Matter WK 3 5.6A

At a pool party, your friend challenges you to predict which items will float in the water. The group of items that will all float is (a)  

• Cork, Sponge, Plastic Bottle Cap
• Stone, Steel Rod, Rubber Ball, Copp
• Leaves, Glass Marble, Aluminum Foil
• Cork, Nail, Wax, Sand

For an investigation a teacher dropped a bolt into a container of maple syrup and asked students to remove it without touching the syrup. The students first tried to use a strong magnet to remove the bolt, but it remained on the bottom of the container. They finally poured the syrup into another container to get the bolt out. Which statement BEST describes some of the bolt’s physical properties?

• The bolt is magnetic and has the same density as the maple syrup.

• The bolt is nonmagnetic and less dense than the maple syrup.

• The bolt is magnetic and less dense than the maple syrup.

• The bolt is nonmagnetic and more dense than the maple syrup.

Tags

NGSS.MS-PS1-2

A student reads the label on the bottle of salad dressing shown below. 

Why do you need to shake the salad dressing well before using it? Explain your reasoning. 

Tags

NGSS.MS-PS1-2

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?

• 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 be crumbled up for removal by the pool filter.

• The foam cups are less dense than water, so they can be removed from the surface by skimmers.

Jennifer has a piece of copper wire, a rubber band, and a piece of wood. She connects each to a simple circuit with a battery and light bulb. How can she compare the copper wire, rubber band, and piece of wood based on their ability to conduct electricity, and what does this tell Jennifer about their properties? 

Electric wires are often coated with plastic to prevent dangerous sparks that could start fires. This is especially important in homes and buildings where many wires are close together. What property of plastic makes it a good material for covering electrical wires?

• Plastic is a strong material that can hold wires in place.

• Plastic does not allow electric current to pass through it easily.

• Plastic melts quickly when it gets hot, stopping the current.

• Plastic is flexible, so it can bend around corners.

The diagram below illustrates how the temperature of 80°C water changed when equal amounts were placed in four different cups and left on the counter for two hours. Based on the image, which material is the BEST insulator of thermal energy?

• Metal

• Foam

• Plastic

• Glass

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Students are testing three different materials, copper wire, a rubber band, and a piece of wood, by connecting each one into a simple circuit with a battery and a light bulb. They observe that the light bulb only turns on when the copper wire is used. When they try the rubber band and the wood, the bulb stays off. What conclusion can the students draw about the properties of these materials based on the experiment?

• Rubber and wood are better conductors than copper wire.

• The light bulb only works with materials that are shiny.

• Only materials that are flexible can complete a circuit.

• Copper wire is a conductor, while rubber and wood are insulators.

The image below shows glass beakers, Q, R, S, and T, with different materials in each beaker. How can we determine which material is the densest?

• Combine beakers Q and R and see which material floats to the top.

• Combine beakers Q and S and see which material floats to the top.

• Combine beakers S and T and see which material sinks to the bottom.

• Combine beakers R and T and see which material sinks to the bottom.

Tags

NGSS.MS-PS1-2

Which of the following materials are known to exhibit magnetic properties? Select TWO correct answers.

• Wood

• Nickel

• Plastic

• Aluminum

• Cobalt

Tags

NGSS.MS-PS2-3