2.04 Seawater Lab MOD

In the second demonstration, the blue salt water was dense than the fresh water, which is why the blue salt water and yellow fresh water

Part 2: Density & Temperature

Temperature is a measurement of energy. Adding energy to matter increases its temperature.

Matter with a low temperature has low energy, which allows the matter to be closer together (more dense).

Matter with a high temperature has high energy, which keeps the matter spread out (less dense).

Even in solids, all matter is moving a little bit unless the temperature is absolute zero.

How would you expect matter to be moving in cold water?

How would expect matter to be moving hot water?

Consider this model of the second demonstration with the hot red water on top of the blue cold water:

The arrows represent the amount of energy of each molecule.

The red water molecules have long arrows to represent energy.

The blue water molecules have short arrows to represent

energy.

If you were asked to draw molecules in the "After" model, how would you draw their arrows to represent their energy?

The molecules should also be drawn

In the second demonstration, the blue cold water was dense than the red hot water, which is why the colors

Part 3: Salinity (Saltiness) & Temperature

Air temperate affects the amount of ice present in an area of the ocean.

When water freezes, the salt is left behind.

Predict:

When the air is cold and there is lots of ice, the salinity will

When the air is warm and there isn't a lot of ice, the salinity will

Observe the effect changing the temperate has on the salinity and the speed the water sinks due to density.

Watch the video above where the temperature increases. Make sure to notice the change in the salinity gauge and speed of sinking water. What conclusions can you form from your observations?

When the temperature increases, salinity and water sinks because it becomes dense.

and water sinks because it becomes dense.

Part 4: Conclusion

In areas of the ocean where water sinks, the sinking water would have these characteristics:

• Density:

  Temperature:

• Salinity:

Adding salt to the water would the amount of matter in the cup.