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Ne4ueva [31]
3 years ago
5

Iron and aluminim are examples of _________. a. pure substances b. compounds

Chemistry
2 answers:
Ierofanga [76]3 years ago
8 0

Answer:

compounds

Explanation:

Sindrei [870]3 years ago
8 0
A. Pure substances

Iron aluminum, silver, and gold are all examples of a pure substance. Substances that are free from any kind of mixture and contain only one kind of particle are pure substances.
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How many moles of cl- ions are needed to completely combine with 0.25 moles of mg+2 ions? 0.175 0.75 0.50 0.25 0.125?
Solnce55 [7]
When magnesium ions and chloride ions form a compound the chemical formula would be MgCl2 which means that for every 1 atom of Mg+ there would be 2 atoms of Cl- bonded. This would be proportional to units of moles.

Moles Cl- = 0.25 mol Mg2+ ( 2 mol Cl - / 1 mol Mg2+) = 0.50 mol Cl- would be needed
6 0
4 years ago
A gas occupies 25.3 at pressure of 790.5 mmHg. Determine the volume if the pressure is reduced to 8.04 mmHg
taurus [48]

Answer:

2487.51.

Explanation:

As per Boyle's law temperature remaining constant the volume of an ideal gas is inversely proportional to its pressure.

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therefore, p1V1 = p2V2

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this means that

25.3×790.5 = 8.04V2

⇒V2= 2487.51

Hence, the required volume is, 2487.51.

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