Atomic Structure
Which particle determines an element’s identity?
A) Proton B) Neutron C) Electron D) Nucleus
A) Proton
What happens to atomic radius across a period?
A) Increases B) Decreases C) Stays the same D) Doubles
B) Decreases
State Boyle's Law.
P1V1=P2V2
Is it endothermic or exothermic when the surroundings' temperature increases?
Exothermic
What is the molar ratio of H₂ to O₂ in 2H₂ + O₂ → 2H₂O?
A) 1:1 B) 2:1 C) 1:2 D) 2:2
B) 2:1
How many electrons are in a 3p subshell?
6
Which element has the highest electronegativity?
Fluorine(F)
What happens to volume in Charles’s Law when T(temperature) increases?
A) Decreases B) Increases C) Stays the same D) Depends on pressure
B) Increases
What is specific heat?
Energy needed to raise 1g of substance by 1℃
Balance: __C₃H₈ + __O₂ → __CO₂ + __H₂O
1 C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
What are isotopes?
Same protons, different neutrons
Which element has the highest metallic character?
A) Al B) Na C) K D) Mg
C) K(Potassium)
A reaction is at equilibrium. More product is added. Is the shift left or right?
Left
Calculate q in J: m = 100 g H2O, ΔT = 20°C, c = 4.18 J/g°C
8360 J
How many moles of H₂O are produced from 2 mol H₂ and 1 mol O₂?
2 mol H₂O
What is the element with a electron configuration ending in 3d⁶ 4s²?
Iron(Fe)
Why does ionization energy increase across a period?
A) Decrease in nuclear charge
B) More electron shielding
C) Electrons are closer to nucleus
D) Larger atomic radius
C) Electrons are closer to nucleus
Which of the following will increase the rate of the reaction? (Choose all that apply)
A) Increase pressure B) Add a catalyst C) Decrease temperature D) Increase concentration
ABD
How to calculate energy for a phase change?
q = m × ΔH
What is the limiting reactant? 3 mol N₂ + 6 mol H₂ → ?
A) N₂ B) H₂ C) Both D) Neither
B) H₂
What happens when the electron jumps from ground state to excited state?
A) No change in energy B) Energy is emitted C) Energy is absorbed D) Depends on atom
C) Energy is absorbed
Which has a smaller atomic radius, Mg²⁺ or Mg?
Mg²⁺
2 mol gas, 5000 mL, 26.85℃, P = ?
9.852 atm
A 25.0 g piece of an unknown metal is heated to 200.0°C and then placed into 100.0 g of water at 20.0°C. The final temperature is 22.0°C. What is the specific heat capacity of the metal?
0.188 J/g°C
React 10 g CaCl₂ with 10 g AgNO₃. What mass of AgCl forms?
8.437 g AgCl