5.1 Endothermic and Exothermic reactions

What is meant by thermochemistry?

• The study of heat change in a physical reaction

• The study of heat change in a chemical reaction

• The chemical reaction that involves the release of heat to the surrounding

• The chemical reaction that involves the absorption of heat from the surrounding

Tags

NGSS.HS-PS1-4

Which of the following represent exothermic reactions?

• Melting

• Photosynthesis

• Respiration

• Neutralisation

Tags

NGSS.HS-PS1-4

What is a measuring device that is suitable to identify endothermic and exothermic reactions?

• spring balance

• potometer

• thermometer

• stopwatch

Tags

NGSS.HS-PS1-4

The diagram below shows the characteristics of endothermic and exothermic reactions. What is represented by X?

• Heat is released

• Heat is absorbed

• Involves physical change

• Involves temperature change

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

50ml of sulphuric acid is mixed with 50ml of potassium hydroxide into a polystyrene cup. Which of the following are related to the activity?

• The polystyrene cup becomes hot

• Heat is released

• Reading of the thermometer decreases

• An endothermic reaction occurs

Tags

NGSS.HS-PS3-4

Which of the following is an endothermic reaction?

• Boiling of water

• Rusting of an iron gate

• Condensation of water

• Photosynthesis

Tags

NGSS.HS-PS1-4

The diagram below shows an experiment to study the change of heat in a chemical reaction. The temperature reading on the thermometer rises. Which of the following is most probably is solution X?

• Potassium hydroxide

• Lemon juice

• Dilute hydrochloric acid

• Carbonated drink

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5

Which of the following tool applies the concept of thermochemistry reaction?

• Match

• Thermos

• Calculator

• Torchlight

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

What is the meaning of thermal equilibrium?

• The reactant and the product have different temperature

• The reactant and the product have the same temperature

• When the final temperature of a mixture still vary

• When the final temperature of a mixture has become constant

Tags

NGSS.HS-PS3-4

Which of the following reaction releases heat?

• Potassium chloride salt with water

• Ethanoic acid with sodium carbonate

• Hydrochloric acid and potassium hydroxide

• Hydrochloric acid and potassium hydrogen carbonate

Tags

NGSS.HS-PS1-4