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

• (-), hot

• (+), hot

• (-), cold

• (+), cold

Freezing is an _________________________ process

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

Vaporizing is an _________________________ process

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

Breaking bonds is _________________. Forming bonds is ______________________

• endothermic, exothermic

• exothermic, endothermic

Tags

NGSS.HS-PS1-4

ΔH_rxn = ΔH_{_________________} − ΔH_{_________________}

• products, reactants

• reactants, products

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

Tags

NGSS.HS-PS1-4

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

• Change signs

• Double

• Be inversed

• Halve

Tags

NGSS.HS-PS1-4

_____ Hydrogen-Hydrogen single bond/s are broken and _____ Carbon-Hydrogen single bond/s formed

• 6; 8

• 2; 8

• 2; 10

• 6; 10

Tags

NGSS.HS-PS1-4