Enthalpy and Thermochemistry Test

A 4.0 g sample of iron was heated from 0°C to 20.°C. It absorbed 35.2 J of energy as heat. What is the specific heat of this piece of iron?

• 2816 J/gC

• 2.27 J/C

• 0.44 J/gC

• 2.27 J/gC

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The Greek letter Δ stands for

• heat stored in

• rate of

• change in

• mass of

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

• Endothermic

• Exothermic

• Neutral

Tags

NGSS.HS-PS1-4

The following graph indicates a...

• All the Reactions

• No Reaction

• Exothermic Reaction

• Endothermic Reaction

Tags

NGSS.HS-PS1-4

_________ (H) is the heat content of a system at constant pressure.

• joule

• enthalpy

• entropy

• heat of rxn

(Hess's Law)Calculate the ∆H for the following reaction: 2H₂O₂ →  2H₂O  + 1 O₂ 
You are given these two equations:
2H₂  +  O₂ → 2H₂O            ∆H  =  -572 kJ
H₂  +  O₂  →  H₂O₂            ∆H  =  -188 kJ 

• ∆H  =  -948 kJ 

• ∆H  =  -196 kJ 

• ∆H  =  -384 kJ 

• ∆H  =  -188 kJ 

Tags

NGSS.HS-PS3-1

Is this equation endo- or exo-thermic?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Find the change in enthalpy over the following two-step equations. N₂ (g) + O₂ (g) --> 2 NO (g) ΔH = 180kJ 2 NO (g) + O₂ (g) --> 2 NO₂ ΔH = -112kJ

• -292 kJ

• -68 kJ

• 292 kJ

• 68 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

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

• Reactant

• Product

Tags

NGSS.HS-PS1-4

The diagram represents which type of reaction

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4