When does the composition of a substance does not change?

You are handed an opaque, hard rod. In the lab you pull on the ends of the rod. Before it start to stretch, it breaks with an audible 'snap'.

Walter gets a paper back in lab with "-2.75% error" written on it. He found the mass of an object to be 100.7 grams. What should he have found as the mass of the object?

Why was Newland's periodic table rejected?

Which statement about gas effusion is true? A. Lighter gases effuse faster than heavier gases. B. Lighter gases effuse slower than heavier gases. C. Effusion is not related to the molar mass of gases. D. Light and heavy gases effuse at the same rate.

Who wrote the banned book that Giordano Bruno read that gave him the idea that the universe was infinite?

Acetylene is hydrogenated to form ethane. the feed to the reactor contains 1.4 mol h2/mol c2h2. (find properties of the reactants/products in appendix of book) a.

Several properties of the element magnesium are shown. Which one is a chemical property?

How does the quantity of atp produced as a result of activity by the electron transport chain compare to the quantity produced as a result of glycolysis?

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.