Is heat into system positive or negative?
According to the classical sign convention, heat transfer to a system and work done by a system are positive; heat transfer from a system and work done on a system are negative.
What does it mean when Q is negative?
exothermic
Is Melting Chocolate endothermic or exothermic?
endothermic – An endothermic reaction occurs when the elements are absorbing the heat allowing the solution to melt and bond together. Also another time where there is a chemical reaction is when the chocolate is melting in your mouth also known as mouthfeel.
Which one is not a exothermic reaction?
Answer. Explanation: Because when iron pieces are immersed in water,they don’t release any kind of heat or light energy.
Which one of the following is an exothermic reaction?
Solution. In the process of respiration, heat energy that maintains our body temperature is released. Therefore, this process is an exothermic reaction.
Is C o2 co2 a exothermic reaction?
It is an exothermic reaction as heat is evolved during the reaction. It is a combination reaction as carbon combines with oxygen to form carbon dioxide. It is a combustion reaction as carbon is burnt in the presence of oxygen.
Is respiration an exothermic reaction?
Respiration is another exothermic reaction. and this reaction releases energy. If the temperature increases during a chemical reaction then that is an exothermic reaction.
Is the conversion of limestone into quicklime is exothermic reaction?
In case of conversion of limestone into quick lime is a heating process. Due to the heating of limestone, it converted into quick lime, so it is not an exothermic reaction. It is an endothermic reaction.
Which type of reaction is respiration?
decomposition reaction
Which of the following is an exothermic reaction * 1 point?
The reaction of water with quicklime releases a large amount of energy. Hence, this is an exothermic reaction. When concentrated sulphuric acid is diluted with water to obtain dilute sulphuric acid, a huge amount of energy is released. Thus, this reaction is an exothermic process.
What is the other name for quick lime?
Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.
What is free lime in cement?
Calcination of cement raw materials in the kiln produces a material called clinker. Free lime (CaO) in clinkers has to be closely monitored to ensure the quality of cement. Excess free lime results in undesirable effects such as volume expansion, increased setting time or reduced strength.
Which chemical is known as quick lime?
Calcium oxide
What is the pH of quicklime?
12.4