General Chemistry | Enthalpy of Reaction (ΔH_rxn) [Example 1]

General Chemistry | Enthalpy of Reaction (ΔH_rxn) [Example 1]

Assessment

Interactive Video

Science, Chemistry, Physics

University

Hard

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In this video, Kevin Tokoph from Catalyst University explains how to calculate the enthalpy of reaction (delta H) using an example of glucose combustion. He discusses the importance of knowing the heats of formation for each species involved and explains the concept of standard states. The video provides a detailed calculation process, emphasizing the need to correctly handle coefficients and signs. The video concludes with a reminder to look up necessary data and a preview of future topics, including Hess's law.

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7 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary purpose of calculating the enthalpy of reaction?

To calculate the pressure change in a reaction

To find the overall energy change in a reaction

To determine the speed of a reaction

To measure the temperature change in a reaction

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is the enthalpy of formation for oxygen gas considered zero?

Because it is a liquid at room temperature

Because it is not involved in the reaction

Because it is in its standard state

Because it is a noble gas

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is necessary to calculate the enthalpy of reaction?

The color of the reactants

The volume of the reaction container

The enthalpies of formation of reactants and products

The speed of the reaction

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the calculation of enthalpy of reaction, why is it important to use the correct phase of a substance?

Because the phase affects the speed of the reaction

Because the phase affects the enthalpy of formation

Because the phase affects the pressure of the reaction

Because the phase affects the color of the substance

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the enthalpy of formation for glucose as a solid?

-285.8 kJ/mol

-393.5 kJ/mol

-1,260 kJ/mol

0 kJ/mol

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the final calculated enthalpy of reaction for the combustion of glucose?

-2,815.8 kJ/mol

-1,260 kJ/mol

-4,075.8 kJ/mol

-1,714.8 kJ/mol

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it important to remember the signs when calculating enthalpy of reaction?

Because they affect the final enthalpy value

Because they determine the color of the reaction

Because they change the phase of the reactants

Because they alter the speed of the reaction