Understanding Concentration Feedback Loops and pH

What is the definition of concentration in a chemical solution?

• The amount of solute dissolved in a given volume of solvent

• The temperature at which a solution boils

• The pressure exerted by a gas in a closed container

• The rate at which a solute dissolves in a solvent

Tags

NGSS.HS-PS1-5

Which of the following best describes a positive feedback loop?

• A process that decreases the output of a system

• A process that amplifies changes and moves a system away from its balance

• A process that maintains stability in a system

• A process that reverses the direction of change in a system

Explain negative feedback loops

• By amplifying changes and moving the system away from balance

• By reducing changes and bringing the system back to its set point or bring back to balance

• By increasing the rate of chemical reactions

• By maintaining a constant temperature

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NGSS.HS-LS1-3

What is the pH scale used for?

• Measuring the temperature of a solution

• Determining the concentration of solutes in a solution

• Measuring the acidity or basicity of a solution

• Calculating the density of a solution

Compare acids and bases in terms of their pH values.

• Acids have a pH greater than 7, while bases have a pH less than 7

• Acids have a pH less than 7, while bases have a pH greater than 7

• Both acids and bases have a pH of 7

• Acids and bases have the same pH range

• A higher concentration of hydronium ions results in a higher pH

• A higher concentration of hydroxide ions results in a lower pH

• A higher concentration of hydronium ions results in a lower pH

• Hydronium and hydroxide ions do not affect pH

Which sweet tea would you expect to taste the sweetest? M=mols/L

• 1M

• 3M

• 5 M

• 2.5M

Tags

NGSS.HS-PS1-5

Analyze the impact of adding a strong acid to a neutral solution in terms of hydronium H30+ and hydroxide ion OH- concentrations.

• The concentration of hydronium ions decreases, and the concentration of hydroxide ions increases

• The concentration of hydronium ions increases, and the concentration of hydroxide ions decreases

• Both hydronium and hydroxide ion concentrations remain unchanged

• Both hydronium and hydroxide ion concentrations increase

Last time in class we watched a video on Ocean Acidification. We watched and discussed how our shellfish shells are breaking down. What is the reason.

• The hydrogen ions being created from CO2 being added to the ocean is consuming the carbonate ion which the shellfish need to make CaCO3

• The acidity of the water is eating away at the shells

• The CO2 is being absorbed by the shells

Tags

NGSS.HS-ESS2-6

NGSS.HS-ESS3-5

NGSS.HS-LS2-6