Mechanical energy can be changed into heat energy. true or false

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as