Which of the following is an example of endothermic reaction?

Solid ammonium nitrate dissolved in distilled water

Solid sodium hydroxide dissolved in distilled water

Dilute hydrochloric added to silver nitrate solution

Dilute hydrochloric added to potassium hydroxide solution

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

The surrounding temperature increases during the reaction

The products are more stable than the reactants

The total energy of the reactant is more than the total energy of the products

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

The heat of reaction is -(y-X) kJ

y value increase with the presence of a catalyst

Which of the following is an endothermic reaction?

HCl + NaHCO 3 ---> NaCl + CO 2 + H 2 O

NaCl + AgNO 3 ---> AgCl + NaNO 3

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

Heat is absorbed in the reaction

Total energy of the reactant and the product is 579kJ

The reactant has more energy than the product

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

The energy content of reactant is higher than the energy content of products

Diagram shows the set up of apparatus to determine the heat of precipitation of silver chloride. The temperature of the mixture is rises by 5 0 C . Which solution can be used to replace sodium chloride to get the same rise in temperature?

50 cm 3 of 1.0 mol dm -3 sodium chloride solution

50 cm 3 of 1.0 mol dm -3 magnesium chloride solution

50 cm 3 of 1.0 mol dm -3 barium chloride solution

50 cm 3 of 1.0 mol dm -3 aluminium chloride solution

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

No heat has escape to the surrounding

The chemical formula of the precipitate that is formed

The reaction that take place is exothermic

The number of mole of the reactant is 1 mol

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

Heat Change - Heat is release, Type of reaction - Exothermic

Heat Change - Heat is release, Type of reaction - Endothermic

Heat Change - Heat is absorbed, Type of reaction - Exothermic

Heat Change - Heat is absorbed, Type of reaction - Endothermic

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

Heat is release to the surrounding

The temperature of product is decrease

65kJ of heat absorbed when 1 mol of silver chloride is formed

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

The energy contained in silver nitrate and sodium chloride is higher than the energy contained in silver chloride and sodium nitrate.

Silver chloride precipitate is formed

The reaction needs 65.5 kJ of heat energy to form 1 mol of silver chloride

The total energy absorbed to break the bond is more than the total energy released during the precipitation of silver chloride

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

The temperature of the mixture is increase

The reaction is endothermic reaction

The activation energy is 210 kJ mol -1

The total energy of reactant is lower than the product

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)

The heat release by reacting 0.2 mole of iron(II) ions is 37.8kJ

The temperature decrease during the reaction

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?

Replace aluminium with magnesium

What is the meaning of heat of neutralisation?

The heat change when one mole of water is formed from the reaction between acid and alkali

The heat absorbed when acid react with alkali

The heat released when acid reacts with alkali

The heat change when one mole of salt is formed from the reaction between acid and alkali

which pair produce the highest heat of neutralisation?

sulphuric acid and potassium hydroxide solution

methanoic acid and sodium hydroxide solution

hydrochloric acid and potassium hydroxide solution

ethanoic acid and sodium hydroxide solution

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

Heat is released in this reaction

The product contains more energy than the reactant

OH - ions contain more energy than H + ions

Heat is needed to initiate the reaction

Which of the following neutralisation release least heat?

ethanoic acid and sodium hydroxide

nitric acid and sodium hydroxide

sulphuric acid an sodium hydroxide

hydrochloric acid and potassium hydroxide

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

The heat of neutralisation is -57 kJ mol-1

57 kJ of heat is needed for the reaction

The products of reaction contain more energy than the reactant

The temperature at the end of the reaction is lower than that at the beginning of the reaction

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

Temperature increase during the reaction

The heat of reaction is positive

The energy content of the product of reaction is higher than that of the reactant

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?

stir the water continuously throughout the experiment

Light the wick before placing the lamp under the container

Heat the water in the glass beaker

Thermochemistry Notes

Authored by Charles Martinez

Chemistry

7th Grade

NGSS covered

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57 questions

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MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the meaning of heat of reaction?

The energy needed to break the chemical bond

The energy needed to start the reaction

The energy involved when change of state of matter happens

The change in the energy contained in the products and in the reactants

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

Exothermic- Heat is absorbed, endothermic - Heat is release

Exothermic - Chemical bond is broken, Endothermic - Chemical bond is formed

Exothermic - Temperature of surrounding increase, Endothermic - Temperature of surrounding decrease

Exothermic - Total energy content of product is higher than total energy content of reactant, endothermic - Total energy content of reactant is higher than total energy content of product

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Diagram shows the mercury level of a thermometer in reaction.

Endothermic reaction

Exothermic reaction

Bond breaking in the reaction absorbs energy

The amount of energy in the product is higher than the reactant

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which statement is correct about exothermic reaction?

The heat absorbed during bond breaking is more than the heat release during bond formation

The heat absorbed during bond breaking is less the heat released during bond formation

The heat absorbed during bond breaking is equal to the heat released during bond formation

No heat is absorbed or released during bond breaking and formation

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following absorbs heat from the surrounding?

Adding acid to alkali

Adding concentrated acid to water

Dissolving solid ammonium chloride in water

Dissolving anhydrous copper(II) sulphate in water

Tags

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

Sulphuric acid

Ammonium chloride

Sodium hydroxide

Calcium Oxide

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which process absorb energy?

Evaporation

Combustion

Neutralisation

Displacement

Tags

NGSS.HS-PS1-4

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Thermochemistry Notes

What is the meaning of heat of reaction?

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?

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