CH 1 Basics
This law explains why two compounds formed from the same elements can have different mass ratios.
➡️ Answer: What is the law of multiple proportions?
A mass spectrum shows two peaks of nearly equal height at masses 79 and 81.
➡️ Answer: What is the element has two isotopes of similar abundance?
The maximum number of electrons in the n = 4 shell.
➡️ Answer: What is 32?
The correct name for N₂O₅.
➡️ Answer: What is dinitrogen pentoxide?
A bond formed by end-to-end overlap.
➡️ Answer: What is a sigma bond?
The formula relating molarity, moles, and volume.
➡️ Answer: What is M = mol / L?
The type of reaction where electrons are transferred (loss or gain)
➡️ Answer: What is a redox reaction?
The equation relating P, V, n, T.
➡️ Answer: What is PV = nRT?
A gas occupies 4.00 L at 1.00 atm. The pressure increases to 2.00 atm at constant temperature.
➡️ Answer: What is 2.00 L?
A sample has a mass of 25.0 g and a volume of 20.0 mL.
➡️ Answer: What is 1.25 g/mL?
One mole of any substance contains this number of particles.
➡️ Answer: What is 6.022 × 10²³?
An electron transition from n = 5 to n = 2.
➡️ Answer: What is emission of energy?
The formula for sulfurous acid.
➡️ Answer: What is H₂SO₃?
The number of σ and π bonds in a triple bond.
➡️ Answer: What is 1 sigma and 2 pi bonds?
A 2.00 M solution diluted to twice the volume.
➡️ Answer: What is 1.00 M?
Fe(s) + Cu²⁺ → Fe²⁺ + Cu(s) is this type of reaction.
➡️ Answer: What is oxidation-reduction?
If volume doubles at constant temperature, pressure does this.
➡️ Answer: What is halves?
A compound contains 40.0% C, 6.7% H, and 53.3% O.
➡️ Answer: What is CH₂O?
A volume of 3.50 × 10² mL is expressed in liters.
➡️ Answer: What is 0.350 L?
A neutral atom gains two electrons.
➡️ Answer: What is a 2− ion?
An element with higher ionization energy between Na and Mg.
➡️ Answer: What is Mg?
The name of SnCl₄.
➡️ Answer: What is tin(IV) chloride?
The molecular geometry of a molecule with 3 bonds and 1 lone pair.
➡️ Answer: What is trigonal pyramidal?
The equation used for dilution problems.
➡️ Answer: What is M₁V₁ = M₂V₂?
Balancing: C₂H₆ + O₂ → CO₂ + H₂O.
➡️ Answer: What is 2, 7, 4, 6? (coefficients)
Pressure is constant
What is Charles' Law
An electron transitions from n = 2 to n = 5.
➡️ Answer: What is absorption of energy?
A value recorded as 0.00450 L is converted to mL with proper significant figures.
➡️ Answer: What is 4.50 mL?
An ion with the same number of electrons as argon.
➡️ Answer: What is Cl⁻ (or K⁺ or Ca²⁺)?
A photon with shorter wavelength compared to another.
➡️ Answer: What is higher energy?
The compound Fe₂O₃ requires this naming feature.
➡️ Answer: What is Roman numerals?
The hybridization of a central atom with 5 electron domains.
➡️ Answer: What is sp³d?
5.00 g solute in 0.500 L solution (molar mass = 50.0 g/mol).
Find molarity
➡️ Answer: What is 0.200 M?
A reaction that forms a solid from aqueous solutions.
➡️ Answer: What is a precipitation reaction?
A gas at 2.00 atm, 10.0 L, 300 K — solving for moles.
➡️ Answer: What is about 0.81 mol? (slightly modified from your exam style)
0.500 mol of Al₂(SO₄)₃ contains this many moles of oxygen atoms.
➡️ Answer: What is 6.00 mol of oxygen atoms?
A substance has density 0.850 g/mL and volume 0.0200 L.
➡️ Answer: What is 17.0 g?
The isotope with the greatest number of neutrons among: ¹²C, ¹³C, ¹⁴C, ¹3O.
➡️ Answer: What is ¹⁴C?
The trend that explains increasing ionization energy across a period.
➡️ Answer: What is increasing effective nuclear charge?
The correct formula for iron(III) phosphate.
➡️ Answer: What is FePO₄?
Why CO₂ has no dipole moment.
➡️ Answer: What is dipoles cancel due to symmetry?
A solution prepared by diluting 100.0 mL of 5.00 M solution to 1.00 L.
➡️ Answer: What is 0.500 M?
The oxidation state change in Fe → Fe²⁺.
➡️ Answer: What is oxidation?
A gas initially at 1 atm, 300 K, 2 L changes to 0.5 atm and 600 K.
➡️ Answer: What is 8.00 L?
This principle states that electrons fill the lowest energy orbitals first before occupying higher energy orbitals as electron configurations are built.
What is the Aufbau Principle?