Some might contain a very small amount.
No, a salt solution is not a pure substance. It is a mixture of salt (solute) dissolved in water (solvent). A pure substance contains only one type of element or compound with a fixed chemical composition.
Virtually none. Most salt contains some magnesium chloride.
Yes - but commercially always contains traces of impurities.
Pure salt is obtained from rock salt through a process called evaporation. Rock salt contains impurities and other minerals that are removed when the salt is dissolved in water and then evaporated, leaving behind pure salt crystals. This process helps to separate the salt from any impurities present in the rock salt.
No, salt water is generally denser than pure water due to the dissolved salt particles increasing the overall mass of the solution. This increased density causes objects to float higher in salt water compared to pure water.
Rock salt contains all the minerals found in the seawater from which it formed. These will be many, but NaCl will be the main one.
Salt water is not considered pure water because it contains dissolved salts and minerals. It is classified as a mixture, where the salt is the solute and the water is the solvent. In comparison, pure water contains only water molecules with no additional substances dissolved in it.
Yes there is salt in chocolate.
Salt is a single compound, but granite contains different compounds. Salt has a single crystal, but a slab of granite contains more than one crystal. Salt contains different compounds, but granite contains different elements. Salt can be dissolved in water, but granite can not be dissolved.
There are many different recipes for hot chocolate but to make a silky, smooth cup of hot chocolate, it is essential to use block chocolate rather than powdered cocoa. Nigel Slater offers a very good recipe on The Guardian's 'Word of Mouth' blog which contains whole milk, grated dark and milk chocolate, a little cream and a little taster of cinnamon and salt.
Pure salt is a compound made from Sodium (Na) and Chlorine (Cl). Its formula is NaCl and it is a pure substance not a mixture. However, most salt you purchase from a shop as' Table Salt' is iodised (for health reasons) and contains anti caking agents (to make it run). That is, it has had iodine other substances added to it. This makes Table Salt a mixture.
no Its a solution. If you mix salt in water, the salt dissolves. It is then a solution. That is not a mixture. It may well be a pure substance. If it is pure salt water it is pure. But if you add some soap it is then pure soapy salt water. What does pure mean? Pure is not a scientific term, so its meaning is debatable. Pure orange juice for instance, has no real meaning as orange juice contains many different things, so how is it pure? In fact if by the previous persons definition of pure, [wood is not but glass is] is incorrect as glass is a compound of several things as is wood. Pure water is a compound of hydrogen and oxygen. So is that pure ,or not?