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Q.7 :Diamond is an element whereas brass is a mixture. Diamond is a molecular form of Carbon which makes it an element as it can exist at room temperature and the pressure in the various forms or allotropes. Where brass is made up of mixing copper and zinc together and have properties of both the alloys.
Q.8: ethyl alcohol is the solvent and water is the solute
Q.9: soap and tin are element because an element is a substance that is one hundred percent uniform throughout and has everything found on the periodic table . they are mixtures.
Q.10 : Solutions are made up of two parts: a solvent and a solute. Solvent – The component that dissolves the other component is called the solvent. Solute – The component that is dissolved in the solvent is called solute.
Q.11: A solution is said to be diluted on the basis of concentration factor. When amount of solute is very very less as compared to the solvent then solution is said to be diluted.
Q.12: A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Q.13: Carbon disulphide is an organic solvent that can dissolve a variety of non-polar compounds. Examples include fats, rubber, resin, iodine, cholesterol, bromine etc.