Which substance will need 309 J of heat to warm 30g of the substance by a total of 25 °C?

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!

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