TSNF Chapter 5

What is the characteristic of exothermic reactions?

• Temperature goes down

• Feels hot

• Feels cold

• Heat is a reactant

What is the equation for calculating enthalpy change?

• AHxn = Bonds broken + Bonds formed

• AHxn = Bonds broken / Bonds formed

• AHxn = Bonds formed - Bonds broken

• AHxn = Bonds formed / Bonds broken

Which process is endothermic?

• Neither breaking nor forming bonds

• Forming bonds

• Breaking bonds

• Both breaking and forming bonds

What is the equation for calculating enthalpy change?

• ΔΗ = ΔΗ, products - Hreactants

• ΔΗ = ΔΗ, products + Hreactants

• ΔΗ = ΔΗ, products * Hreactants

• ΔΗ = ΔΗ, products / Hreactants

If a reaction is exothermic, what can be said about the bonds formed in the products?

• They are more reactive than the reactant bonds

• They are weaker than the reactant bonds

• They are less stable than the reactant bonds

• They are stronger than the reactant bonds

What happens to DH when a reaction is doubled?

• DH remains the same

• DH is halved

• DH becomes zero

• DH is doubled

What happens to the sign of DH when a reaction is reversed?

• The sign of DH remains the same

• The sign of DH becomes zero

• The sign of DH becomes negative

• The sign of DH becomes positive

What happens to DH when reactions are added?

• DH is divided

• DH is multiplied

• DH is added

• DH is subtracted