8th Grade Science 2.07

Which activity involves using fossil fuels directly or indirectly?

• cooking hot dogs
• walking to school
• using crayons to color
• eating fresh fruit as a snack

The first law of thermodynamics states that  Change in Energy equals Q -W,  How is this also a statement of the principle of conservation of energy?

• The heat that flows into the system is transformed into work and a change in internal energy.
• Energy is changed into work
• it doesn't demonstrate conservation of energy

What is the part of the steam engine that does the work?

• The cylinder
• The piston

What existed originally that became the deposits of fossil fuels?

• coal
• vast amounts of plant life that existed before dinosaurs
• dinosaurs

Which of the following is a reason that drivers prefer gasoline-powered engines to electric motors?

• Gasoline-powered cars are better for fast acceleration and traveling at high speeds
• Gasoline-powered engines are cheaper
• Gasoline-powered engines look better
• Gasoline-powered engines use less fossil fuels

The first law of thermodynamics states that The Change in Energy = Q -W. Is this also a statement of the principle of conservation of energy?

• Yes, energy is exactly the same
• No, energy is lost
• Yes, the heat that flows into the system is used to change the internal energy of the gas and becomes work done by the piston.
• No, work has to be done

How does a steam engine do work?

• Steam enters a cylinder and pushes a piston.
• The piston pushes the steam out
• Fossil fuels are used
• Steam enters the engine and pushes the cylinder

How are fossil fuels used in the harvesting of fresh apples from an apple tree?

• Fossil fuels clean the apples
• Fossil fuels can't be used harvesting apples
• Fossil fuels power the machine that shakes the tree so that the apples fall to the ground.

How much ancient plant debris is necessary to form one foot of coal?

• 10 feet of plant debris
• 20 feet of plant debris
• 100 feet of plant debris
• 200 feet of plant debris

What is the main difference between an internal combustion engine and an external combustion engine?

• The burning of fuel occurs inside the cylinder with the piston in an extrenal combustion engine
• The burning of fuel occurs inside the cylinder with the piston in an internal combustion engine.
• They are both the same