Thermochemistry

The reaction:

A + B → C

ΔH = + 25 kJ

is a(n):

• Exothermic Reaction

• Endothermic Reaction

• Neutralization Reaction

• Spontaneous Reaction

Tags

NGSS.HS-PS1-4

Which is true for this enthalpy diagram?

• Exothermic Reaction
• Endothermic Reaction
• ΔH > 0 kJ
• Δ H = 0 kJ

Tags

NGSS.HS-PS1-4

Which is true?

• A   =  ΔH
• B =  activation energy
• A = activation energy
• ΔH < 0

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

The quantity of heat needed to raise the temperature of 1 g of water by 1 degree celsius-

• enthalpy

• specific heat

• joule

• calorie

Tags

NGSS.HS-PS3-4

A piece of metal is heated, then submerged in cool water. Which statement below describes what happens?

• the temperature of the metal will increase

• the temperature of the water will increase

• the temperature of the water will decrease

• the temperature of the water will increase and the temperature of the metal will decrease

Tags

NGSS.HS-PS3-4

What would likely happen if you were to touch the flask in which an endothermic reaction were occurring?

• The flask would probably feel cooler than before the reaction started.

• The flask would probably feel warmer than before the reaction started.

• The flask would feel the same as before the reaction started.

• none of the above

Tags

NGSS.HS-PS1-4

In an exothermic reaction, the energy in the reactants is ________.

• equal to the energy in the products

• greater than the energy stored in the products

• less than the energy stored in the products

• less than the heat released

Tags

NGSS.HS-PS1-4

How can you describe the specific heat of olive oil if it takes approximately 420 J of heat to raise the temperature of 7.0 g of olive oil by 30 degrees?

• greater than the specific heat of water

• less than the specific heat of water

• equal to the specific heat of water

• not enough information given

The specific heat of silver is 0.24 J/g^oC. ow many joules of energy are needed to warm 4.37 g of silver from 25.0^oC to 27.5^oC?

• 2.62 J

• 0.14 J

• 45.5 J

• 0.022 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

The enthalpy of a solution is _____.

• always negative

• always positive

• sometimes positive and sometimes negative

• always 0