Combustion, Heat, Energy

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

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

• The chemical potential energy stored in charcoal is higher than the chemical potential energy stored 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.

Heat flows ​ (a)   the flame​ (b)   the pan and the egg

• from
• to

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

What type of reaction is this?

• Exothermic

• Endothermic

• Nuclear

Tags

NGSS.HS-PS3-4

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

chemical potential energy of reactants

exothermic

chemical potential energy of products

endothermic

energy needed to break bonds

Tags

NGSS.HS-PS1-4

This diagram represents an _____ reaction.

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

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

• 3
• 2
• 1
• 4

Which equation does not obey the law of conservation of matter

• 2 NaCl --> 2 Na + Cl₂

• CH₄ + O₂ --> CO₂ + H₂O

• NaHCO₃ + HCl --> NaCl + H₂O + CO₂

Tags

NGSS.HS-PS1-7