Connect unequal electron sharing in water to partial charges and draw hydrogen bonds between molecules.
Tę umiejętność sprawdza 14 zadań wzorowanych na arkuszach IB z lat 2022–2025.
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…
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.…
Draw the molecular structure of water.
Water properties affect both individual cells and whole plants. (a) Draw and label two interacting water molecules. (b) Outline what happens when animal and plant cells are immersed in pure water. (c) Explain transpiration and the adaptations of xylem vessels…
(i) State the number of water molecules shown. (ii) Identify the dotted intermolecular interactions.
(i) With reference to the model, explain evaporation of water from sweat. (ii) Outline why humans secrete sweat when body temperature rises.
Explain how the difference in molecular polarity contributes to the thermal-property differences.
Using the data, explain why ethane would be less suitable than water for evaporative cooling at the skin.
(a) Outline how plants use atmospheric carbon to make triglyceride oils. (b) Explain why glucose dissolves readily in water whereas triglyceride oils do not. (c) Explain how a fat-rich diet could contribute to poor health.
(a) Outline how plants use atmospheric carbon to make triglyceride oils. (b) Explain why glucose dissolves readily in water whereas triglyceride oils do not. (c) Explain how glucose availability in human tissues is regulated.
At standard pressure, water is liquid from about0°C to100°C, whereas methane is liquid only from about−182°C to−161°C. Which feature helps explain the greater temperature interval for liquid water? A. Fewer atoms automatically making any liquid more stable B.…
Which interaction is a hydrogen bond between two water molecules? A. The covalent O–H link within a single molecule B. An attraction from a partially positive hydrogen to an oxygen on a neighbouring molecule C. A covalent bond directly linking their two oxygen…
The model contains only water molecules. Solid lines are covalent bonds; dashed lines represent attractions between molecules. Which property is not demonstrated? A. Hydrogen bonding between molecules B. Unequal distribution of charge within a molecule C.…
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