Exothermic and Endothermic Diagrams

O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• It is an exothermic reaction

• It is an endothermic reaction

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

This is when heat is absorbed, it is an

• Exothermic reaction

• endothermic reaction

• both

• none

Tags

NGSS.HS-PS3-4

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

• It is an exothermic reaction

• It is an endothermic reaction

• It is made of ice

• It is dissolving your mouth

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What type of reaction is this?

• Exothermic

• Endothermic

• Energy Producing

• No way to tell

Tags

NGSS.HS-PS1-4

_____ reactions usually feel hot!

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-5

One type of cold pack uses ammonium nitrate dissolving in water to produce a cooling effect.

• It is irreversible

• It is exothermic

• it is endothermic

• it is explosive

Tags

NGSS.HS-PS1-4

When solid sodium hydrogen carbonate is added to a solution of citric acid in water, a chemical reaction takes place. This reaction changes the temperature of the water, which may be measured with a thermometer as shown in the diagram. If enough sodium hydrogen carbonate and citric acid are present, the change in temperature may convert the liquid water to a different state of matter. Why does this reaction change the temperature of the water?

• The reaction is endothermic because bonds in the products are stronger in total than those in the reactants.

• The reaction is endothermic because bonds in the products are weaker in total than those in the reactants.

• The reaction is exothermic because bonds in the products are stronger in total than those in the reactants.

• The reaction is exothermic because bonds in the products are weaker in total than those in the reactants.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The thermal decomposition of calcium carbonate proceeds according to the equation: (pic)

The reaction enthalpy is +110 kJ/mol. Is the thermal decomposition of calcium carbonate endothermic or exothermic?

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

Which of the following diagrams represents an exothermic reaction?

• A diagram where the products have lower energy than the reactants

• A diagram where the products have higher energy than the reactants

• A diagram with a flat energy line

• A diagram with no energy change