CHEMISTRY HIGH SCHOOL

If 80 grams of Al and 80 grams of Fe2 O3 are combined, what is the maxium number of moles of fe that can be produced?

Answers

Answer 1

Answer:

Answer:

The maximum number of moles of Fe that can be produced is 1 mol

Explanation:

The reaction is this:

2Al + Fe₂O₃ → 2Fe + Al₂O₃

Moles of Al = Mass of Al / Molar mass Al

80 g / 26.98 g/m = 2.96 moles

Mol of Fe₂O₃ = Mass of Fe₂O₃ / Molar mass Fe₂O₃

80 g / 159.7 g/m = 0.500 moles

For sure, with the naked eye, the limiting reagent is the Fe₂O₃ .

1 mol of oxide, produces 2 mol of Fe

So, 0.5 mol of oxide, will produce 1 mol of Fe

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Which object would best be identified by a periodic Doppler shift in a star's spectrum along with a dip in the stars light intensity?a black hole
a nebula
a comment
a planet

Answers

The answer would be a planet. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.

Answer:

D. a planet

Explanation:

I just took the test!!!

Elvis eats a peanut butter sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Elvis plans to go for a run later this afternoon. He is breathing normally. What does he need from the food he ate and the air he breathes so that he can go on his run? How do Elvis' body systems work together to get the molecules he needs into his cells? How do his cells use these molecules to release energy for his body to run?

Answers

Answer:

Explanation:

What role does warm air play in the formation of a thunderstorm

Answers

Thunderstorms are formed due to instability of the air and the presence of moisture. When the sun heats up the Earth's surface, warm air is forced to rise up while cold air sinks. Due to the difference in density, there will be instability in air and thus contribute to the formation of a thunderstorm. I hope this helps.

What happens in the artificial transmutation of an element? Included an example.

Answers

Answer:

Explanation:

In an artificial transmutation, atoms of one element are artificially made to strike other particles with in an accelerator. Usually in an Artificial transmutation, there are particle accelerators that bombard the elements with in them using alpha particles, deuterons etc.

This bombarding causes lodging of certain elements into the targeted nucleus, thereby forming a new and a different element.

For example -

In the first artificial transmutation, Helium nucleus was bombarded on nitrogen nucleus thereby producing new nuclei and a proton.

In an artificial transmutation an element is transformed into another element by being shot by another element or particle. For example if you shoot an alpha particle like Helium at Nitrogen then you transform the Nitrogen into an oxygen and you get Hydrogen as a By-product

Which action of President Thomas Jefferson wasin conflict with his belief in a strict interpretation
of the Constitution?
(1) protesting the impressment of United States
sailors
(2) purchasing the Louisiana Territory from
France
(3) pardoning violators of the Alien and Sedition
Acts
(4) using the United States Navy to subdue the
Barbary pirates

Answers

The right answer for the question that is being asked and shown above is that: "(4) using the United States Navy to subdue the Barbary pirates." The action of President Thomas Jefferson was in conflict with his belief in a strict interpretation of the Constitution is using the United States Navy to subdue the Barbary pirates

What is represented by the dots in a Lewis electron-dot diagram ofan atom of an element in Period 2 of the Periodic Table?(1) the number of neutrons in the atom(2) the number of protons in the atom(3) the number of valence electrons in the atom(4) the total number of electrons in the atom

Answers

The number of Valence electrons are shown so that one can clearly see the electron transfer or sharing that may take place between the atoms.

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