Matter

Students collected data on several objects and recorded the data in a T-chart.
Which object would replace the question mark to complete the chart?

• Glass marble
  
• Aluminum can
• Rubber eraser
• Wool sock

Boiling water was placed in containers made of four different materials.
Based on the data, which material was the best conductor of heat?

• material 1
• material 2
• material 3
• material 4

water and oil are poured into the same container. An object is added. The materials are allowed to sit and their final positions are shown in the illustration.
What is the most reasonable conclusion that can be made from this test?

• The object has the lowest density.
• Water is less dense than oil.
• The object is less dense than water.
• Oil has the highest density.

The table shows how the temperature changed over six minutes of water samples kept in four different containers.
Which container was made of the best heat insulator?

• Container 1
• Container 2
• Container 3
• Container 4

Students placed three spheres in a tank of water.Which of the following can be concluded based on the results?

• Sphere 1 is more dense than Sphere 3.
• Sphere 2 is less dense than Sphere 3.
• Sphere 3 is less dense than Sphere 2.
• Sphere 2 is less dense than Sphere 1.

A group of students have a block of aluminum 10 cm by 10 cm by 10 cm. They conducted some tests and recorded their results.
The students found a smaller block of aluminum that is only 1 cm by 1 cm by 1 cm. Which property do we expect to observe in the smaller block? The smaller block will -

• have a mass of 2.8kg
• float in water
• conduct electricity
• be attracted to a magnet

A teacher gives a student four clear sealed containers. Each container holds a different substance. The student records some observations about the substance in each container. Based on these observations, which container most likely holds only gas?

• Container 1
• Container 2
• Container 3
• Container 4

Students filled a graduated cylinder with water and oil. Next they placed two samples, Substance X and Substance Y, in the same graduated cylinder. The illustration shows the final positions of all these materials.
What conclusion can be drawn from this observation?

•  Water is less dense than oil.
• Substance Y is less dense than oil.
• Oil is more dense than water.
• Substance X is less dense than water.

Some students investigate the properties of four objects using a hand lens, a magnet, and a beaker containing water. Their observations are recorded in the table. Which statement identifies a property that could be used to classify these objects into two different groups?

• Density can be used to separate objects that sink in water from objects that do not.
• Magnetism can be used to separate objects that are attracted by a magnet from objects that are not.
• Solubility can be used to separate objects that dissolve in water from objects that do not.
• Physical state can be used to separate objects that are solids from objects that are not.

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