Umiejętności z tego działu sprawdza 25 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 23 z 57 arkuszy w bazie.
A small insect rests on a pond with its feet making slight depressions in the surface. Which molecular interaction primarily supports the surface film? A. Covalent bonds form between the water and the insect cuticle B. Hydrogen bonds attract neighbouring water…
Outline one biological importance of water’s high specific heat capacity.
A jellyfish is supported within seawater rather than standing on a solid surface. State the physical property of water responsible for this support.
A model of liquid water uses a label on each oxygen atom to show the charge caused by unequal sharing of bonding electrons. Which label is appropriate? A. A full positive charge, + B. A partial negative charge, δ− C. A full negative charge, − D. No…
How are the oxygen and hydrogen atoms bonded within an individual water molecule? A. By ionic bonds after complete electron transfer B. By polar covalent bonds with unequal electron sharing C. By hydrogen bonds joining nuclei directly D. By non-polar covalent…
A small water-strider rests on the surface of a still freshwater pool without breaking through it. Which property directly supports its weight? A. Surface tension B. Transparency C. High specific heat capacity D. Adhesion to mineral surfaces
Water affects both plant physiology and the habitats of organisms. (a) Outline benefits to organisms arising from cohesion of water molecules. (b) Outline how environmental conditions influence transpiration. (c) Explain osmosis and its effects on plant cells.…
Which feature of a cold-water seal most directly reduces heat loss to highly thermally conductive water? A. A streamlined outline B. A thick insulating blubber layer C. Large canine teeth D. A sensitive whisker
Which phenomenon depends most directly on water adhering to a solid surface? A. A lake resisting rapid temperature changes B. Water rising through narrow pores between soil particles C. Sweat absorbing heat as it evaporates D. Ions becoming surrounded by…
Draw the molecular structure of water.
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