8. Look at the graph below and answer the following questions. What is the speed of runner B at 100 seconds?
b. For how many seconds has runner A run at the 300-
meter position?
Make a sketch of
this graph in your
Position vs. Time for Two Runners
notebook. Add a
fine to the graph
Hunter
that represents a
third runner who
has a speed that is
slower than the
Runner
speeds of runner A
and B. This new
line should begin
at the origin of the
graph.

pla·gia·rism

/ˈplājəˌrizəm/

learn to pronounce

noun

the practice of taking someone else's work or ideas and passing them off as one's own.

explanation:

gas and precipitate r the correct answers

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.