Which of these is an example of a chemical changef. methane is burned in air. g. solid gold is melted to make jewelry. h. a bar of copper is stretched into a long copper wire. j. iron is coated with bronze to prevent rusting.

The first element on the periodic table of elements is carbon. a. true b. false

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

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