complete electron configuration for silver (Ag)?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹4d¹⁰
400
Determine the electron geometry and molecular geometry of the central atom in ClF₃.
500
Perform the following mathematical operations, and express the result to the correct number of significant figures.
(3.8x10⁻¹² + 4.0x10⁻¹³)/(4.0x10¹² + 6.3x10¹³)
6.3x10⁻²³
500
Sapphires are composed of Al³⁺ and O²⁻ ions. What is the formula if these two ions were to bind together?
Al₂O₃
500
What is the reducing agent in the following reaction?
3Al(s) + 3NH₄ClO₄(s) → Al₂O₃(s) + AlCl₃(s) + 3NO(g) + 6H₂O(g)
Al(s)
500
A metal alloy of unknown composition was bombarded with 204 nm photons to determine its photoelectric properties. Electrons photo-ejected from this alloy had a velocity of 7.00 × 10⁵ m/s. What is the work function, Φ, of this alloy in eV? (1 eV = 1.60 × 10⁻¹⁹ J, the mass of an electron is 9.109 x 10⁻³¹ kg, and Planck's constant is 6.626 x 10⁻³⁴ Js.)
4.70eV
500
Based on the orbital filling configurations, predict whether N2+ , N2 , or N2- would have the strongest bond.
N₂
