How many moles of iron in a sample that contains 7.91 x 10^23 atoms of iron?

When using a manometer to check boyle's law, why is the pressure changed slowly? a. to avoid compressing the liquid b. to avoid compressing the gas c. to avoid changing the gas temperature d. to avoid changing the mass of the gas

A gold nugget has a volume of 4.35cm and a mass of 84.96g. What is its density?

Which conditions would result in the worst soil for growing crops? A. moderate rainfall and no extreme temperatures B. a lot of rainfall and low temperatures C. a lot of rainfall and high temperatures D. little rainfall and high temperatures

Which of the following are pure substances? Explain. (a) Calcium chloride, used to melt ice on roads, consists of two elements, calcium and chlorine, in a fixed mass ratio. (b) Sulfur consists of sulfur atoms combined into octatomic molecules.

What is the name of the scientist who discovered that atoms have positive charges

Copper consists of two naturally occuring isotopes. their masses are 62.930 amu and 64.928 amu. calculate their abundances.

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.

One mole of calcium ions has the same number of representative particles as which of the following? one mole of calcium nuclei one mole of calcium atoms 6.02 x 1023 calcium ions All of these are correct.