A crucible contains 6.4 g of copper, Cu. How many moles does this amount contain? [Given: Cu=64]

The balanced chemical equation, Zn (s) + 2 HCl (aq) - -> ZnCl2 (aq) + H2 (g), can be expressed in words as: Zirconium metal plus hydrogen chloride yields zirconium chloride solution and hydrogen gas Xenon solid plus hydrochloric acid yields xenon

Which of the following is the best example of a valid hypothesis? A People should eat vegetables. B Children like Jiffy™ peanut butter better than Skippy™ peanut butter.

A gas mixture is composed of three different gases. The first gas in the mixture has a pressure of 0.35 atm. The second gas in the mixture has a pressure of 0.20 atm. The third gas in the mixture has a pressure of 0.65 atm.

Determine the oxidation number of the element that is underlined within the compound. Li2 SiO3 +2 +4 -2 -4

Isotopes of an element containa. equal numbers of protons and neutrons. b. the same number of protons but a different number of neutrons. c. the same number of neutrons but a different number of protons. d.

If the body is a city what would it be

What is the empirical formula for a compound that is 29.44/% calcium, 23.55% sulfur, and 47.01% oxygen? This compound is a common ingredient in plaster

Through which medium do sound waves travel most slowly?

How are super-absorbent polymers useful in fuel filters? a. They add water to the fuel line to dilute gas. b. They stop excess oil from reaching the engine. c. They repel water to protect the filter from rusting. d.

4. suppose you are setting up a reaction that requires an iodide salt and are planning to use sodium iodide. however, at the last minute you find that you are out of sodium iodide, so you must use potassium iodide instead.