Thermochemistry Quiz 1

Breaking bonds is a/an _______________ process.

• Endothermic

• Exothermic

• Hydrophilic

• Hydrophobic

Tags

NGSS.HS-PS1-4

Every bond has an energy value associated with it. What are the units for this energy value?

• kilojoules per gram (kJ/g)

• grams per degree celsius (g/C^o)

• kilojoules per mole (kJ/mol)

• moles per degree celsius (mol/C^o)

Tags

NGSS.HS-PS1-4

Use Model 1 on your POGIL.

Calculate the amount of energy needed to break one mole of P-Cl bonds in reaction B.

• Option not given

• 1,297.9 kJ/mol

• 1,611 kJ/mol

• 259.58 kJ/mol

Tags

NGSS.HS-PS1-4

Is graph B showing an endothermic reaction or an exothermic reaction?

• Endothermic

• Exothermic

• Both

• No way to tell

Tags

NGSS.HS-PS1-4

It takes 631 kJ/mol to break a N=O bond. How much energy is required to make a N=O bond?

• No option is correct

• 402 kJ/mol

• 1262 kJ/mol

• -631 kJ/mol

Tags

NGSS.HS-PS1-4

Consider this lewis structure of carbon tetrachloride. Using Model 2 in the POGIL, how much energy is required to break these bonds?  (What is  $\Delta$  H ?)

• 1308 kJ/mol

• 327 kJ/mol

• 1644 kJ/mol

• 2208 kJ/mol

Tags

NGSS.HS-PS1-4

Use Model 2 on your POGIL. What is the change in enthalpy ( $\Delta$  H) of the reaction above?

• 1509 kJ/mol

• -432 kJ/mol

• 485 kJ/mol

• -498 kJ/mol

Tags

NGSS.HS-PS1-4

What term below best describes this reaction?

• Exothermic

• Combustion

• Conservative

• Endothermic

Tags

NGSS.HS-PS1-4

What is the enthalpy of reaction ( $\Delta$ H) of the following reaction? Use Model 2 on your POGIL for bond energies.

• 1209 kJ/mol

• 549 kJ/mol

• -298 kJ/mol

• No option is correct

Tags

NGSS.HS-PS1-4

What is the formula for calculating  $\Delta H$   of a reaction?

•  $\Delta H=H$  (reactants) +  $H$  (products)

•  $\Delta H=H$  (reactants)  - $H$  (products)

•  $\Delta H=H$  (products)  $\div$    $H$  (reactants)

•  $\Delta H=H$  (reactants) x  $H$  (products)

Tags

NGSS.HS-PS1-4