Upgrade to remove ads
Only $35.99/year

Density and Salinity Lab

Terms in this set (25)

Definite salinity
measure of amount of salt dissolved in seawater that is expressed as grams/ km
What causes differences in the salinity of ocean water in different areas?
different minearals and organisms produce/contain different amounts of salt

rain, snow, melting ice, and fresh water from rivers lower the salinity of ocean water. Evaporation and the freezing of surface water increase salinity.
Which solution is the least dense? How can you tell?
float
Which water was the most dense? How can you tell?
sank
How does the amount of salt dissolved in water affect its density?
the more salt that is dissolved the denser it is. The water with more salt always sank below the water with less salt. salt water is always more dense than rainwater
What processes lower salinity of ocean water?
rain, snow, melting ice, and fresh water from rivers
What processes increase salinity of ocean water?
evaporation and the freezing of surface water
In the ocean, where would you expect to find water with the greatest salinity? [top, bottom, middle]
bottom of the ocean because it has the greatest density
What can scientists learn from studying the salinity of ocean water?
ocean layers and currents
Put these in order from BOTTOM to TOP
1. warm, slightly salty water
2.cold, slightly salty water
3. cold, very salty water
4.warm rainwater
3,2,1,4
How does temperature effect density? [ie. cold water is ____ than warm water]
cold water is always more dense than warm water
When doing our lab, why was it important that all the water was the same temperature?
COLDER WATER IS MORE DENSE THAN WATER, so this could have affected how the water forms layers
Would you expect the salinity to be high OR low in the ocean off the coast of a hot, dry area? [Think about a process in the water cycle that might be happening to the water]
high because evaporation exceeds preciptation
Predict what density currents are caused by?
water with different salinities and temperature
Whst do you think surface currents caused by?
wind
What is the average salinity of ocean water?
35 parts of salt per thousand parts of water
Where does ocean salt come from?
minerals on land which dissolve into water that flows over them into the ocean
A lake has a salinity of 65 parts per thousand. How many grams of salt does an 1000g sample have?
65g
A lake has a salinity of 330 ppt. This means that 1000g of sample would contain ____g of water and ____g of salt.
330 grams of salt and 670 g of water
If you mixed 50g of salt with 300g of water, what is the resulting salinity in parts per thousand?
143 ppt
List the three density layers of the ocean.
Surface Zone/Mixed Zone, Pycnocline, Deep Ocean
_______ is mainly a function of salinity and temperature.
density
In this layer of the ocean, denisty increases as depth increases
Pycnocline
80% of all ocean water is in this denisty zone.
Deep Ocean
What is a sailinity change or barrier?
Halocline
Sets with similar terms