Answer:
1.If you heat the water, all of its molecules will begin to move around quickly, making it an even more efficient solvent. When you mix water and coffee, the water will dissolve the different flavor compounds in coffee
2. When you mix water and instant coffee, a physical change occurs. The coffee solids are dissolved and suspended in the water. Physical changes can often be reversed, while many chemical changes cannot be reversed.
3. The same happens when you put coffee granules or powder into hot water. The coffee granules are made from particles of a substance which is brown. When coffee dissolves it does not stop being brown. As a result, unlike sugar, which is transparent, the coffee particles make the water brown.
4.The combination of salt and vinegar creates sodium acetate and hydrogen chloride. This chemical reaction will take an old penny and shine it like new. ... If water is introduced to the mix or the penny is left soaking in the salt/vinegar solution, it will corrode quickly and turn green.
5.answer same sa number 4 ✌
6.The acetic acid of the vinegar reacts with the salt, or sodium chloride, to produce sodium acetate and hydrogen chloride. Hydrogen chloride is a strong acid and when combined sodium acetate they rapidly clean the surface of the penny.
7.Water will not do this so the oil is forced to stay separate from the water.
8.Observations and results
First you should have noticed that when you added the oil to the water they did not mix together. Instead the oil created a layer on the surface of the water. This is because oil is less dense than water and therefore it floats to the surface
9.The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water.
sorry 1-9 lang kaya ko ✌｡^‿^｡
comment ko nlng 10-15｡^‿^｡
