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Water Properties & pH Practice 24-25

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Last updated over 1 year ago
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Question 1
1.

If a water molecule has an oxygen atom (8 P+, 8N, 8 e-) and 2 hydrogen atoms (1 P+, 1 e-). add the correct labels to water molecule in the diagram

Question 2
2.

Label the polar covalent bonds in this diagram

Question 3
3.

Label the 2 water molecules with their partial + and - charges and then add a hydrogen bond between the 2 water molecules

Question 4
4.

Question 5
5.

Question 6
6.

Question 7
7.

Question 8
8.

Question 9
9.
The 4 properties of water

1. _______________________ - creates surface tension and capillary action
2. Water is able to _______________________ A LOT of stuff
3. Ice _______________________ water
4. Water _______________________ temperature
Question 10
10.

Question 11
11.

Question 12
12.

Question 13
13.

Question 14
14.

Question 15
15.

Question 16
16.
Which substance will heat and cool down more quickly, the iron or the water?_______
What bonds exist in the water the must be broken or remade BEFORE the water can heat up or cool down (change its temperature)_______? Water is able to _______ the temperature of its environment (slow down the heating and cooling) because the _______ must first be made or broken BEFORE there is any change in temperature. Environments (like the coastline or an island) NEAR water or organisms made mostly of water (like all living things) will therefore (choose one; allow or resist) _______ rapid changes in temperature.
Question 17
17.

Question 18
18.

Question 19
19.

Question 20
20.

Question 21
21.

Identify and explain one dramatic example of how different the earth would be if water was not a polar molecule

Question 22
22.

Question 23
23.

Question 24
24.

Question 25
25.

Label the pH Scale with the following. Acid/Base/Neutral/More OH-/More H+/H+ = OH-

Question 26
26.

Question 27
27.

Question 28
28.

Question 29
29.

Question 30
30.

Question 31
31.

Question 32
32.

A water molecule is polar because ..........
the oxygen side is negative and the hydrogens side is positively charged
the oxygen side is positive and the hydrogens side is negatively charged
the hydrogen atoms pull on the electrons more than the oxygen atom does
the oxygen and the hydrogen atoms pull on the electrons equally
The weak and temporary bond between the positive hydrogen side of a water molecule and the negative side of another molecule (maybe water) is called ...
oxygen bond
covalent bond
hydrogen bond
ionic bond
What is the bond type shown by the blue arrow in the picture?


hydrogen bond
ionic bond
covalent bond
What is the bond type shown by the blue arrow in the picture?


hydrogen bond
ionic bond
covalent bond
What is the charge on the hydrogen end of the molecule shown in the picture?


slightly positive (+)
slightly negative (-)
neutral
The hydrogen bond between the 2 water molecules is an example of _________________, while the hydrogen bond between a water and another molecules (like the sides of the tube shown in the diagram) is an example of _____________
adhesion/cohesion
cohesion/adhesion
surface tension/capillary action
cohesion/cohesion
adhesion/adhesion
Insects can "stand" on water because water __.



is a good evaporative coolant
has high cohesive properties which causes high surface tension
is a universal solvent
When water moves up trees, it is ____?




surface tension
capillary action
cohesion

Mix oil and water together. What happens after time?


They stay mixed together because they are both polar.
Water is polar and oil is nonpolar so they separate.
water is non-polar and oil is polar so they separate
Match the image with the description of water properties
capillary action
surface tension
water is a good solvent
water moderate temperatures (slows down changes in temperature)
Match the substance with its correct label
salt
sugar
protein
oil
any substance that can dissolve in water
any substance that cannot dissolve in water
any substance that has charges that will be surrounded by water molecules when water is the solvent
any substance that repels water
hydrophilic
hydrophobic
Match the picture with the correct label - which shows ice and which shows liquid water?
Item 1

Item 2

ice
liquid water
From our water inquiry, what property/ies of water is/are shown by this picture where the closer drops are water and the drops further away are rubbing (isopropyl) alcohol)?
cohesion & surface tension
ice floats on water
water heats up and cools down slowly
water is a good solvent
What is happening in this video when the toothpick dipped in detergent touches the water drops (which are the drops in the front row)?
Water does not have any hydrogen bonds so the water comes apart when it disrupted by the toothpick
The detergent on the tootpick breaks the hydrogen bonds holding the water molecules in the drop together
The detergent causes polar bonds to be made in the water molecules which pushes them away from each other
Look at the data table above, what would be an explanation for the difference in the 2 data sets - width of water droplets - for water and rubbing alcohol?
more drops of alcohol were added than water droplets which makes the alcohol width larger
alcohol has hydrogen bonds which holds the alcohol molecules closer together and causes the alcohol droplets to have a larger width
water has hydrogen bonds which holds the water molecules closer together and causes the water droplets to have a more narrow width
Which of the following is true about the pH levels of acids and bases?
Acids have pH greater than 7, bases have pH less than 7
Acids have pH less than 7, bases have pH greater than 7
Both acids and bases have pH greater than 7
Both acids and bases have pH less than 7
How do acids and bases differ in terms of H+ and OH- ion concentration?
Acids and bases contain no hydrogen ions
Acids have less hydrogen ions, bases have more
Acids and bases have the same amount of hydrogen ions
Acids have more hydrogen ions, bases have more OH-
Which is the strongest base from the list below?





Pure Water
Ammonium chloride
Sodium hydroxide
Before the industrial revolution, what is the LOWEST pH the ocean has reached in the last 25 million years?
about 8.05
about 7.7
2100
1800
What happens when excess atmospheric CO2 dissolves (diffuses) into ocean water? Choose all that are correct.
It makes the ocean water more basic
It makes the ocean water more acidic
It makes it harder for shellfish to grow their shells
It damages coral reefs
Based on the current rate of change, what will the pH of the ocean be in the year 2100?
about 8.05
about 7.7
2100
1800
Using the chart above ...Starting with the pre-Industrial Revolution ocean pH of 8.2, what is be the predicted percent increase change in acidity by 2100?
+26%
+100%
+216%
What equation shows how shellfish, sea urchins and corals build their hard, external shells or bodies
CO2 + H20 --> H2CO3 (carbonic acid)
Ca+2 + CO3-2 --> CaCO3 (calcium carbonate)
The red arrows above show the direction of the chemical reactions when the ocean has a low pH (too acidic). What is causing the reactions to go in the WRONG direction?
Too little CO2 dissolving in the ocean water
Too much CO2 dissolving in the ocean water
  • The red arrows above show the direction of the chemical reactions when the ocean has a low pH (too acidic). What substance that shellfish, sea urchins and coral need is MUCH harder for them to make when the pH is lower (more acidic)?
CO2 (carbon dioxide)
H2CO3 (carbonic acid)
HCO3- (bicarbonate ion)
CaCO3 (calcium carbonate)