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# Science 9: Water and Bonding (Part 2) - REVIEW ASSIGNMENT

AB
Acidic solutions have a pH that is ____ seven.below
Basic solutions have a pH that is ___ seven.above
Distilled water has a pH of ___.seven
A liquid with a pH of 1 would be described as being ________ ________.strongly acidic
A liquid with a pH of 6 would be described as being ________ _________.weakly acidic
A liquid with a pH of 8 would be described as being ________ _______.weakly basic
A liquid with a pH of 13 would be described as being _______ _________.strongly basic
A chemical reaction in which arrows are pointing both ways is said to be ____.reversible
Distilled water has a pH of ___.seven
Pure water freezes at ___ Celsius.0
The ____ of a substance is defined as the amount of heat (energy) that must be absorbed or lost by a substance to change its temperature by 1 degree Celsius.specific heat (In the graph below, it shows that the specific heat is 1cal/C for the liquid phase of water. This is represented by the gentle upwardly sloping part of the graph between 0 and 100C) p.48,
Compared with most other substances, water has an unusually high ____ which explains why it can store a lot of energy and it takes a lot of energy to change its temperature.specific heat
Why doesn't it get really cold or really hot when you are out at sea?The high specific heat of water allows it to act as a buffer (to temperature change) * The high specific heat of water allows it to absorb a lot of heat from the air without increasing its own temperature too much. When cold air blows over the ocean, the large amount of heat (not to be confused with temperature) can be transferred to the air. Since air has a much lower specific heat, it will warm up easily. In places like the Bering Sea of Alaska, the ocean water keeps the air from getting too much below 20 degrees Fahrenheit even in the middle of winter. In summer, it keeps the air from getting too much above 55 degrees F.,
The transformation from a liquid to a gas is called ____ or ____.evaporation (Or vaporization. Boiling is the temperature at which the average molecule has enough energy to overcome the attractions that hold molecules together as a liquid. Therefore, the molecules vaporize quite quickly once the boiling point has been reached)
Water helps moderate Earth's temperature by _____ a lot of heat to become water vapor at the equator and then the moist air moves toward the poles to ____ that heat as the water vapor _________absorbing, release, condenses (When water evaporates, it uses a lot of energy to break the hydrogen bonds that keep the water molecules near each other in liquid form. When the water vapor condenses, a lot of heat energy is released as a bunch of new hydrogen bonds form),
The _____ of water from humans and other organisms helps keep them cool.evaporation (It does this because heat energy from the body is used to break the hydrogen bonds between water molecules that make up most of your sweat. Since this heat energy is being used to break those hydrogen bonds, your body loses heat, and you stay cooler)
Water reaches its greatest density at ___ degrees Celsius.4 (So in a cold lake in the winter where the warmest water is 4 degrees Celsius, the warmest water would be found at the bottom of the lake and the coldest at the top. In the summer, the opposite happens. Water gets colder as you go deeper.),
If ice didn't float, lakes and oceans would ______.eventually freeze solid because ice would sink, exposing liquid water at the surface to cold winter temperatures and wind instead of insulating it from the cold temperatures.
If the concentration of hydrogen ions in a solution is higher than the concentration of hydroxide ions, the solution will be ____.acidic
The substance shown below is a(n) ____ and an increase in its concentration will cause a(n) ___ in pH., hydrogen ion, drop in pH (to become more acidic),
The substance shown below is a(n) ____ and an increase in its concentration will cause a(n) ___ in pH., hydroxide ion, increase in pH (to become more basic)
., strong acids,
., strong bases
., weak acids,
., weak bases,
The pH scale is kind of like the richter scale (for earthquakes) in that a change of one (such as going from pH 4 to pH 3) represents a ___-fold change in hydrogen ion concentration.10-fold change (for example, pH 3 is 10 times more acidic than pH 4)
A substance that reduces the hydrogen ion concentration of a solution is called a(n) ___.base
Pure water boils at ___ Celsius.100
A substance that increases the hydrogen ion concentration of a solution is called a(n) ___.acid