Energy and Good

What will happen to the wax pellets on the wire and why?

• They will remain unchanged because only the wire will be heated but the heat is not transferred to the wax.

• They will soften and melt completely as the heat from t the flame will be transferred to the wax pellets by conduction through the wire.

• They will soften and melt completely as the heat from the flame is transferred to the wax pellets by convection through the air.

• They will soften and melt completely as heat from the flame is transferred by radiation through the air.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

An experiment is set up in a lab to demonstrate conductivity. Three cylindrical rods of copper, iron, and glass are placed in a pan of hot water with one end up. A wax bead is placed on the end of each cylindrical rod. After a few minutes, the wax bead on one rod melts. This continues until the wax has melted on all three rods.

Using the table, which material melted the wax bead in order from first to last?

THERMAL CONDUCTIVITY measures a substance's ability to conduct heat.

• glass, iron, copper

• iron, copper, glass

• copper, glass, iron

• copper, iron, glass

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which type of energy would be put into a hair dryer being used to dry your hair and why?

• electrical; because electrical energy is required to operate it

• kinetic; because kinetic energy heats up the air

• sound; because sound energy is created when it is operated

• thermal; because thermal energy is created when it is operated

Which of the following actions could a person do to show how heat moves through conduction?

• A camper melts some marshmallows by holding them over a campfire.

• A person uses an electric heater to warm up on a cold evening.

• A chef waits as pasta noodles rise and fall in a pot of boiling water.

• A farmer heats up a metal rod to use as a brand by placing it into a fire.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Given the specific heat information presented, which substance would make the BEST material to create a pan for cooking and why?

• Tin – because it has a low specific heat, which means it conducts heat the best.

• Aluminum – because it has a high specific heat, which means it conducts heat the best.

• Copper – because it has a mid-level specific heat, which means it is a good insulator.

• Iron – because it has a mid-level specific heat, which means it is a good conductor.

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which of the following is a reliable investigation to study how heat is transferred by conduction?

• Investigating why the water in a pool heats up as the sun shines on it.

• Investigating why the upstairs of a house is warmer than the basement.

• Investigating why the handle of a pot will heat up as food is cooking over an open fire.

• Investigating why the bottom of a loaf of bread browns faster than the top of a loaf of bread as an oven temperature

  is increased.

Tags

NGSS.MS-PS3-3

Marcus wants to investigate how thermal energy can be transferred by convection.

Which of the following scenarios would be a reasonable investigation?

• Studying the transfer of heat by sticking a metal spoon into a cup of hot water to determine if the handle of the spoon will heat up or not.

• Studying the transfer of heat by taking the temperature of the air beside a fire and farther away from a fire to determine how far away the heat can be detected.

• Studying the transfer of heat by measuring the temperature of the water at the top of a body of water and at the bottom to determine which way the warm water will flow.

• Studying the transfer of heat by taking the temperature on the outside and the inside of a wooden door facing the sun to determine if the heat can move through the door.

Tags

NGSS.MS-PS1-4

Based on the table, which substance would be the BEST conductor of thermal energy and why?

• chromium; because it is a transition metal with the highest specific heat value

• copper; because it is a transition metal and is used in plumbing for hot water lines

• iron; because it is a transition metal that is widely used in construction materials

• silver; because it is a transition metal with the lowest specific heat value

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which material would be good to use as an insulator for a substance that needs to be kept at a high temperature and why?

• air; because the gas molecules are spaced far apart which transfers heat large distances

• concrete; because the tiny air pockets in the material hold the heat in well

• iron; because the metallic atoms conduct heat well around the substance

• water; because it has a high specific heat capacity value

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-4

Which example BEST demonstrates the conversion of nuclear energy into electrical energy?

• Friction of water molecules in a cloud causes a large buildup of electrons in one area. When the voltage is large enough, a lightning bolt occurs.

• In a hydro-electric dam, a large amount of water molecules flows downward from a water reservoir, turning turbines that generate electricity.

• A fully charged battery is attached to a closed electrical circuit, causing electrons to flow through the circuit.

• A reactor generates heat by splitting uranium, creating steam that turns turbines to generate electricity.