Why the mass of a rusted nail is greater than the mass of a nail before it rusted? Explain

which of the following comparisons is incorrect? a. Talc is softer than gypsum. b. Feldspar is harder than calcite. c. Quartz is softer than corundum. d. Apatite is harder than topaz.

The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2?

What is the change in electrons for nitrogen in the following reaction? S + NO3 - - > SO2 + NO A. Gain 2 electrons B. Gain 3 electrons C. Lose 2 electrons D. Lose 3 electrons

If Earth was like a hardboiled egg, which part of Earth would the egg shell represent and why? Crust, as its depth is up to 3,000 kilometers Mantle, as its depth is up to 3,000 kilometers Mantle, as its depth is less than 100 kilometers Crust, as

Why does fossil fuel use in the United States make the U. S. vulnerable to the political wishes of foreign countries? a. The US is a net exporter of fossil fuels. b. Fossil fuels lead to global climate change. c.

Why must an air traffic controller know a plane's velocity

Compare and contrast the two kinds of chemical bonds (ionic and covalent)

If a thin and a thick wire are otherwise identical, what property is lower for the thicker wire? 1. current 2. static charge 3. resistance 4. voltage

Which set of numbers gives the correct possible values of l for n = 2?

Light from the sun is absorbed by the ground and converted to what?