Combustion, Heat, Energy

While burning coal and charcoal, you notice that coal releases more heat than charcoal. What does that mean?

• The elastic energy is higher in charcoal than in coal.

• The elastic energy is lower in charcoal than in coal.

• The chemical potential energy is higher in charcoal than in coal.

• The chemical potential energy is lower in charcoal than in coal.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Charlie is frying an egg in a pan located over a gas burner. He develops a model of heat flow. What statement best describes heat flow in this process?

• Heat flows from the egg to the surroundings.

• Heat flows from the egg to the pan.

• Heat flows from the flame to the egg.

• Heat flows from the egg to the flame.

Tags

NGSS.HS-PS3-4

The highest potential energy is reached at point ​ (a)   . The highest kinetic energy is reached at point ​ (b)  

• A
• B
• C

Tags

NGSS.HS-PS3-1

Energy form based on the movement of molecules and atoms within an object

• thermal

• elastic

• chemical

• nuclear

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-2

NGSS.HS-PS3-4

What type of energy is this?

• Radiant Energy

• Mechanical Energy

• Chemical Energy

• Thermal Energy

Tags

NGSS.HS-PS3-4

A fire would described as ​ (a)  

• exothermic
• endothermic

Tags

NGSS.HS-PS1-4

A student observes that her hand feels cold when she is holding a test tube in which a reaction takes place. This reaction is best described as​ (a)  

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What type of reaction is shown in this diagram?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Label the diagram

c

d

e

energy needed to break bonds

exothermic

product energy

endothermic

reactant energy

Tags

NGSS.HS-PS1-4

Balance the equation: ​ N₂ + ​ (a)   H₂ --> ​ (b)   NH₃

• 3
• 2
• 1
• 4