Chapter 2
What is the most stable ion expected for oxygen?
O²-
How many atoms are in 5.00 mol of sodium?
3.01 × 10²⁴ atoms
What is decomposition?
This type of reaction has one compound breaking apart into two or more products
How many protons, neutrons, and electrons are in ⁷³₃₄Se²⁻?
34 protons, 39 neutrons, 36 electrons
What is the formula mass of H₂O?
18.015 amu
When AgNO₃(aq) is mixed with NaCl(aq), what precipitate forms?
AgCl(s)
What is the empirical formula of C₈H₁₆O₄?
C₂H₄O
What is the molarity of a solution made by dissolving 3.25 mol of LiCl in 2.78 L of solution?
1.17 M
What is the net ionic equation for the reaction between HCl(aq) and NaOH(aq)?
H⁺(aq) + OH⁻(aq) → H₂O(l)
What is the name of Fe₂S₃?
Iron(III) sulfide
A compound contains 40.00% C, 6.71% H, and 53.29% O. Its molar mass is 180.156 g/mol. What are its empirical and molecular formulas?
Empirical: CH₂O; Molecular: C₆H₁₂O₆
In the reaction
Mg(s) + Br₂(l) → MgBr₂(s)
which substance is oxidized, and which is reduced?
Mg is oxidized; Br₂ is reduced.
Bromine has an atomic mass of 79.904 amu. If Br-79 has a mass of 78.9183 amu and Br-81 has a mass of 80.9163 amu, what are their natural abundances?
Bromine has an atomic mass of 79.904 amu. If Br-79 has a mass of 78.9183 amu and Br-81 has a mass of 80.9163 amu, what are their natural abundances?
A water sample contains 5.32 μg of arsenic in 1.20 L of water. What is the concentration of arsenic in ppb?
4.43 ppb
For the reaction
2H₂ + O₂ → 2H₂O,
if you have 3.0 mol H₂ and 1.0 mol O₂, which reactant is limiting?
O2