A river passing an industrial plant is suspected of being polluted with lead nitrate (Pb(NO3)2). A method to determine the presence of the substance is to perform a precipitation reaction in which ions displace each other forming an insoluble precipitate. Design an investigation to determine how the distance from the industrial plant influences the colour and amount of precipitate formed when magnesium sulphide (MgS) is added to a river sample.

What is the standard unit of measure for acceleration?

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume

[ou.03jthe pictures below show the wavelengths and intensities of electromagnetic radiations emitted by three stars, star 1, star 2, and star 3. intensity intensity- intensity- 1000 3500 6000 8500 11000 wavelength (a) star 1 1000 3500 6000 8500 11000 1000 3500 6000 8500 11000 wavelength (a) wavelength (a) star 2 star 3 which of these statements is correct about the color of the three stars? star 2 is white in color o star 2 is yellow in color star 1 and star 3 are yellow in color star 1 and star 3 are white in color