Answer:
See explanation
Explanation:
Biology- digestion of food materials
Chemistry- dissolving salt in water
Astronomy - observing day and night
Physics - watching a television
Geography - observing weather changes during the day
Any waves traveling along the medium will reflect back when they reach the end.
Answer:
Alexander Graham Bell
Explanation:
He created the first telephone in 1876.
Answer:
2nd answer
Explanation:
The first answer is wrong because when the gas molecules collide with the walls of the container or with other molecules, there is no loss in the kinetic energy of the gas molecules.
And the third answer is describing a solid.
Answer:
The difference between the energy of the reactants and the energy of the products is called the enthalpy change (∆H) of the reaction. For an exothermic reaction, the enthalpy change is always negative. In an endothermic reaction, the products are at a higher energy than the reactants.
Explanation: