Energetics

What type of a reaction is the following?

HNO₃ + KOH --> KNO₃ +H₂O

• endothermic and decomposition

• Exothermic and single displacement

• Exothermic and neutralisation

• Endothermic and neutralisation

Tags

NGSS.HS-PS3-4

the following diagram shows the energy profile for the reaction between sodium hydrogen carbonate (NaHCO₃) and Hydrochloric acid.

find the correct relationship between the type of the reaction and statement about energy of reactants and products.

• endothermic - products have more energy than the reactants

• exothermic - products have less energy than the reactants

• exothermic-products have more energy than the reactants

• endothermic - products have less energy than the reactants

Tags

NGSS.HS-PS1-4

what is the WRONG statement regarding the following energy profile?

• Energy is given out during the reaction.

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

• The reaction is endothermic.

• D The temperature increases during the reaction.

Tags

NGSS.HS-PS1-4

Which reaction is endothermic?

• acid neutralising alkali causing a temperature increase

• adding magnesium to hydrochloric acid

• calcium carbonate decomposing when heated

• combustion of fossil fuels

Tags

NGSS.HS-PS1-4

A metal reacts with an aqueous solution. The graph shows the temperature before, during and after the reaction.

which answer describes the reaction

• combustion -exothermic

• combustion-endothermic

• thermal decomposition -endothermic

• thermal decomposition -exothermic

Tags

NGSS.HS-PS1-4

which reaction is endothermic?/

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which statements about exothermic and endothermic reactions are correct?

1 During an exothermic reaction, heat is given out.

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

3.Burning methane in the air is an exothermic reaction.

• All

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Tags

NGSS.HS-PS1-4

Solutions of two chemicals are mixed. A reaction occurs and the temperature change is measured. Which statement is correct?

• If the reaction is endothermic, the temperature decreases and energy is taken in.

• If the reaction is endothermic, the temperature increases and energy is given out.

• If the reaction is exothermic, the temperature decreases and energy is given out.

• If the reaction is exothermic, the temperature increases and energy is taken in.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

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.

• The powder dissolves in the water.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A diagram for the energy change during an exothermic reaction is shown.

For which reactions would this be an appropriate diagram?

1. CH₄ + 2O₂ → CO₂ + 2H₂O

2. 2H₂ + O₂ → 2H₂O

3. C + O₂ → CO₂

• 1 and 2

• 2 and 3

• 1 and 3

• All

Tags

NGSS.HS-PS1-4