Actually both physical and chemical changes are happening during cement mixing.
Mixing salt and water is a physical change, not a chemical change. The salt does not change its chemical composition when it dissolves in water, only its physical state.
Take this as a note. A mixture is always a physical change, as you can simply evaporate the water and have Urea again. Chemical change always involves the changing of reaction properties amongst its reactants.
Physical change as no new substance is formed and the properties have also not changed. Hope it helps!
Mixing sugar and cinnamon is a physical change, as it does not alter the chemical composition of either substance. A chemical change involves a rearrangement of atoms to form new substances with different properties.
Adding a base to an acid or vice versa in changing the chemical properties of that solution. In both cases you are neuralizing the solution. There might be a physical change as well, but it would depend on what chemicals where mixing. But this reaction will definitely have a chemical change.
No, mixing cement with water and letting it dry is not a physical change; it is a chemical change. When water is added to cement, a chemical reaction occurs, leading to the hardening and setting of the mixture as it forms new compounds. This process is irreversible, distinguishing it from physical changes, which do not alter the chemical composition of the substances involved.
Physical
It depends on what you are mixing it with.
it is a chemical change
physical :)
Mixing salt and water is a physical change, not a chemical change. The salt does not change its chemical composition when it dissolves in water, only its physical state.
both chemical and physical
A simple mixing is a physical process.
A simple mixing is a physical process.
Take this as a note. A mixture is always a physical change, as you can simply evaporate the water and have Urea again. Chemical change always involves the changing of reaction properties amongst its reactants.
chemical
it is a chemical change.