Is the following a chemical change or a physical change?

The yolk of an egg, which contains sulfur, causes tarnish to form on silver.

Physical Change

Chemical Change

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia. What is the order of the reaction with respect to ammonia?

Which type of chemical reaction occurs in Ca + Cl2 Right arrow. CaCl2?

The atomic mass of an element is defined as the weighted average mass of that element's? (1) most abundant isotope (3) naturally occurring isotopes (4) radioactive isotopes

Which planet experiences constant daylight or darkness for 42 years at its poles?

Is cotton yarn a natural resource?

What information does the atomic mass of an element provide

The following diagram represents a vertical cross section of sedimentary rock layers that have not been overturned. Which principle best supports the conclusion that these layers have undergone extensive movement since deposition?

What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?

NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed.

What is the general form for the simplest type of acid-base reaction?