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

If a solution containing 55.42 g 55.42 g of mercury (II) nitrate is allowed to react completely with a solution containing 16.642 g 16.642 g of sodium sulfate according to the equation below.

What happens to nutrients in an organism when a decomposer consumes it

If a 10.0 g mass of aluminum increases from 20.0 °C to 35.0 °C, how much heat was required? (0.903 J/g°C)

1: An ion of magnesium has 12 protons and a charge of + 2. How many electrons are in this ion? A. 2 B. 10 C. 12 D. 14

Two properties a solid compound will not have

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?