A 2.5600 gram sample of a sulfur-containing compound is analyzed by precipitating the sulfur as BaSO4. If 1.1756 g of BaSO4 are obtained, what is the percentage of sulfur in the sample?

What is true of a reaction that has reached equilibrium? a. the reaction rates of the forward and revers reactions are equal. b. the rate of the forward reaction i sgreater than the rate of the reverse reaction c. the reactio rate is zero d.

Chemical properties include reactivity, flammability, and the ability to rust. True False

Which of these processes indicates that smelting copper is a chemical change a) it involves melting copper to form liquid metal b) it involves heating charcoal to high tempuratures c) it involves drawing copper into long wires d) it involves

The process by which DNA makes a complete copy of itself is called? A) Duplication B) Development C) Transcription D) Replication

How many moles of C6H12O6 are consumed if 6 moles of O2 are consumed?

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?