Answer:
D. The higher energy chair conformation contains two axial methyl groups.
Explanation:
The diaxial trans-1,4-dimethylcyclohexane has the highest energy (the least stable) and the diequatorial chair conformation has the lowest energy (the most stable).
The diaxial conformation has a higher energy due to the interaction between the methyl groups.
Answer:
For example, 0.9% NaCl contains 0.9 g NaCl per 100 ml of solution or 9 g NaCl/l. This can be converted to molarity by dividing by molecular weight: 0.9% NaCl = (9g/l)/(58.5g/mole) = 0.15 M NaCl.
Answer is: sulfate anion.
Balanced chemical reaction: Ca²⁺(aq) + SO₄²⁻(aq) → CaSO₄(s) .
Calcium sulfate (CaSO₄) has very low solubility in water (Ksp for calcium sulfate is 2.36·10⁻⁴).
Calcium cation (Ca²⁺) will form a precipitate with other anions also:
1) with oxalate anion (C₂O₄²⁻) will form CaC₂O₄(s), calcium oxalate.
2) with phosphate anion (PO₄³⁻) will form Ca₃(PO₄)₂(s), calcium phosphate.
3) with hydroxide anion (OH⁻) will form Ca(OH)₂(s), calcium hydroxide.
4) with carbonate (CO₃²⁻) will form CaCO₃(s), calcium carbonate.
South pole is positive and North pole is negative.
