Question

which of the following mixtures are solutions? (pick all that apply) oil and water sand and water nitrogen gas and oxygen gas sugar and water sodium chloride and water oxygen gas and water stainless steel (a mixture of iron and chromium) question 2 1 pts the primary interaction between water molecules and the ions formed from sodium chloride are london dispersion forces covalent bonding hydrogen bonding ion dipole forces

Explanation:

Step1: Define a solution

A solution is a homogeneous mixture at the molecular or ionic level.

Step2: Analyze each mixture for Question 1

• Oil and water: Immiscible, not a solution.
• Sand and water: Sand settles, heterogeneous, not a solution.
• Nitrogen gas and oxygen gas: Homogeneous mixture of gases, a solution.
• Sugar and water: Sugar dissolves molecular - ly in water, a solution.
• Sodium chloride and water: NaCl dissociates into ions in water, a solution.
• Oxygen gas and water: Oxygen dissolves in water, a solution.
• Stainless steel: Homogeneous solid - solution of iron and chromium, a solution.

Step3: Analyze forces for Question 2

Sodium chloride dissociates into $Na^+$ and $Cl^-$ ions in water. Water is a polar molecule. The positive end of the water dipole is attracted to $Cl^-$ and the negative end to $Na^+$. So the primary interaction is ion - dipole forces.

Answer:

Question 1:

• Nitrogen gas and oxygen gas
• Sugar and water
• Sodium chloride and water
• Oxygen gas and water
• Stainless steel (a mixture of iron and chromium)

Question 2: Ion - dipole forces