CHEM110 Week 4: Exam 2 (sept 2026)

CHEM110 Week 4: Exam 2 [Sept 2026]

What is true about the compound Na₂O? Select all that apply.

Answers: A – D

1. It contains 2 sodium (Na) atoms ✅
2. Sodium and oxygen have equal mass
3. It has 3 oxygen atoms
4. It contains 1 oxygen (O) atom ✅

Use the balanced equation: N₂ + 3 H₂ → 2 NH₃

If you start with 9 mol of H₂, how many moles of NH₃ are produced?

9 mol H₂ × ① / ② = ③

Answers 1 – 3

1. 2 mol NH₃ ✅
2. 3 mol H₂ ✅ 

3. 6 mol NH₃ ✅

What is the molarity of a solution made by dissolving 10 g of NaOH in 0.5 L of water?

1. 10 g
2. 40.00 g
3. 0.5 L
4. 0.50 M ✅

What is the conjugate base of H₂S?

A. S²⁻
B. H₂O
C. OH⁻
D. HS⁻ ✅

You add a small amount of NaOH to a buffer containing H₂S and HS⁻. What will most likely happen?

Answers: A – D

1. The pH drops sharply.
2. The buffer is destroyed.
3. The solution becomes strongly basic.
4. The H₂S donates H⁺ to neutralize OH⁻, minimizing pH change. ✅

What part of a chemical formula tells you the number of each type of atom in one molecule?

Answers: A – D

1. Coefficient
2. Symbol
3. Subscript ✅
4. Superscript……………………………………………….purchase this entire quiz at $40 only