Starch is a polysaccharide.
No, mixing cornstarch with water is not a chemical reaction. It is a physical change. The cornstarch particles disperse throughout the water, but no new substances are formed.
Well, there is no chemical reaction, really, since the cornstarch still remains cornstarch. (and if you dry it, it becomes cornstarch again) It's just that the cornstarch lightly bonds to the water which then lightly bonds to other cornstarch, creating a net-like substance. This net is easily broken and made, thus increasing the viscosity of the fluid and adding some other interesting properties to it as well.
No.
When you mix cornstarch and vinegar together, it is a chemical change. This is because a new substance is formed due to the reaction between the cornstarch and vinegar.
No.
Yes, when cornstarch is mixed with vinegar, it undergoes a chemical reaction. The reaction between the two creates a substance known as a suspension, where the cornstarch particles are dispersed in the vinegar, resulting in a thickened mixture.
Dissolving is a physical process.
It is a physical change.
When vinegar is added to cornstarch, it undergoes a physical change. The vinegar interacts with the cornstarch molecules, causing them to form a non-Newtonian fluid, which changes the physical properties of the mixture.
When sulfur is shaken into cornstarch, the sulfur particles become dispersed within the cornstarch granules. This mixture does not undergo a chemical reaction; instead, it forms a physical blend where the sulfur may affect the properties of the cornstarch, such as its flowability or texture. The resulting mixture can be used in various applications, like in certain types of powders or as an ingredient in chemical reactions. However, the sulfur itself remains chemically unchanged in this process.
Mixing iodine with cornstarch does not result in a chemical reaction. Instead, it forms a physical mixture in which the iodine molecules become trapped within the starch molecules, causing the mixture to change color. The iodine acts as an indicator of the presence of starch.
Kind of tricky question, because on the surface, one might not think that cornstarch and vinegar (acetic acid) don't react chemically. But, in fact, there can be a chemical reaction under the right conditions. So, it would probably be safe to say "chemical" change, if given the chance, but it could also be just a physical change if conditions aren't right.