Properties of Water. Practice Quiz. Hydrogen (H) & Oxygen (O). 1. What two elements make up water?. 2. Write the chemical formula for water. H 2 O. 3. Is water an element, compound, or mixture?. Compound.
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Properties of Water
Hydrogen (H) & Oxygen (O)
1. What two elements make up water?
2. Write the chemical formula for water.
3. Is water an element, compound,
A substance with two or more elements chemically combined in definite proportions.
4. Define the term compound.
5. What kind of chemical bond exists
between a hydrogen and oxygen
atom in a water molecule?
A covalent bond
6. Draw a model of a water molecule.
The parentheses mean ‘partial.’
7. Draw partial (+) and partial (-) charges on
the water molecule you drew above.
This symbol also means partial →
8. Which of the following molecules are polar?
The use of dashed lines show that hydrogen bonds are relatively weak.
9. Draw two water molecules and a hydrogen bond.
10. How many hydrogen bonds can a water
molecule form with other water molecules?
11. What term describes the attraction between molecules of the same substance?
12. Without a hydrogen bond, when molecule A
moves to the right, will it be able to drag
molecule B along with it?
13. With a hydrogen bond between them, will
molecule A be able to drag molecule B along
14. What are some examples of water cohesion?
Drops on a penny
A proboscis keeps this bee at a safe distance
Insect trapped in water
15. What are some examples where
surface tension breaks down?
Bread clip motor boat
16. What term describes the attraction between molecules of different substances?
Water drop on glass slide
The water will be attracted toward the rod
17. What will happen when a charged rod or balloon is brought up close to a stream of water?
18. What are some examples of water adhesion?
A meniscus that water forms in a glass tube.
19. What are some examples of anti-adhesion?
Scotchgard ® carpet
Wax-layer on leaves
Water on wax paper
Duck feathers repel water
New: Researchers have made an omniphobic material that repels both water and oil.
Nature has never made this type of material.
20. What is the term which describes the amount of heat
energy needed to increase a substance’s temperature?
21. Which substance in the chart is able to absorb the
most heat for a given change in temperature?
22. Which substance in the chart is able to absorb the
least amount of heat for a given change in temperature?
23. What example in the Properties of Water lab
demonstrated a low heat capacity for air and a
high heat capacity for water?
24. What is a mixture?
A substance made up of elements or compounds that are combined but not chemically bonded together.
25. What are some examples of mixtures?
26. What are two kinds of mixtures made with water?
Solutions and suspensions
27. Compare solvent, solute, and solution.
what does the dissolving
what is being dissolved
28. Define a solution?
A mixture in which the molecules of the mixed substances are evenly spread out.
29. Which substance(s) below dissolve in water?
30. What is a suspension?
A mixture from which some of the nondissolved particles settle out slowly upon standing.
31. What some examples of suspensions?
When water breaks apart, what kind of ions
Hydrogen (H+) ions and hydroxide (OH-) ions
33. What does the pH scale indicate?
It indicates the concentration of hydrogen ions (H+) in a solution.
34. What is the range of the pH scale?
0 to 14
What is the pH of a substance that has an
equal number of H+ and OH- ions?
Substances with a pH below 7 are ________
while those above 7 are _________?
37. Acids have more ____ions than _____ ions?
38. The _______the pH, the greater the acidity.
39. _______ have more OH- ions than H+ions?
Place the 5 substances
listed below on the
scale to the right.
Click for answer
The pH in most cells in the human body must
stay between _______ and______ ?
__________ are weak acids or bases that can
react with strong acids or bases to stop sharp,
sudden changes in pH.
43. Buffers play an important role in the process of
______________, where living things are able
to maintain a stable, internal environment.