Is burning a leaf a chemical change or physical change

Magnesium nitride is formed in the reaction of magnesium metal and nitrogen gas. 4.0 mol of nitrogen is reacted with 6.0 mol of magnesium. The result is ... a. 2.0 mol of magnesium nitride and 2.0 mol excess nitrogen b. 4.

Is the reaction below possible? H2O+NaOH=NaCI+H2

The reaction is found to be first order in IO3-, first order in SO32-, and first order in H+. If [IO3-]=x, [SO32-]=y, and [H+]=z, what is the rate law for the reaction in terms of x, y, and z and the rate constant k?

How many unchanged atoms would remain after 3 half-lives if the initial sample had 600 atoms? Explain.

The elements in a star can be determined by analyzing the star's spectrum. Which statement explains why no two elements have the same spectrum? A. Each element has a unique arrangement of electrons. B.

Suppose a variation makes an individual member of a species better adapted to its environment. how might the variation affect the individual's reproduction.

What was the weight percent of water in the hydrate before heating? Put answer in one decimal place. weight of water 0.349 weight of hydrate 2.107

Define meteorologist.

How do decomposers get energy? A. by making their own food B. by eating other organisms C. by converting light energy into chemical energy D. by breaking down the waste materials of dead organisms

Among the following, which is a binary molecular compound? Question 7 options: CO2 NaCl MgS FeO