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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

Properties of Water

Practice Quiz


1 what two elements make up water

Hydrogen (H) & Oxygen (O)

1. What two elements make up water?

2. Write the chemical formula for water.

H2O

3. Is water an element, compound,

or mixture?

Compound


4 define the term 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. definite proportions.

(+)

(+)

The parentheses mean ‘partial.’

(-)

7. Draw partial (+) and partial (-) charges on

the water molecule you drew above.

(-)

δ +

This symbol also means partial →


8. Which of the following molecules are polar? definite proportions.

(-)

(-)

(-)

(+)

(+)

(+)

(-)

(-)

(+)

carbon dioxide

water

ammonia

(+)

(+)

(+)

(+)

(-)

(-)

(-)

(+)

(-)

(-)

(-)

(+)

(+)

(+)

(+)

Hydrogen chloride

formaldehyde

methane


9 draw two water molecules and a hydrogen bond

1 definite proportions.

(-)

The use of dashed lines show that hydrogen bonds are relatively weak.

Hydrogen bond

9. Draw two water molecules and a hydrogen bond.

2

(+)

3

4

10. How many hydrogen bonds can a water

molecule form with other water molecules?

Four


11 what term describes the attraction between molecules of the same substance

Cohesion definite proportions.

B

A

11. What term describes the attraction between molecules of the same substance?

No

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

with it?

A

B

Yes


14. What are some examples of water cohesion? definite proportions.

Surface tension

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?

“Scaring” pepper

Bread clip motor boat


16 what term describes the attraction between molecules of different substances

Adhesion definite proportions.

(+)

16. What term describes the attraction between molecules of different substances?

(+)

(+)

(-)

(+)

(+)

glass

Water drop on glass slide


17 what will happen when a charged rod or balloon is brought up close to a stream of water

The water will be attracted toward the rod definite proportions.

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? definite proportions.

A meniscus that water forms in a glass tube.

Capillary action


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?

Heat Capacity


21. Which substance in the chart is able to absorb the definite proportions.

most heat for a given change in temperature?

Water


22. Which substance in the chart is able to absorb the definite proportions.

least amount of heat for a given change in temperature?

Air


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?

Air-filled balloon

Water-filled balloon


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?

Beef

Onion

Tomato

Lettuce

Cheese

Ketchup

Mustard

bread

copper

zinc

water

sugar

corn syrup

CO2

caramel

caffeine

citric acid


26. What are two kinds of mixtures made with water? definite proportions.

Solutions and suspensions

27. Compare solvent, solute, and solution.

water

Sugar cubes

Sugar water

solvent

solution

solute

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?

Magnesium sulfate

oil

iodine

paraffin wax

salt

Non polar

polar

Non polar

Non polar

polar


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?

Paint

Blood

Chocolate milk


When water breaks apart, what kind of ions definite proportions.

are formed?

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?

7

Substances with a pH below 7 are ________

while those above 7 are _________?

Acids

Bases


37. Acids have more ____ions than _____ ions? definite proportions.

H+

OH-

38. The _______the pH, the greater the acidity.

lower

39. _______ have more OH- ions than H+ions?

Bases


Place the 5 substances definite proportions.

listed below on the

scale to the right.

Oven cleaner

Soap

Lemon juice

Oven cleaner

Human blood

Pure water

Human blood

Soap

Pure water

Click for answer

Lemon juice


The pH in most cells in the human body must definite proportions.

stay between _______ and______ ?

6.5

7.5

__________ are weak acids or bases that can

react with strong acids or bases to stop sharp,

sudden changes in pH.

Buffers

43. Buffers play an important role in the process of

______________, where living things are able

to maintain a stable, internal environment.

homeostasis


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