Understanding Water and Solutions

What percentage of the human body is made up of water?

• 50%

• 70%

• 60%

• 80%

Why is water considered an excellent solvent?

• Because it is abundant

• Because it is polar

• All of the above

• Because it is liquid at room temperature

Tags

NGSS.HS-ESS2-5

What property of water decreases the attraction between ions of different charges?

• Hydrogen bonding

• Electronegativity

• Polarity

• Dielectric property

What is the role of electrolytes in the body?

• To increase water absorption

• To provide energy

• To break down food molecules

• To carry electrical signals

Who discovered that substances dissolved in water conduct electric currents?

• Svante Arrhenius

• Michael Faraday

• William Whewell

• Heiko Langner

How does hydrogen peroxide act as a bleach?

• By increasing the water content in the laundry

• By reducing the color molecules

• By adding oxygen to the stains

• By oxidizing the stain molecules

What is the molarity of a solution?

• The weight of solute per liter of solution

• The number of moles of solute per liter of solution

• The number of solute molecules per liter of solution

• The volume of solute per liter of solution

What is the difference between molarity and molality?

• There is no difference, they are interchangeable

• Molarity measures solute volume, molality measures solute mass

• Molarity is moles per kilogram, molality is moles per liter

• Molarity is moles per liter, molality is moles per kilogram

What does a 3% solution of hydrogen peroxide indicate?

• 3 milliliters of H2O2 per liter of water

• 30 grams of H2O2 per liter of water

• 3 moles of H2O2 per liter of water

• 3 grams of H2O2 per 100 grams of water

Tags

NGSS.HS-PS1-5

What is the molarity of the hydrogen peroxide solution used in the video?

• 1 M

• 3 M

• 0.88 M

• 0.1 M

Tags

NGSS.HS-PS1-5