A solution was prepared by dissolving 2.6061g of sodium carbonate in distilled water and making it up to 250cm3. A 25cm3 portion of the solution was titrated against hydrochloric acid. The equivalence point was reached when 18.7cm3 of the acid was added. Calculate the concentration of the hydrochloric acid in mol dm-3 and g dm-3.

Compare and contrast physical changes with chemical changes.

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?