Science 8 - Unit A Practice

Using the nutritional label above, calculate the concentration of sugar in one serving of juice.

• 0.10 g per 100 mL

• 10 g per 100 mL

• 25 g per 100 mL

• 225 g per 100 mL

The most likely reason for why Jordan's sugar took longer to dissolve is

• Sugar dissolves faster in cold water

• Jordan's surgar was cubed

• Taylor's container was larger

• Taylor didn't stir their coffee

The milk has a ___i___ viscosity than the shampoo because the milk has ___ii___ resistance to flow.

The statement above is best completed by:

• i: lower

  ii: more

• i: lower

  ii: less

• i: higher

  ii: more

• i: higher

  ii: less

Which metal is the student most likely working with?

• Aluminum

• Copper

• Gallium

• Tin

Answer explanation

mass = 22.2 g

You must find the displacement of water.

10 mL - 6 mL = 4 mL

To find the density, divide the total mass by the total amount of water that was displaced.

22.2 g / 4 mL = 5.6 g/mL. Gallium is the closest at 5.91 g/mL

In order for a liquefier to convert hydrogen gas to its liquid state, the liquefier most likely

• runs electricity through the gas

• exerts pressure to compress the gas

• cools the gas to its boiling point

• dissolves the gas in water

Which of the following is the primary advantage of converting liquifying hydrogen before

transport?

• Hydrogen gas is dangerous to transport.

• Hydrogen is only useful in its gaseous state.

• Trucks can carry more hydrogen as a liquid than a gas.

• Liquid hydrogen doesn't require special storage equipment.

Carbon dioxide gas can be dissolved in water because the particles in water are ___i___ than the particles in carbon dioxide, resulting in water having a ___ii___ density, compared to the carbon dioxide gas.

The statement that is best completed by the answers are:

• i: closer together

  ii: lower

• i: further apart

  ii: greater

• i: closer together

  ii: greater

• i: further apart

  ii: lower

When carbon dioxide gas located in a 2.0 m cylinder is compressed with 10 N of force, the resulting pressure in the cylinder would be

• 0.20 Pa

• 5.0 Pa

• 12 Pa

• 20 Pa

The students that chose to increase the ___i___ noticed that the height of the boat above the water ___ii___.

The statement above is best completed by the answer:

• i: salt concentration of the water

  ii: decreased

• i: volume of the water

  ii: increased

• i: weight of the boat

  ii: increased

• i: temperature of the water

  ii: decreased