Enthalpy Changes

A reaction that gives out energy to the surroundings causes the

• temperature to drop

• temperature to rise

• temperature to remain constant

• temperature to vary

Tags

NGSS.HS-PS1-5

A reaction that causes the temperature of the surrounding to drop is

• endothermic

• exothermic

• displacement

• oxidation

Tags

NGSS.HS-PS1-4

The enthalpy change when reactants in their standard state are converted to products in their standard state, the whole process taking place under standard conditions.

Identify the correct enthalpy.

• Combustion

• Formation

• Standard

• Ionisation

Bond making and bond breaking. Which of following is TRUE?

• During bond breaking, heat is absorbed

• During bond making, heat is absorbed

• During bond breaking, heat is released

• None of the above

Tags

NGSS.HS-PS1-4

• The total pressure of the system

• The volume of the system

• The heat content of the system at constant pressure

• The total mass of the system

Tags

NGSS.HS-PS3-1

Which of the following statements best describes an exothermic reaction?

• It requires a continuous input of energy.

• It releases energy, usually in the form of heat.

• It absorbs energy from its surroundings.

• It does not involve any energy change.

Tags

DOK Level 2: Skill/Concept

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same

• Increase

• Decrease

Tags

NGSS.HS-PS1-4

Exothermic reactions occur when reactants with (a)   ​ potential energy form products with ​ (b)   potential energy, releasing heat in the process.

• higher

• lower

• no

• total

• all the

• equal

• some

Tags

NGSS.HS-PS1-4

Which of the following reactions is an example of an endothermic reaction?

• Combustion of coal

• Neutralisation of an acid and a base

• Photosynthesis

• Respiration

Tags

NGSS.HS-LS1-5

In an endothermic reaction, energy is:

• Released into the surroundings

• Absorbed from the surroundings

• Neither absorbed nor released

• Converted into light

Tags

DOK Level 2: Skill/Concept