How many moles are represented by 250g of platinum?

10. Differentiate between Halogens and Noble Gases.

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.

How many valence electrons does chlorine have? does that make it reactive or unreactive? what about sodium?

Identify the correct equilibrium constant expression for this equation: 2NO (g) + O2 (g) + 2NO2 (g)

What happens when light strikes an opaque object? A) All of the light passes through the object. B) All of the light is reflected by the object. C) None of the light passes through the object.

Which would exhibit characteristics of both a metal and a nonmetal? select one: a. si b. ge c. sb d. po e. all of the above exhibit characteristics of both a metal and a nonmetal?

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Which of the following is the most likeley example of an favorable mutation A. A mutation that makes a rabbit able run faster B. A mutation that changes the rabbit's fur to bright orange C. A mutation that changes the color of the rabbit's eyes D.

Which of these mole ratios is possible for this reaction? FeCl3 + 3NaOH → Fe (OH) 3 + 3NaCl 1:1 1:3 3:1 2:3

The chemical equation for reduction of phosphorite Ca3 (PO4) 2