'Copper pennies' presentation slideshows

Daily Quiz:

Daily Quiz:. Daily Quiz:. An atom of beryllium has how many protons? 4 5 9 13 . Daily Quiz:. 2. An atom of bromine has how many neutrons? 35 45 80 115 . Daily Quiz:. 3. An isotope of uranium has 92 electrons and 144 neutrons. What is the mass number of this isotope? 92 144 236

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Physical and Chemical Changes

Physical and Chemical Changes. How to tell the difference. Physical Change- physical properties change, but the substance is the same Change in what you see but does not produce a new substance Painting a house, cutting hair, ironing shirt, melting water/boiling water.

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