Grade 8 Unit A Section 3 Quiz Review

Calculate the density of saltwater if 500g of salt is dissolved in 2000 mL of water.

• 4 g/mL

• 0.25 g/mL

• 0.25 g/cm3

• 4 g/cm3

Calculate the pressure exerted on a piston that has an area of 5m2 if there is 80N of force applied to it.

• 0.06 N

• 0.06 Pa

• 16 N

• 16 Pa

Density is the ratio of....

• friction to flow

• pressure to area

• matter to volume

• solute to solvent

Fill in the blanks. As far as fluids are concerned, liquids are thought to be _________ and gases _________ due to the amount of space between their particles. (Order matters, the first option is for blank one and the second option is for blank two).

• Compressible; Incompressible

• Incompressible; Compressible

• More useful; Less useful

• Less useful; More useful

Pascal's Law states that...

• Pressure is useless in a closed system that has a leak

• Pressure only works in open systems

• Pressure is applied equally in all directions within a closed system

• Pressure is unpredictable and uncontrollable

The force that exists between particles of a viscous fluid is...

• Gravity

• Buoyancy

• Pressure

• Cohesion

True or False. Hot air balloons work because the hot air is less dense that the surrounding cold air.

• True

• False

True or False. If we increase the salt concentration of water, it becomes more dense and the buoyancy decreases.

• True

• False

True or False. If you heat up a fluid, you are decreasing its density.

• True

• False

True or False. If you heat up a solution, you increase its viscosity

• True

• False