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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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.
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. definite proportions.
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? definite proportions.
1 definite proportions.
The use of dashed lines show that hydrogen bonds are relatively weak.
10. How many hydrogen bonds can a water
molecule form with other water molecules?
Cohesion definite proportions.
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 definite proportions.
molecule A be able to drag molecule B along
14. What are some examples of water cohesion? definite proportions.
Drops on a penny
A proboscis keeps this bee at a safe distance
Insect trapped in water
15. What are some examples where definite proportions.
surface tension breaks down?
Bread clip motor boat
Adhesion definite proportions.
Water drop on glass slide
The water will be attracted toward the rod definite proportions.
18. What are some examples of water adhesion? definite proportions.
A meniscus that water forms in a glass tube.
19. What are some examples of anti-adhesion? definite proportions.
Scotchgard ® carpet
Wax-layer on leaves
Water on wax paper
Duck feathers repel water
New: Researchers have made an definite proportions.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 definite proportions.
energy needed to increase a substance’s temperature?
21. Which substance in the chart is able to absorb the definite proportions.
most heat for a given change in temperature?
22. Which substance in the chart is able to absorb the definite proportions.
least amount of heat for a given change in temperature?
23. What example in the Properties of Water lab definite proportions.
demonstrated a low heat capacity for air and a
high heat capacity for water?
24. What is a mixture? definite proportions.
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? definite proportions.
Solutions and suspensions
27. Compare solvent, solute, and solution.
what does the dissolving
what is being dissolved
28. Define a solution? definite proportions.
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? definite proportions.
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 definite proportions.
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? definite proportions.
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? definite proportions.
38. The _______the pH, the greater the acidity.
39. _______ have more OH- ions than H+ions?
Place the 5 substances definite proportions.
listed below on the
scale to the right.
Click for answer
The pH in most cells in the human body must definite proportions.
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.