Which of the following is not a clue for a chemical change ? A)leaves of the tree changing color
B) rusting of iron
C) fermentation of milk
D) Melting of ice

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

In saturated organic compounds, all the bonds between carbon atoms are called?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive