Enthalpy of Reaction — Quiz Answers

If a chemical reaction is reversed, what happens to the enthalpy of the reaction?

When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided that

Consider these intermediate chemical equations. Ca times s plus CO sub 2 times g plus 1 half cap o sub 2 g rightarrow Ca CO sub 3 s triangle cap h sub 1 is equal to negative 812 point 8 kJ 2 Ca s plus cap o sub 2 times g rightarrow 2 Ca cap o s triangle cap h sub 2 is equal to negative 1 comma 269 point 8 kJ The final overall chemical equation is CaO times s plus CO sub 2 times g rightarrow Ca CO sub 3 s . When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

Consider these intermediate chemical equations. 2 Na s plus Cl sub 2 times g rightarrow 2 NaCl s 2 Na sub 2 cap o s rightarrow 4 Na s plus cap o sub 2 times g In the final chemical equation, NaCl and cap o sub 2 are the products that are formed through the reaction between Na sub 2 cap o and Cl sub 2 Before you can add these intermediate chemical equations, you need to alter them by

Consider these intermediate chemical equations. NO times g plus cap o sub 3 times g rightarrow NO sub 2 times g plus cap o sub 2 times g triangle cap h sub 1 is equal to negative 198 point 9 kJ 3 halves cap o sub 2 g rightarrow cap o sub 3 times g triangle cap h sub 2 is equal to 142 point 3 kJ cap o times g rightarrow 1 half cap o sub 2 g triangle cap h sub 3 is equal to negative 247 point 5 kJ What is the enthalpy of the overall chemical equation NO times g plus cap o times g rightarrow NO sub 2 times g ?

What is the final chemical equation from these intermediate chemical equations? cap p sub 4 cap o sub 6 s rightarrow cap p sub 4 times s plus 3 cap o sub 2 g cap p sub 4 times s plus 5 cap o sub 2 g rightarrow cap p sub 4 cap o sub 10 s

What is enthalpy?

Consider these intermediate chemical equations. CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o g 2 cap h sub 2 cap o g rightarrow 2 cap h sub 2 cap o l Which overall chemical equation is obtained by combining these intermediate equations?

Consider these intermediate chemical equations. 2 cap p s plus 3 Cl sub 2 g rightarrow 2 PCl sub 3 l PCl sub 3 times l plus Cl sub 2 times g rightarrow PCl sub 5 times s When you combine the intermediate chemical equations, which substance do you cancel out?

Consider the intermediate chemical equations. CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o g triangle cap h sub 1 is equal to negative 802 kJ 2 cap h sub 2 cap o g rightarrow 2 cap h sub 2 cap o l triangle cap h sub 2 is equal to negative 88 kJ The overall chemical reaction is shown. CH sub 4 times g plus 2 cap o sub 2 g rightarrow CO sub 2 times g plus 2 cap h sub 2 cap o l triangle cap h sub 2 is equal to negative 890 kJ What is the correct enthalpy diagram using the Hess law for this system?