False. Because though some part of the Earth does have ice, ice is far different from land. As well as I dont think there is even such a thing as an "ice core", by means of other planets. <span />
Answer:
It will heat up until the equilibrium temperature.
Explanation:
Hello,
Based on the initial state, the book was cooled down by the air-conditioned system causing a diminishing in its temperature. Then, as long as it was placed in a balcony that is at the summer day's temperature that is for sure higher than the inside's temperature, it will be heated up causing an increasing in its temperature. Such increasing will proceed until the equilibrium temperature, that is when it remains constant when the time go by.
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Answer:
A substance that is present at the end of a chemical reaction.
Answer:
6.8266x10²³ formula units of Fe₃O₄ are needed
Explanation:
The reaction of Fe₃O₄ with Al occurs as follows
3Fe₃O₄ + 8Al → 4Al₂O₃ + 9Fe
<em>Where 3 moles of Fe₃O₄ react with 8 moles of Al</em>
<em />
To know the number of formula units of Fe3O4 needed for a complete reaction with Al we need to convert the mass of Al to moles in order to find the moles of Fe₃O₄ and the formula units:
<em>Moles Al -Molar mass: 26.98g/mol-:</em>
81.560g Al * (1mol / 26.98g) = 3.0230moles Al
<em>Moles Fe₃O₄:</em>
3.0230moles Al * (3 mol Fe₃O₄ / 8 mol Al) = 1.1336mol Fe₃O₄
<em>Formula units of Fe₃O₄:</em>
1.1336mol Fe₃O₄ * (6.022x10²³ FU / mol) =
<h3>6.8266x10²³ formula units of Fe₃O₄ are needed</h3>
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons.