rBC Reactions and Energy Review

When the atoms of one or more substances rearrange to form one or more new substances.

• Chemical reaction
• Thermal Energy

• Product

• Reactant

A reaction where energy exits the reaction system; the reaction feels warm.

• Endothermic reaction
• Chemical reaction

• Thermal Energy

• Exothermic reaction

A reaction where energy enters the reaction system; the reaction feels cold.

• Endothermic reaction
• Chemical reaction

• Thermal Energy

• Exothermic reaction

What a design should not do - the limits

• Constraint

• Reactant

• Product

• Criteria

The starting substances in a chemical reaction.

• Constraint

• Reactant

• Product

• Criteria

The substances produced in a chemical reaction.

• Constraint

• Reactant

• Product

• Criteria

What a design needs to be successful - the requirements

• Constraint

• Reactant

• Product

• Criteria

A type of kinetic energy; the energy of small particles in motion.

• thermal energy
• nuclear energy
• mechanical energy
• potential energy

How do we know a chemical reaction is occurring in the flameless heaters?

• Heat is produced by the physical mixing of materials without any reaction.
• Chemical reactions are indicated by the release of gas bubbles only.
• A chemical reaction is occurring due to the production of heat from the exothermic reaction.

• The reaction is caused by the absorption of heat from the surroundings.

How is energy transferred from the flameless heater to the food?

• Energy is transferred through radiation.
• Energy is transferred through convection.
• Energy is transferred through evaporation.
• Energy is transferred through exothermic reaction