Sarah and maria made a telephone using two cans and a string. they pulled the string tight and maria went out into the hallway. when maria spoke into her can, sarah could hear her because the sound waves
a) travelled through a vacuum.
eliminate

b) travelled from the cold hallway to the much warmer classroom.

c) travelled from the vibrating can through the string to the other can.

d) travelled through the air from maria to sarah even though they were in different places.

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?