Is matter pure?

Answer

Churning causes centrifugal force that separates components based on density. Cream (fat) is lighter and comes to surface, while denser liquid stays below. This proves milk is a mixture, not a pure su

Answer

Mass of solute = 40g, Mass of solvent = 160g, Mass of solution = 40 + 160 = 200g. Mass percentage = (40/200) × 100 = 20%

Answer

A mixture contains two or more components that are not chemically combined and retain their individual properties. Unlike pure substances, mixtures have variable composition and can be separated by ph

Answer

Salt is polar and water is polar ('like dissolves like' principle). Kerosene is non-polar, so polar salt cannot dissolve in it. This creates homogeneous mixture with water but heterogeneous with keros

Answer

More sugar dissolves because solubility increases with temperature. Higher kinetic energy of molecules allows more solute particles to interact with solvent molecules, increasing dissolution rate and

Answer

Heat the mixture in china dish covered with inverted funnel. Ammonium chloride sublimes (solid→gas→solid), deposits on funnel walls. Salt remains in dish as it doesn't sublime at this temperature.

Answer

Milk is a colloid with particles large enough (1-100nm) to scatter light (Tyndall effect). Sugar solution has dissolved particles too small to scatter light, so beam path is invisible.

Answer

Homogeneous: uniform composition throughout (salt water, air). Heterogeneous: non-uniform composition with visible boundaries (oil-water, sand-salt). Homogeneous appears as single phase, heterogeneous