Thermochemical Enthalpy

If the enthalpy ter (ΔH) is negative the reaction is ____.

• Endothermic
• Exothermic
• Neutral

Tags

NGSS.HS-PS3-1

H₂ + ½ O₂ --> H₂O + 285kJ is an example of a(n)

• Electrical equation
• Heat equation
• Thermochemical equation

Tags

NGSS.HS-PS1-4

If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.

• Reactant
• Product

Tags

NGSS.HS-PS3-1

C+ O₂ --> CO₂ + 60kJ, what is the value for ΔH for the reaction?

• +60
• -60
• there is no way to know

Tags

NGSS.HS-PS1-4

The diagram represents which type of reaction

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

In an endothermic reaction, the sum of the heats of formation of the products are____than the sum of the heats of formation of the reactants. Hint: is ΔH + or -? This about how you calculate ΔH

• less than
• greater than
• equal to

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

Calculate the enthalpy of the following reaction:
Ca(OH)₂ -> CaO + H₂O
ΔHf in kJ/mol:  
      Ca(OH)₂  -983.2
        CaO         -634.9
        H₂O         -285.5

• 62.8 kJ
• -62.8 kJ
• -1840.6
• 1840.6

Tags

NGSS.HS-PS1-4

What do you call a

part of the universe on which you focus attention?

• System

• Surroundings

• Specific

• Entropy

• Wakanda

When heat moves

from surroundings INTO a system, we call that….?

• Endothermic

• Exothermic

• Thermal

• Long Underwear

• Covalent Bonding

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

When heat moves

from the system to the surrounding , this is considered __________ .

• exothermic change

• endothermic change

• thermal change

• potential energy

• kinetic energy

Tags

NGSS.HS-PS3-4