When milk spoils and turns yellow–white, is this a chemical or physical change?

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.