What are the three physical properties of a copper penny? a. color, reactivity, density
b. color, mass, oxidation
c. color, reactivity, mass
d. color, mass, shape

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Which of the following are correct values for the ideal gas laws constant r

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution