Dok Energetics Questions

The energy level diagram for the reaction between magnesium and hydrochloric acid is shown.

• Energy is given out during the reaction

• The products are at a lower energy level than the reactants

• The reaction is endothermic.

Tags

NGSS.HS-PS1-4

Which statements about exothermic and endothermic reactions are correct?

• During an exothermic reaction, heat is given out

• The temperature of an endothermic reaction goes up because heat is taken in

• Burning methane in the air is an exothermic reaction

Tags

NGSS.HS-PS1-4

Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic?

• A blue solution is formed

• The beaker feels cooler

• The beaker feels warmer

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Exothermic reactions are ones that.....

• Release energy to the surroundings

• Absorb energy from the surroundings

• Remain at a constant temperature

• Decrease in temperature

Tags

NGSS.HS-PS1-4

Neutralisation reactions always....

• stay the same temperature

• decrease in temperature

• increase in temperature

• Increase at first and then decrease at the end

Tags

NGSS.HS-PS1-5

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

• burning

• neutralisation

• thermal decomposition

• metal and acid reactions

Tags

NGSS.HS-PS1-4

endothermic reactions ........

• have more energy in their products

• have less energy in their products

• have more energy in their reactants

• have the same amount of energy in reactants and products

Tags

NGSS.HS-PS1-4

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

NGSS.HS-PS3-1

The amount of energy change in a reaction is known as.....

• endothermic

• Delta H

• exothermic

• Mole/Mass/delta H

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

In the reaction Q = m x c x ∆T, the letter c stands for:

• The change in temperature of the reaction.

• The specific heat capacity.

• The heat energy change.

• The mass of water.