Exploring Enthalpy and Calorimetry Concepts

What is the primary use of Hydrochloric Acid in industries?

• As a cleaning agent

• In the production of fertilizers and dyes

• As a fuel additive

• For water purification

What is formed when Hydrochloric Acid and Sodium Hydroxide react together?

• Sodium metal

• Chlorine gas

• Hydrogen gas

• Salt and water

What type of reaction occurs when Hydrochloric Acid and Sodium Hydroxide are mixed?

• Combustion reaction

• Decomposition reaction

• Neutralization reaction

• Synthesis reaction

What does Hess's Law state about chemical reactions?

• All reactions are exothermic

• Pressure has no effect on the reaction

• The enthalpy change is independent of the reaction pathway

• The reaction rate depends on temperature

What is the purpose of a calorimeter in chemical experiments?

• To calculate the concentration of solutions

• To measure the volume of gases

• To measure the change in heat during a reaction

• To determine the pressure of a system

Tags

NGSS.HS-PS3-4

What is the significance of specific heat capacity in calorimetry?

• It determines the color of the reaction mixture

• It measures the electrical conductivity of the solution

• It indicates the amount of heat required to raise the temperature of a substance

• It calculates the volume of gas produced

Tags

NGSS.HS-PS3-4

What safety precaution is mentioned for handling the thermometer during the experiment?

• Keeping the thermometer in a vertical position

• Using a digital thermometer

• Not stirring with the thermometer

• Wearing gloves

Why is water's specific heat capacity considered high?

• Because it is a universal solvent

• All of the above

• Because it can absorb a lot of heat without a significant change in temperature

• Due to its low molecular weight

Tags

NGSS.HS-ESS2-5

Why might there be a difference between experimental and theoretical values in calorimetry?

• Incorrect temperature measurements

• Because of the heat capacity of the calorimeter not being accounted for

• Due to the specific heat capacity of water

• All of the above

Tags

NGSS.HS-PS3-4

What does the negative value of enthalpy change indicate in a chemical reaction?

• The reaction is endothermic

• The reaction is exothermic

• No heat is exchanged

• The reaction cannot occur