Question

Plzzz ans questions 16,17,18,19,20

Answer 1

16) when reactions occur then keep the burning match stick there it will puts off with pop sound

Answer 2

ans 16) zinc sulphate will be formed and hydrogen has will be released
Zn + H2SO4 ------> ZnSO4 + H2

ans 17) dispersed phase. : the phase in a two-phase system that consists of finely divided particles (as colloidal particles), droplets, or bubbles of one substance distributed through another substance — called also discontinuous phase, internalphase.

dispersion medium. : the liquid, gaseous, or solidphase in a two-phase system in which the particles of the dispersed phaseare distributed — called also continuous phase, external phase.

ans 18)
The epidermal peel of onion comprises of rectangular shaped cells.
Each cellcomprises of a nucleus, a central vacuole, thin layer of cytoplasm andcell wall. As cell walls and large prominent vacuole are present in eachcell, the cells placed under observation are plant cells.

ans 19)Staining is an auxiliary technique used in microscopy to enhance contrast in the microscopic image. Stains and dyes are frequently used in biology and medicine to highlight structures in biological tissues for viewing, often with the aid of different microscopes.

ans2o)The melting point of a compound is thetemperature at which it changes from a solid to a liquid. This is a physical property often used to identify compounds or to check the purity of the compound.