A1.1 Water Flashcards
What causes cohesion between water molecules?
A. Hydrogen ions attract oxygen ions.
B. Water molecules form covalent bonds between each other.
C. Covalent bonds between hydrogen and oxygen in a water molecule.
D. Hydrogen bonds between adjacent water molecules.
D
Which of the following factors caused water to be retained on the surface of the earth?
Select the 2 correct answers
A. Gravity
B. Goldilocks zone
C. Viscosity
D. Temperature
A & D
Water is an evaporative coolant that allows organisms to lose heat by evaporating. Which of the following organs does not lose heat in this manner?
A. Dog’s tongue
B. Human brain
C. Horse’s lung
D. Plant leaf
B
Which kind of bonds can form between water molecules?
A. Covalent
B. Hydrogen
C. Peptide
D. Ionic
B
In a water molecule, what is meant by the ‘positive pole’?
A. The area containing more electrons near its hydrogen atom nuclei
B. The area containing fewer electrons near its hydrogen atom nuclei
C. The area containing fewer electrons near its oxygen atom nuclei
D. The area containing no electrons near its oxygen atom nuclei
B
In a water molecule, what the area containing more electrons around the oxygen atom known as?
A. Positive nucleus
B. Negative pole
C. Ionic territory
D. Synaptic cleft
B
Describe hydrogen bonds by filling the gaps with two of the following words:
strong
weak
covalent
atoms
poles
A hydrogen bond is a __________ bond formed between the positive and negative _________ of adjacent water molecules.
weak, poles
Explain why water is a good substance for transport of molecules by filling in the gaps by dragging and dropping three of the following words:
diffuse
clean
react with
dissolve
hydrophilic
viscosity
Water is a good substance for the transport of molecules in living things as it can easily _________ a wide range of ___________molecules. It also has low__________ which allows aqueous solutions to travel through vessels.
dissolve, hydrophillic, viscosity
Which of the following statements relates to the cohesive property of water molecules that has importance to animals living in ponds and in transport of water in the xylem of plants?
A. Hydrogen atoms allow ionic bonds to form.
B. H-bonds make water molecules stick to each other.
C. Ions within water molecules attract each other, creating a strong bond.
D. Covalent bonds allow water molecules to stick to each other.
B
Which of the following molecules are readily soluble in water?
A. Glucose, some amino acids and ionic salts.
B. Ionic salts and polysaccharides
C. Lipids and carbohydrates.
D. Steroids, Fatty acids and glycerol.
A
Which property of water helps to keep lakes at relatively stable temperatures?
A. It it adhesive and cohesive.
B. It is transparent.
C. It has a high melting point.
D. It has a high specific heat capacity.
D
Some medicines are designed to dissolve in a glass of water.
What is the term used to describe polar molecules which are easily soluble in water?
A. Hydrophobic
B. Osmotic
C. Hydrostatic
D. Hydrophilic
D
Why, in the search for extaterrestrial life on distant planets, why is the Goldilocks zone an important consideration?
A. Planets in this zone provide a suitable environment for growth of Arena sativa.
B. Planets in this zone have the correct temperature for water to be liquid.
C. Planets in this zone provide a suitable environment for Ursus arctus.
D. Planets in this zone have oxygen in the atmosphere.
