Jack lives in a small city in the pacific northwest, where the temperatures are cool all year and the sky is frequently cloudy and rainy. at his town meeting, the mayor of jack's town unveils his plan to change the city's energy to solar energy. what concern should jack raise about this plan? a. solar energy burns high levels of fossil fuels, which harm the environment. b. the city's climate may lower the efficiency of the solar panels c. solar energy is not renewable, so it will deplete natural resources d. geothermal plants will need to be built, which are very expensive.

the objects have the same charge is correct.

nathan lee

answer: - first one is the correct answer. .

explanations: - potassium sulfide is and cobalt(ii) chloride is .

charge on k is +1, charge on s is -2, charge on co is +2 and charge on cl is -1.

in a double replacement reaction the ion exchange takes place. in general the reaction looks like:

if one of the product is insoluble as per solubility rules then a precipitate of it is formed.

when we mix the aqueous solutions of potassium sulfide and cobalt(ii) chloride then chloride ion goes with potassium ion and sulfide ion goes with cobalt ion and the balanced equation is written as:

k and cl has equal charges, similarly co and s has equal charges and hence no subscripts are used for the product side.

as per the solubility rules, cos is insoluble and so it's precipitate is formed.

looking at the given choices, first choice is correct.