1. You put an unknown substance into a graduated cylinder filled with 60 ml of water. After the substance is submerged, the water level rises to 90 ml, Then,
you measure the mass of your substance. The mass is 25 g. What is the density
of the substance?

2points why do scientists need governmental funding? o a. government politicians ask all the important scientific questions. o b. scientists have to pay taxes to the government on the money they make. o c. the cost of doing scientific research can be very high. o d. the government is controlled by scientists. submit

What are the first three quantum numbers for the electrons located in subshell 2s?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.