Unit 5: Thermochemistry Review

What is the study of the energy changes in a chemical reaction called?

• Thermodynamics

• Thermochemistry

• Chemical kinetics

• Electrochemistry

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the symbol for enthalpy?

• E

• K

• H

• P

Tags

NGSS.HS-PS1-4

Enthalpy is the measure of which types of energy in a chemical species?

• Kinetic and thermal energy

• Potential and electrical energy

• Kinetic and potential energy

• Thermal and electrical energy

Tags

NGSS.HS-PS3-1

During a chemical reaction, when bonds are broken and formed, what happens to the energy?

• It is only absorbed

• It is only given off

• It is either given off or absorbed

• It is transformed into mass

Tags

NGSS.HS-PS1-4

What must happen to the bonds between the H atoms and the bonds between the O atoms in the reaction described?

• The bonds must remain intact.

• The bonds must break apart.

• The bonds must double in number.

• The bonds must change color.

Tags

NGSS.HS-PS1-4

What is formed when new bonds are made in the reaction described in the image?

• Oxygen gas (O2)

• Hydrogen gas (H2)

• Water molecules (H2O)

• Carbon dioxide (CO2)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

According to the image, what is required for the chemical reaction to occur?

• Light

• Energy

• Catalyst

• Pressure

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

What is the change in Enthalpy (ΔH) in a chemical reaction?

• The difference in energy between reactants and products

• The sum of energy of products and reactants

• The energy required to break the bonds in reactants

• The energy released when new bonds form in products

Tags

NGSS.HS-PS1-4

How is the change in Enthalpy (ΔH) measured?

• In joules (J)

• In kilojoules per mole (kJ/mol)

• In calories per mole (cal/mol)

• In watts (W)

What is the formula for calculating the change in Enthalpy (ΔH)?

• ΔH = H_reactants - H_products

• ΔH = H_products + H_reactants

• ΔH = H_products / H_reactants

• ΔH = H_products - H_reactants

Tags

NGSS.HS-PS3-1