Which of the following is correct about exothermic and endothermic reaction?

Diagram shows the mercury level of a thermometer in reaction.

Which statement is correct about exothermic reaction?

Which of the following absorbs heat from the surrounding?

A pupil discovered that a water container becomes cold when a chemical is dissolved in the water. Which of the following is the chemical?

Which process absorb energy?

Which reaction is endothermic?

Which of the following is an example of endothermic reaction?

Which of the following absorbs heat?

Diagram shows is an energy level diagram. Which of the following can be deduce from diagram.

The diagram shows the energy profile of a reaction. Which of the following is true about the diagram.

Yogurt is prepared by adding 20 cm³ of lime juice into 20 cm³ of fresh milk. It is found that the temperature of the yogurt increases by 2.0 ⁰C. What is the total amount of heat released?(specific heat capacity of water = X Jg^{-1 0}C^-1)

Which of the following is an endothermic reaction?

Diagram shows an energy level diagram for the decomposition of calcium carbonate. Which Statement can be deduce from diagram 4?

Diagram shows the change in thermometer readings for the reaction that occur when two different substance are mixed. What are the substance X?

Diagram shows the observation of an experiment. What is L

Diagram shows an energy level diagram. Which statement correct about the energy level diagram?

Pak Abu's leg was injured during loosening the soil in his farm. Pak Abu asked his son to take substance X from th store and mix it into plastic bag containing water. His son shook the palstic bag and pressed it onto injured part. What is substance X?

Cold pack contain chemicals that react to absorb heat. Which subatance is used in cold packs?

Table shows the temperature change when silver nitrate solution react with different chloride solution. What is X?

Diagram shows the set up of apparatus to determine the heat of precipitation of silver chloride. The temperature of the mixture is rises by 5⁰C . Which solution can be used to replace sodium chloride to get the same rise in temperature?

When 50 cm³ of 0.5 moldm^-3 silver nitrate solution is added to 50 cm³ of 0.5 moldm^-3 sodium chloride solution, temperature of the mixture rises 3.4 ⁰C . What is the heat release in the experiment? [Specific heat capacity of solution :4.2 Jg^-1oC^-1, Density of solution = 1gcm-³]

Diagram shows an energy level diagram for the precipitation reaction of silver chloride. What is the heat release when 14.35g of silver chloride is formed? [RAM Cl:35.5 , Ag :108]

Which of the following must be known to calculate the heat of precipitation in the reaction between silver nitrate and sodium chloride?

The following chemical equation shows the reaction of the formation of lead(II) sulphate precipitate. Which of the following is true about the reaction

The following equation shows the reaction between Ag⁺ and Cl^-. Which of the following is true about the above equation?

The following equation shows the reaction between silver nitrate and sodium chloride. Which of the following shows that the reaction is an exothermic reaction?

Diagram shows the thermometer readings when escess magnesium powder is added to 50cm³ of 0.5 moldm^-3 copper(II) chloride solution in polystrene cup. What is the heat of displacement for the reaction?[ specific heat capacity of water: 4.2 Jg^-1oC^-1, Density of water : 1 gcm^-3]

When excess zinc powder is added to 25cm³ of 0.2 moldm^-3 copper(II) sulphate solution, the temperature increase from 30^oC to 40^oC. What is the heat of displacement of copper?

[ heat capacity of water 4.2 Jg^{-1 0}C^-1,Density of water: 1 gcm^-3]

The following thermochemical equation shows a displacement reaction. based on the equation, which statement is correct?

The equation shows a displacement reaction and its heat of reaction.Which of the following statements are true about the reaction represent by the above equation?(your answer should more than 1)

In an experiment 2.4 g of magnesium powder is added into 100 cm³ of 0.2 mol dm-³ copper (II) sulphate solution. The temperature of the mixture increases by 1.0 ⁰C. What is the heat of reaction in the experiment? [ heat capacity of water 4.2 Jg^{-1 0}C^-1,Density of water: 1 gcm^-3]

The following is thermochemical equation. What is the heat change when 3.2 g of copper is formed in the reaction?

Diagram shows an energy level diagram. What is the increase in temperature of the solution if excess J powder is added to 50 cm³ of T salt solution 0.2 mol dm^-3?[ heat capacity of water 4.0 Jg^{-1 0}C^-1,Density of water: 1 gcm^-3]

In the thermic reaction aluminium is heated with iron (II) oxide to produce vigorous reaction and high heat energy to melt the iron. The molten iron can be used to fix the damage railway track. The following represent the reaction. What should be done to obtain a reaction which release more heat?

What is the meaning of heat of neutralisation?

Diagram shows an energy level diagram of a reaction. What is the type of reaction?

The thermochemical equation represent the reaction between nitric acid and potassium hydroxide solution. What is the heat release when 50 cm³ of 0.2 moldm^-3 nitric acid is added to 25 cm³ of 2.0 mol dm^-3 potassium hyroxide solution?

In experiment 100 cm³ of dilute Hydrochloric acid solution is mixed with 100 cm³ of sodium hydroxide solution in polystrene cup. The concentration of the two solution are the same. During the mixing the temperature of mixture increased by 7⁰C . What is the heat released in the experiment?[ heat capacity of water 4.2 Jg^{-1 0}C^-1,Density of water: 1 gcm^-3]

The reaction between 50 cm³ of 2.0 mol dm^-3 hydrochloric acid and 50 cm³ of 2.0 mol dm^-3 releases 5040 J of heat. What is the temperature change of the mixture?[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1]

The reaction between 25.0 cm³ of hydrochloric acid and 25.0 cm³ of sodium hydroxide solution releases the heat 2100 J . What is the temperature change of the mixture?

[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3]

which pair produce the highest heat of neutralisation?

The reaction between hydrochloric acid and sodium hydroxide is an exothermic reaction. The heat of reaction is 57 kJ mol^-1. Which of the following energy level diagram represent the reaction?

The following is an energy level diagram. What conclusion can be made from diagram?

The following is the energy level diagram of a reaction. Which of the following acid is suitable to replace nitric acid to obtain the same value of heat of reaction?

Which of the following neutralisation release least heat?

Diagram shows the energy level diagram. Based on diagram it can be conclude that

Diagran shows a set up of apparatus to determine the heat of reaction. based on the diagram, which of the following statement is true?

Diagram shows the apparatus set up for an experiment to determine the heat of cmbustion of a fuel. Which of the following are used to determine the heat release of the fuel?

The following thermochemical equation shows a combustion reaction between hexane C₆H₁₄ and oxygen. What is the mass of hexane need to burnt to produce heat that can heat up 2 kg of water from 25 ⁰C to 100 ⁰C? [ RAM C; 12, H: 1 , specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3]

The heat of combustion obtained from an experiment is normally less than the theoretical value. Which precaution can be taken to increase the accuracy of the result?

100 cm³ of water is heated by bruning a sample of ethanol. The heat released by the combustion is 10.5 kJ. What is the maximum increases in temperature of the water?[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3]

The following information shows the result of an experiment to determine the heat change for the combustion of propanol. What is the heat released by the combustion of propanol?[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3]

When 9.0 g of fuel R was burnt, it raised the temperature of 100 cm³ of water by 30 ⁰C. Calculate the heat of combustion of fuel R?[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3 RMM R : 180 g mol^-1]

The table shows the heat of combustion of three alcohols. Which of the following increases the heat of combustion?

The following equation shows the combustion of heptane in excess oxygen. The combustion of heptane releases 1378 kJ of energy. What is the mass of heptane?[ specific heat capacity of water : 4.2 J g^{-1 0}C^-1, density of water = 1gcm^-3] RAM C=12, H=1]