5.5ABC

5.5A - A teacher mixes a white powder into a beaker of water. The powder cannot be seen in the water. The teacher then heats the mixture until the water evaporates and the powder can be seen again. Which property of the powder is the teacher demonstrating?

• Soluability
• Density
• Conductivity
• Mass

5.5A: Molecules in a solid object are...

• spread far apart
• very close together
• flowing around and near each other

5.5A - This is a picture of oil and water.  Why does the oil float on top of the water?

• The water is less dense than the oil so it floats on top of the oil.
• The oil is less dense than the water so it floats on top of the water.
• The oil is more dense than the water so it sinks.
• The oil is less dense than the water so it sinks.

5.5C - A mixture of beads was placed in a container, as shown below. The beads are of various sizes, and each one is made of plastic,glass, or steel. The mixture would be easy to separate because all the beads —

• are less dense than water
• are solids
• have the same mass
• are attracted to a magnet

5.5C - A small bowl contains a mixture of toothpicks and glass marbles. The easiest way to separate the mixture without touching it would be to - 

• add glue to the mixture
• place a magnet in the bowl
• pour the mixture into a paper cone
• add water to the bowl

Which of these is a good conductor of electricity? 

• Glass
• Metal
• Rubber
• Plastic

Objects that blow into a swimming pool or that are dropped into the pool by swimmers need to be removed. These objects include foam cups, keys, and coins. Which of the following explains a useful method for removing some of these objects? (5.5A)

• The keys and coins are less dense than water, so they can be easily picked up off the bottom of the pool by divers.

• The foam cups have the same density as water, so they can crumbled up for removal by the pool filter.

• The foam cups are less dense than water, so they can be removed from the surface with a pool cleaning net.

• The keys and coins have the same density as water, so they can washed away when the pool is drained.

Tags

NGSS.5-PS1-3

A student classifies the objects shown based on their physical properties. Which property cannot be used to classify these objects into more than one group? (5.5A)

• Magnetism

• Mass

• Electrical conductivity

• Solubility in water

Tags

NGSS.5-PS1-3