Thermochemical Equations

Given the thermochemical equation, calculate the heat evolved when 74.6 g of sulfur dioxide (molar mass = 64.07 g/mol) is converted to sulfur dioxide.

• -115 kJ

• 115 kJ

• -115.39 kJ

• 115.39 kJ

Tags

NGSS.HS-PS1-4

Using the thermochemical eq. given, calculate the heat evolved when 266 g of white phosphorus burns in air.

• -6.47 x 10^3 kJ

• -6468 kJ

• 6.47 x 10^3 kJ

• 6468 kJ

Tags

NGSS.HS-PS1-4

The change of enthalpy is usually expressed in___________.

• kilojoule

• joule

• kilogram

• newton

ΔH is the same thing as:

• temperature

• q

• m

• C

Tags

NGSS.HS-PS1-4

ΔH means:

• temperature

• calorimetry

• enthalpy

• syntropy

Tags

NGSS.HS-PS1-4

A positive ΔH means the reaction is:

• complete

• at equilibrium

• exothermic

• endothermic

Tags

NGSS.HS-PS1-4

A positive ΔH means that:

• In order for the reaction to happen, heat must be input. It is exothermic

• In order for the reaction to happen, heat must be input. It is endothermic.

• When the reaction happens, heat is released. It is exothermic

• When the reaction happens, heat is released. It is endothermic

Tags

NGSS.HS-PS1-4

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

• Reactant

• Product

Tags

NGSS.HS-PS1-4

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Tags

NGSS.HS-PS1-4

Is the following exothermic or endothermic?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4