Which of these observations would be classified as a physical property a: lemon juice cleans a penny b: a candle burns brightly c: baking soda in vinegar forms bubbles d: a cube of gold is hammered into a thin sheet

Iwill give extra points to who gets this right

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

What are the similarities of physical and chemical change ?