2.2 Water

Outline how the properties of water make it an ideal transport medium in plants.

Outline how the properties of water make it an ideal transport medium in plants.

Outline how the properties of water make it an ideal transport medium in plants.

The activity of amylase from two bacterial species and a fungus was measured at different pH levels and constant temperature. The results are shown in the graph.

[Source: Held, P., 2012. Enzymatic Digestion of Polysaccharides. Part II: Optimization of Polymer Digestion and Glucose Production in Microplates. Available at: https://www.agilent.com/cs/library/applications/enzymatic-digestion-of-polysaccharides-part-II-5994-3304EN-agilent.pdf.]

Which statement about the effect of pH on amylase can be concluded?

A.  A. oryzae amylase has the highest optimum pH.

B.  A change in pH affects amylase most in B. licheniformis.

C.  The optimum pH is 6 in B. subtilis.

D.  Amylase activity at pH 8 is the lowest in B. licheniformis.

The activity of amylase from two bacterial species and a fungus was measured at different pH levels and constant temperature. The results are shown in the graph.

[Source: Held, P., 2012. Enzymatic Digestion of Polysaccharides. Part II: Optimization of Polymer Digestion and Glucose Production in Microplates. Available at: https://www.agilent.com/cs/library/applications/enzymatic-digestion-of-polysaccharides-part-II-5994-3304EN-agilent.pdf.]

Which statement about the effect of pH on amylase can be concluded?

A.  A. oryzae amylase has the highest optimum pH.

B.  A change in pH affects amylase most in B. licheniformis.

C.  The optimum pH is 6 in B. subtilis.

D.  Amylase activity at pH 8 is the lowest in B. licheniformis.

Water has important solvent properties. Explain these properties using an example to illustrate your answer.

Calculate the change in temperature in each cup after 20 minutes.

Uncovered:

Covered with wet tissue paper:

Water has important solvent properties. Explain these properties using an example to illustrate your answer.

Calculate the change in temperature in each cup after 20 minutes.

Uncovered:

Covered with wet tissue paper:

Calculate the change in temperature in each cup after 20 minutes.

Uncovered:

Covered with wet tissue paper:

Water has important solvent properties. Explain these properties using an example to illustrate your answer.

Hydrogen bonds can exist both within and between molecules in living organisms and have an impact on their structure and function. Explain the importance of hydrogen bonding for living organisms.

State two conditions that must be the same for each cup at the start of the experiment.

State two conditions that must be the same for each cup at the start of the experiment.

State two conditions that must be the same for each cup at the start of the experiment.

Hydrogen bonds can exist both within and between molecules in living organisms and have an impact on their structure and function. Explain the importance of hydrogen bonding for living organisms.

Explain, with reference to the thermal properties of water, how this experiment helps demonstrate how humans respond to overheating.

Explain, with reference to the thermal properties of water, how this experiment helps demonstrate how humans respond to overheating.

Explain, with reference to the thermal properties of water, how this experiment helps demonstrate how humans respond to overheating.

Hydrogen bonds can exist both within and between molecules in living organisms and have an impact on their structure and function. Explain the importance of hydrogen bonding for living organisms.

Outline how the carbon dioxide could be removed from the water used to irrigate the plant.

Water has a specific heat capacity of 4.2 J g^–1 K^–1 at room temperature, a latent heat of vaporization equal to 2257 J g^–1, and a boiling point of 100 °C. What are the specific heat capacity, latent heat of vaporization and boiling point of methane?

[Source: © International Baccalaureate Organization 2019]

Outline how the carbon dioxide could be removed from the water used to irrigate the plant.

Water has a specific heat capacity of 4.2 J g^–1 K^–1 at room temperature, a latent heat of vaporization equal to 2257 J g^–1, and a boiling point of 100 °C. What are the specific heat capacity, latent heat of vaporization and boiling point of methane?

[Source: © International Baccalaureate Organization 2019]

Outline how the carbon dioxide could be removed from the water used to irrigate the plant.

Outline how hydrogen bonds form in water.

Outline how hydrogen bonds form in water.

Outline how hydrogen bonds form in water.

State how many water molecules are shown in the diagram. 

State how many water molecules are shown in the diagram. 

State how many water molecules are shown in the diagram. 

State how many water molecules are shown in the diagram. 

State how many water molecules are shown in the diagram. 

State how many water molecules are shown in the diagram.