Which instrument is used in calorimetry?

Which unit is commonly used for enthalpy change?

Which energy change is shown by ΔH > 0?

Chloe is learning about the system and surroundings in chemistry. She identifies the reaction mixture as the system and everything else as the surroundings. If heat flows from the system to the surroundings, what is the sign of enthalpy change?

Which statement is true for exothermic reactions?

The peak of an energy profile diagram represents:

Yusuf is studying catalysts. He knows that catalysts are used in the Haber process to make ammonia. What is the catalyst used in the Haber process?

Photosynthesis is an example of:

Which reaction needs continuous energy supply?

The heat content of a system is called:

Oliver is studying the effect of catalysts. He knows that catalysts are used in many industrial processes. Which of the following is a characteristic of a catalyst?

A catalyst works by:

The energy profile of an endothermic reaction shows:

Which process requires activation energy?

Khalid is studying endothermic reactions. He knows that dissolving ammonium nitrate in water is endothermic. What happens to the temperature of the solution?

Nora is studying the energy changes in respiration. She knows that glucose is oxidized to release energy. What is the final electron acceptor in aerobic respiration?

Victor is studying exothermic reactions. He knows that combustion reactions are exothermic. Which of the following is an example of a combustion reaction?

Ibrahim is learning about catalysts. He knows that catalysts speed up reactions without being consumed. What is the function of a catalyst?

Which graph shows activation energy?

Ahmed is studying the enthalpy of reaction. He determines that the reaction A → B has ΔH = +100 kJ. What type of reaction is this?

Fatima is studying activation energy. She knows that a catalyst lowers the activation energy. What effect does this have on the rate of reaction?

Bilal is studying a reaction where the temperature of the solution decreases. He feels the beaker and it becomes cold. Based on this observation, what type of reaction is occurring?

Waseem is studying endothermic reactions. He knows that some reactions absorb heat from the surroundings. Which of the following is an example of an endothermic reaction?

Heat of reaction depends on:

Burning of fuel is an example of:

Which reaction has higher activation energy?

Ibrahim is studying the enthalpy of reaction. He knows that the enthalpy change can be calculated using bond energies. If the total energy absorbed in breaking bonds is greater than the total energy released in forming bonds, what is the sign of ΔH?

What happens to surroundings in an exothermic reaction?

What is the heat of reaction?

In an endothermic reaction, ΔH is: