Sound travels the distance of 1.00 meters through a material in 0.003 seconds. what is the material?

Which changes of state do the labels represent? a: b: c:

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Which accurately compares concave and convex lenses?