Thou Shalt Not Forget Thermo

In an exothermic reaction, the sign of ΔH is ____ and the reaction feels ______

• (-), hot

• (+), hot

• (-), cold

• (+), cold

Breaking bonds is _________________. Forming bonds is ______________________

• endothermic, exothermic

• exothermic, endothermic

Tags

NGSS.HS-PS1-4

If a reaction is exothermic, then the bonds formed in the products are ___________________ than the reactant bonds.

• stronger/more stable

• weaker/less stable

Tags

NGSS.HS-PS1-4

If a reaction is endothermic, then the bonds formed in the products are ___________________ than the reactant bonds.

• stronger/more stable

• weaker/less stable

Tags

NGSS.HS-PS1-4

According to Hess' Law, if you double the coefficients of a reaction, ΔH will ________________________

• Stay the same

• Double

• Quadruple

• Halve

According to Hess' Law, if you reverse a reaction, ΔH will ________________________

• Change signs

• Double

• Be inversed

• Halve

_____ Carbon-Carbon single bond/s are formed

• 6

• 2

• 3

• 10

Bond enthalpy is the amount of energy is takes to break __________ of a bond.

• one mole

• one gram

• the activation energy

• the binding energy

Tags

NGSS.HS-PS1-4

What are the units of ΔH_rxn?

• kJ

• J

• kJ/mol

• J/mol

Endothermic

• absorb energy

• release energy

Tags

NGSS.HS-PS1-4