WorksheetsUnit 2: Systems at Sea
Total questions: 52
Worksheet time: 28mins
Match each molecular formula to its correct composition.
Two hydrogen atoms and one oxygen atom
H2O
One hydrogen atom and two oxygen atoms
HO2
Two hydrogen atoms and two oxygen atoms
H2O2
One oxygen atom and one hydrogen atom
HO
What mass of salt (in grams) is required to prepare a solution with a concentration of 35 ppt using 150 ml of water?
5.25 g
0.525 g
52.5 g
0.0525 g
What is the typical pH level of seawater under normal conditions?
7.5-7.8
8.1-8.2
8.4-8.6
7.9-8.0
What effect does evaporation have on the concentration of salt in seawater?
Evaporation reduces the concentration of salt
Evaporation increases the concentration of salt
Evaporation does not change the concentration of salt
Evaporation balances the concentration of salt
During a marine biology class, Scarlett and Aiden were discussing ocean layers. They learned that the area where salinity changes significantly with depth is called the
Thermocline
Pycnocline
Halocline
Incline
How do water molecules behave as they approach the freezing point?
They move faster and disperse
They form a rigid lattice structure
They become gaseous
They dissolve into other substances
What happens to the concentration of dissolved oxygen as you go deeper into the ocean?
It increases
It decreases
It stays the same
It varies unpredictably
At what depth is the oxygen minimum zone most commonly located?
150m
250m
500m
450m
Where is ocean water most likely to be the coldest?
Near the equator
At the mid-latitude zones
Near the water's surface
Near the poles
What is the primary factor affecting the stratification of ocean water layers?
Salinity
Mass
Temperature
Pressure
Match the following seawater salinity levels with their typical values.
32 ppt
Salinity of brackish seawater
34 ppt
Salinity of the Red Sea
35 ppt
Average salinity of ocean water
36 ppt
Salinity of the Mediterranean Sea
During a geography class, Samuel and Charlotte were discussing the density of different bodies of water. Which of the following bodies of water is the most dense (assuming the temperature of each is the same)?
Red Sea 42 ppt
Atlantic Ocean 33 ppt
Gulf of Mexico 16 ppt
Mobile Bay 9 ppt
What is the name of a natural underground reservoir where freshwater and saltwater meet, creating a visible halocline?
Thermocline
Blue Hole
Lagoon
Cenote
Which color of light penetrates the ocean the furthest?
Blue
Green
Red
Violet
During the rainbow lab, we observed the effect of salinity on water density. Based on the lab results, what can be concluded about the relationship between salinity and water density?
Higher salinity results in lower water density.
Salinity does not alter the density of water.
Increased salinity leads to higher water density.
Salinity causes water to freeze at a higher temperature.
Which bond connects water molecules?
Hydrogen Bond connects hydrogen atoms.
Covalent Bond connects oxygen atoms.
Hydrogen Bond connects water molecules.
Covalent Bond connects water molecules.
An ocean is a large body of salt water. Ocean water is made up of:
water and sand
gases, water, and dissolved solids
salt, sand, and water
Which elements (besides hydrogen and oxygen) are most abundant in the oceans?
Sodium and Chlorine
Magnesium and Chlorine
Sodium and Sulfur
Sulfer and Calcium
What color of light is absorbed closest to the ocean surface? (not able to be seen below 10 meters)
Blue
Red
Green
Yellow
In this model, what is the order of layers from most dense to least dense?
Blue, green, yellow, red
Blue, yellow, green, red
Green, Blue, yellow, red
Red, yellow, green, blue
This zone of the ocean gets the most sunlight, so it has the most plants that need to undergo photosynthesis.
Surface Zone
Transition Zone
Deep Zone
Nora, Anika, and Scarlett are conducting an experiment for their science project. They learned that if human activities continue as they are, the ocean is predicted to become more
acidic
basic
neutral
ionic
Carbonic acid makes oceans more (a) which makes it (b) for shelled sea creatures to make (c) food
Imagine Daniel, Aria, and Maya are conducting a science experiment on ocean water. If they continue to add carbon dioxide to the water at the same rate, what is the predicted change in the ocean's acidity?
More acidic
More basic
Neutral
Ionic
During a school trip to the aquarium, Evelyn, James, and Mason were discussing the impact of ocean acidification. They wondered which organism is most affected by this phenomenon. Can you help them?
Sharks
Coral reefs
Jellyfish
Seahorses
What does the blue line show?
CO2 in the water
Air temperature
Carbon emissions
pH of the water
What does the orange line show?
CO2 in the water
Air temperature
Carbon emissions
pH of the water
What was the pH around 1989?
about 8.1
about 7.5
about 8.5
about 8.9
What burns that creates ocean acidification?
rocks
plants
fossil fuels
coal
What do some marine creatures do with the carbonate ion?
use it as a food source
use it as a defense mechanism
use it to build shells and exoskeletons
use it to cool body temperatures
Bacteria fix nitrogen from the atmosphere into a form plants can use.
True
False
What happens when too much Nitrogen finds its way to the ocean?
Algae Bloom
Acid Precipitation
Nitrogen Fixation
Decomposition
Hypoxia is...
An increase in dissolved oxygen
A decrease in dissolved oxygen
An increase in density
A decrease in density
Which zone is known as the lit zone where light easily penetrates?
photic zone
aphotic zone
Which is absorbed at greater depths?
red and yellow visible light
blue and green visible light
What is seawater's thermocline influenced by?
temperature
salinity
density
Density ________ with increasing depth.
increases
decreases
stays the same
What are the two factors that influence density?
temperature and salinity
temperature and depth
salinity and latitude
temperature and latitude
