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How many oxygen atoms are in 1.00 kg of oxygen? Answer using scientific notation, so 123 000 000 atoms is 1.23E+8 and 0.000 123 atoms is 1.23E-4. Answer should have at least 2 significant figures.
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One cubic meter (1.00m^3) of concrete has a mass of 2.30E+3kg, and 1.00m^3 of copper has a mass of 8.92E+3kg. Find the radius of an concrete sphere whose mass is the same as that of an copper sphere of radius 1.28cm?
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In chemical changes, new substances are formed. Do the atoms involved actually change? If not, what has changed? How would you help your students visualize this?
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