Answer: 1. When two or more compounds mix, they form a mixture. And water is a mix of hydrogen and oxygen bonded together through chemical bonds. ... It has 2 atoms of hydrogen covalently bonded to one atom of oxygen. This means it cannot be separated by physical means, unlike a mixture.
2. To summarize, evaporation is slower, occurs only from the surface of the liquid, does not produce bubbles, and leads to cooling. Boiling is faster, can occur throughout the liquid, produces lots of bubbles, and does not result in cooling. Evaporation is a normal process that occurs when the liquid form changes into the gaseous form; while causing an increase in the pressure or temperature. Boiling is an unnatural process where the liquid gets heated up and vaporized due to continuous heating of the liquid.For example, a puddle of water will evaporate on a cold day, though the rate of evaporation will be slower than it would be on a warm day. In contrast, boiling only occurs at the boiling point of the liquid. An example of condensation can be seen when drops of water form on the outside of a glass of ice water.
3. a.) Decantation can be used to separate immiscible liquids that have different densities. For example, when a mixture of water and oil is present in a beaker, a distinct layer between the two consistency is formed, with the oil layer floating on top of the water layer. b.) ea leaves can be isolated from tea by the filtration method. c.)Fine mud particles suspended in water – settling down with time or centrifugation. Usually mud particles are dense enough to settle down from water, if the vessel is left undisturbed for some time. But for a faster separation, centrifugation can be opted for which quickly settles down the mud particles as pellet
4. a.) Saturated Solution. A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom. b.) a homogeneous noncrystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension. c.) suspension is a heterogeneous mixture that contains solid particles sufficiently large for sedimentation
5. Homogeneous mixture Heterogeneous mixture
It has a uniform composition It has a non-uniform composition
It has only one phase There are two or more phases
It can't be separated out physically It can be separated out physically
'homo' means the same 'hetero' means different
6. 16 g of sulphur = 16 256 1 16 = moles = 0.125 moles 1 mole of S8 molecules = 6.023 × 1023 number of molecules ∴ 1 16 mole of S8 = 6.023 × 1023 number of molecules × 1 16
7. It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1g of hydrogen gas is 8g. Therefore, the mass of oxygen gas required to react completely with 3g of hydrogen gas is 8 × 3g = 24 g.
