Table of Contents
- 1 Why mixing of cement with water is considered as irreversible change?
- 2 What happens if water is added to cement?
- 3 Why mixing sand and water is an example of physical change?
- 4 Is oil and water mixing a reversible or irreversible change?
- 5 When water is added to cement it Emmits significant amount of heat which is called as?
- 6 Is mixing sand and water a reversible or irreversible change?
- 7 Is mixing sand with water a reversible or irreversible change?
- 8 How does the strength of cement concrete develops with hydration?
Why mixing of cement with water is considered as irreversible change?
Explanation: Mixing cement with water is an irreversible change because we cannot get back the original cement even after boiling it. It is a chemical change.
Is mixing water and cement a chemical change?
Water and cement initially form a cement paste that begins to react and harden (set). This paste binds the aggregate particles through the chemical process of hydration. In the hydration of cement, chemical changes occur slowly, eventually creating new crystalline products, heat evolution, and other measurable signs.
What happens if water is added to cement?
When water is added to cement, the chemical reaction called hydration takes place and contributes to the final concrete product. The calcium silicates contribute most to the strength of concrete. Tricalcium silicates are responsible for most of the early strength (first seven days).
Why mixing sand and water is a physical change?
How is mixing sand and water a physical change? – Quora. It is a physical change since the molecular properties of neither compound is changed. They can be separated with no change.
Why mixing sand and water is an example of physical change?
Water has a strong surface tension, so adding it to the sand creates a strong enough bond for the sand to cling together instead of falling apart. What makes this different from a chemical reaction is that the sand and the water, though mixed together, do not change their molecular structure.
Is cement and water irreversible?
no,because cement doesn,t change in to it original form . the mixing of water with cement is a irreversible change because when the water comes in contact of cement there is a chemicals reaction due to which the cement becomes tight and when it is soaked the water evaporates leaving the hard cement behind .
Is oil and water mixing a reversible or irreversible change?
Explanation: Mixing oil and water is not a chemical change, because they do not react chemically. You can separate the individual components of the oil-water mixture by physical means.
Is mixing sand and water a reversible change?
Correct answer: A mixture of sand and water is the best example of heterogeneous mixture. A mixture in which the composition is not uniform throughout the mixture then it is said to be a heterogeneous mixture.
When water is added to cement it Emmits significant amount of heat which is called as?
exothermic reaction heat
Detailed Solution. When water is added to cement, heat is generated as an end product. It is an exothermic reaction heat, which is a reaction that emits heat.
What is meant by hydration of cement?
The chemical reaction between cement and water is known as hydration of cement. The reaction takes place between the active components of cement (C4AF, C3A, C3S and C 2S) and water. Hydration Of Cement. The chemical reaction between cement and water is known as hydration of cement.
Is mixing sand and water a reversible or irreversible change?
The sand can be separated from the water by simple filtration and can be obtained in its original condition after drying. Since, we can get back initial substance (sand & water) separately from the mixture, so this process is a reversible one.
What happens when cement is mixed with water?
The mixing of cement with water an irreversible chemical reaction will take places, with respect of fineness of cement vs Hydration. The strength of cement concrete or mortar develops with Hydration. more the rate of Hydration faster development of Strength. Finer cement higher the rate of hydration & so faster the development of strength.
Is mixing sand with water a reversible or irreversible change?
Mixing sand with water is a reversible change because after boiling the solution we can get back the sand as the water gets evaporated and the sand is left behind. It is a physical change 2. Mixing cement with water is an irreversible change because we cannot get back the original cement even after boiling it. It is a chemical change.
Is the setting of plaster of Paris on mixing water reversible or irreversible?
Thus, the setting of plaster of Paris on mixing water is an irreversible change. When water is added to cement, it sets into a hard mass after sometime, the setting of cement on mixing with water an irreversible change.
How does the strength of cement concrete develops with hydration?
The strength of cement concrete or mortar develops with Hydration. more the rate of Hydration faster development of Strength. Finer cement higher the rate of hydration & so faster the development of strength. This is because finer cement offer great surface area of particles of hydration.