Intro to Solutions

Which formula represents a mixture?

• C₆H₁₂O₆(l)

• C₆H₁₂O₆(s)

• LiCl(aq)

• LiCl(s)

Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This solution is classified as

• element

• compound

• heterogeneous mixture

• homogeneous mixture

The solubility of a solid substance in water depends on the

• Pressure on the solution

• Rate of stirring

• Size of the solid sample

• Temperature of the water

The solubility of a GAS in solution is dependent upon

• Temperature

• Pressure

• Both temperature and pressure

• Neither temperature nor pressure

A gas will behave most IDEALLY at

• High temperature and low pressure

• Low temperature and high pressure

• High temperature and high pressure

• Low temperature and low pressure

A gas is most SOLUBLE at

• High temperature and low pressure

• Low temperature and high pressure

• High temperature and high pressure

• Low temperature and low pressure

Pressure will affect the solubility of

• Solids, only

• Liquids, only

• Gases, only

• All of the above

A solution is formed by dissolving 45 grams of NH₄Cl in 100 grams of H₂O at 70ºC. Which statement correctly describes this solution?

• The solute is NH₄Cl and the solvent is H₂O; the mixture is homogeneous

• The solute is NH₄Cl and the solvent is H₂O; the mixture is heterogeneous

• The solute is H₂O and the solvent is NH₄Cl; the mixture is homogeneous

• The solute is H₂O and the solvent is NH₄Cl; the mixture is heterogeneous

At STP, two 5.0-gram solid samples of different ionic compounds have the same density. These solid samples could be differentiated by their

• Mass

• Volume

• Temperature

• Solubility in water

When KF is dissolved in water, K⁺ and F^- ions are created. Which statement is true?

• The K⁺ ions are more attracted to the more electronegative hydrogen atoms in water

• The K⁺ ions are more attracted to the more electronegative oxygen atoms in water

• The F^- ions are more attracted to the more electronegative hydrogen atoms in water

• Both ions are attracted to the more electronegative oxygen atoms in water