02.01 Properties of Water
What is the range of the pH scale?
0-14
02.01 Properties of Water
02.01 Properties of Water
What is the pH of water?
7
What types of substance have pH values less than 7?
Acids
Describe adhesion and give an example.
Adhesion is the attraction of water to a different substance.
What is an ionic compound?
Atoms that are ionically bonded together
Does water have a high specific heat? What does this mean?
Yes. This means it can absorb or release a relatively large amount of heat with only a small change in its temperature.
What is a covalent compound?
a molecule
What is density?
a ratio of mass to volume.
Give an example of a substance with a high concentration of H+ ions.
LIquid Drain Cleaner
What are the two main types of chemical bonds?
ionic bond, covalent bond
Why is it important to ecosystems that ice floats in liquid water?
lakes and ponds would freeze from the bottom up.
What is specific heat?
the amount of energy needed to change the temperature of 1 gram of a substance by 1 degree Celsius.
What is heat of vaporization?
the amount of heat energy needed to convert 1 gram of a liquid into a gas.
Define ionic bond.
the attraction of a positively charged ion to a negatively charged ion.
What is being measured in pH?
the concentration of hydrogen ions (H+) in a solution.
Why does water have a high boiling point?
water has a higher boiling point than many other small covalent compounds because of the hydrogen bonding that holds the molecules together.
Define covalent bond.
when two atoms overlap their outer energy levels in order to share pairs of valence electrons.
Does water have a high heat of vaporization?
yes
Ice is less dense than water, which allows it to float on liquid water. Why does this happen? A. Because the ice molecules are spaced closer together B. Because the ice molecules are spaced farther apart C. Because the liquid water molecules are arranged in the shape of a pentagon D. Because the liquid water molecules are arranged against their polarity
B. Because the ice molecules are spaced farther apart
What types of substance have pH values greater than 7?
Bases
Give an example of a substance with a low concentration of H+ ions.
Battery Acid
Describe capillary action and give an example.
Capillary action is movement of water through a narrow tube.
Describe cohesion and give an example.
Cohesion is an attraction of same particles.
Water can travel upwards in the small tubes within plants. This is: A. Surface Tension B. Adhesion C. Cohesion D. Capillary Action
D. Capillary Action
What happens when water freezes?
Expands
What is the chemical formula for water?
H2O
Properties of water
Properties of water
Describe surface tension and give an example.
Surface tension is a measure of how difficult it is to stretch or break the surface of a liquid.
Define vaporize.
To convert a substance from a liquid to a gas.
In the specific heat example, which liquid has the highest specific heat? (Remember that the more heat it takes to make the liquid raise 1 degree in temperature, the higher the specific heat it has.)
Water
Describe hydrogen bonding.
attraction between water molecules
Why is water considered to be a universal solvent?
because many different substances dissolve well in water.
Why is ice less dense than liquid water?
because there are fewer water molecules present in ice.
What type of bonds and atoms form a water molecule?
covalent bonds