Hey there! :D
Which of the following is a chemical change?
A <em>chemical change </em>is a change that alters the makeup of a substance or something. It changes what it is made of. You cannot alter chemical changes.
Boiling water can go back to regular room temperature water. This is not a chemical change.
Melting a cube of ice is not a chemical change. We can freeze the water again to make it ice.
Dissolving 10 grams of salt in water is not a chemical change. You can boil the water and split the salt and water. People do this with Ocean water, to make it drinkable.
Splitting water into hydrogen and oxygen is a chemical change. You change the makeup of the water. It is now separate hydrogen and oxygen. It is not water anymore. "D" is the answer.
I hope this helps!
~kaikers
Explain how a change in thermal energy causes matter to change from one state to another. Give two examples
when thermal energy is absorbed or released it changes the state of matter from one state to another. melting ice and freezing a liquid are examples
Answer:
(R = 8.31 J/(mol · K)) 0.88 × 104 J/mol 1.42 × 102 J/mol 1.42 × 104 J/mol at 600 K and 6.2 × 10-4 L/(mol · s) at 900 K. Calculate the activation energy.