Matter

In which of the following classifications would an iron nail and a copper wire be placed in different groups?

• Float in Water/Sink in Water
• Magnetic/Nonmagnetic
• Conducts Electricity/Does Not Conduct Electricity
• Good Conductor of Heat/Poor Conductor of Heat

Sugar is added to water and stirred unit it completely dissolves.  Which of the following correctly describes something that has happened to the sugar?

• The mass of the sugar decreased.
• The sugar disappeared an no longer exists.
• The sugar is evenly distributed in the water.
• The crystal of sugar have entered the atmosphere.

A student was asked to help pass out cups of hot chocolate to two other students.  A teacher poured the steaming liquid into cups.  Once cup was made of stainless steel and the other was made of thick plastic.  As the student walked across the room, he suddenly put one of the cups on a desk and exclaimed "Ouch".  Which cup did he put down and why?

• He put down the plastic cup because the contents were spilling everywhere.
• He put down the steel cup because it was conducting thermal energy from the liquid to his hand.
• He put down the steel cup because it was insulating thermal energy from the liquid to his hand.
• He put down the plastic cup because it was insulating thermal energy from the liquid to his hand.

A fifth grade class has collected empty cans for recycling.  They have several large bins with aluminum and steel cans, all mixed together.  The two types of can must be separated.  Which of the following techniques could the students use to separate the two types of cans?

• Put the cans in water, the steel cans with float.
• Crush the cans, the aluminum cans will be a different shape.
• Test the cans for their ability to conduct electricity.
• Use a magnet to find and remove the steel cans.

Which statement is true?

• Oil is the most dense substance.
• Corn syrup is less dense than water.
• Oil is less dense than water.
• Oil and corn syrup have the same density but different masses.

The boiling point of water is -

• 0° C
• 50° C
• 200° C
• 100° C

What is the volume of the rock? The water level is displaced from 20 mL to 23 mL with the rock.

• 3 mL
• 23 mL
• 20 mL
• 43 mL

Which property would best separate a mixture of sand and iron filings?

• density
• electrical conductivity
• melting point
• magnetism

Two objects are placed in water.  One sinks and the other floats.  Which conclusion can be drawn from this data?

• one object is magnetic and the other is not
• one object is solid and the other is a liquid
• one object has a greater density than the other
• one object is much larger than the other

A metal spoon was left in a pot of boiling soup.  The cook burned a finger by touching the spoon.  Why did the finger get burned?

• The metal spoon chemically reacted with the cook's hand
• the metal spoon conducted electricity to the cook's hand
• the metal spoon conducted heat to the cook's hand