IPC Fall Semester Exam 2024

Why is water considered a polar molecule?

• it has a strong positive end

• it has a strong negative end

• it has a positive and negative end

• water is nonpolar

What happens when the ionic solute, sodium chloride, is placed in a polar solvent, water? Select TWO correct answers.

• It does not dissolve.

• The solvent breaks apart into oxygen and hydrogen gas.

• The solute breaks apart into sodium and chloride ions.

• The solution separates into nonpolar molecules of sodium chloride.

• It dissolves up to the saturation point.

Tags

NGSS.HS-PS1-3

Gasoline is composed of long-chain carbon and hydrogen compounds held together by non-polar covalent bonds. Which of the following explains why gasoline is not soluble in water?

• Gasoline is less dense than water.

• Gasoline is flammable and water is not flammable.

• Water molecules are held together by polar covalent bonds.

• Water molecules are much smaller than the molecules in gasoline.

Which characteristic of a molecule most impacts whether it will dissolve in water?

• size

• polarity

• ionization energy

• atomic radius

Tags

NGSS.HS-PS1-1

Water is often called the universal solvent because many common substances dissolve in water. Why do so many substances dissolve in water?

• There is an abundance of water on Earth.

• Water molecules only contains two elements.

• Water molecules have a polar structure.

• Hydrogen and oxygen are very reactive when combined.

Tags

NGSS.HS-ESS2-5

Five grams of sugar is mixed with 300 mL of water. In this solution, water would be classified as the —

• A solute

• B solvent

• C saline

• D base

An unknown substance is added to water. As it dissolves, it breaks apart into individual molecules. The substance is —

• A. an ionic compound

• B. a polar covalent compound

• C. a metallic compond

• D. a non-polar covalent compound

Which of the following is the attraction of molecules to the same substance?

• cohesion

• adhesion

• capillary action

• surface tension

What is the property of water that allows light objects such as water gliders to rest on top of water?

• cohesion

• adhesion

• capillary action

• surface tension

What is the pH of water on the pH scale?

• A 1

• B 4

• C 7

• D 14

Tags

NGSS.HS-ESS2-5