Energetics

Neutralisation reactions always....

• stay the same temperature

• decrease in temperature

• increase in temperature

• Increase at first and then decrease at the end

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A minus figure in an enthalpy change is....

• a mistake

• sometimes caused by the wrong reactants

• no significance

• tells you it is an exothermic reaction

Tags

NGSS.HS-PS1-4

Energy level diagrams show the ..........

• products lower in an endothermic reaction

• products higher in an endothermic reaction

• reactants and products the same level

• reactants lower in an exothermic reaction

Tags

NGSS.HS-PS1-4

The _________________ of an exothermic reaction increases

• temperature

• reactants

• products

• concentration

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What kind of reaction is this?

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

Endothermic reactions are shown as ___________ because heat energy is added to the reaction

• negative

• neutral

• positive

Tags

NGSS.HS-PS1-4

Is Evaporation endo or exothermic?

• endothermic

• exothermic

Which of the following is true about the formation of bonds between molecules?

• Energy is given off when bonds are formed between molecules.

• Energy is absorbed by the molecule when bonds are formed.

• Energy is neither given off nor absorbed when bonds are formed.

Tags

NGSS.HS-PS1-4

Which of the following statement is true about the breaking of bonds between molecules?

• To break a bond between molecules, energy must be released by the molecule

• To break a bond between molecules, no energy is needed.

• To break a bond between molecules, energy must be absorbed by the molecule.

Tags

NGSS.HS-PS1-4

An example of an endothermic reaction is......

• burning

• neutralisation

• thermal decomposition

• metal and acid reactions

Tags

NGSS.HS-PS1-4