A pupil heated 1.24 g of copper carbonate strongly. The chemical reaction which took place is represented by the equation:

CuCO3(s) → CuO(s) + CO2(g)

He then heated the 0.80 g of solid again. When he weighed it after cooling, its
mass was still 0.80 g. Explain why it had not changed in mass this time.

After the solid which remained had cooled, he weighed it.

He found that its mass was 0.80 g.

(i) Why did the pupil find a decrease in mass in this experiment?

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso

How many moles of na2s2o3 are needed to react with 0.12mol of cl2? show work.