Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.
The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry in the balanced chemical equation represents the number of moles of respective element.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
given number of atoms of copper =6×10⁶atoms
Substituting the values
mole of copper=6×10⁶÷ 6.022×10²³
moles of copper = 9.96×10⁻¹⁸moles
Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.
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The water with no solutes result in increasing the freezing point of the ice cream.
The ice cream has been the frozen constituents of the water. It has been kept in the water at the lower temperature.
The water for keeping the ice cream has been constituted of no solute. The absence of solute in the water has been responsible for the higher freezing point of the solution.
The ice cream has been kept at the freezing temperature. The water has no solute dissolved.
Thus, the freezing temperature of water has been higher than the freezing temperature of water with solutes.
Thus, the water with no solutes result in increasing the freezing point of the ice cream.
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Why can physical changes separate the components of a mixture but not the components of a compound?
Several types of mixtures can be separated by physical means. Heterogeneous mixtures imply the different parts are not equally distributed, much like how on a pizza the toppings are not located in the crust. A homogeneous mixture is one where the components are equally mixed, such as orange juice or lemonade (excluding the pulp).
A common heterogeneous example is to separate oil from water by placing the mixture into a separation funnel and draining one level of liquid out. You then have the two separate components. Basically, if you can see the different layers in a mixture, you can physically remove them by either picking out the solids (either with your hands or running the mixture through filter paper) or for liquids using the funnel.
Answer:
A. Le Chatelier's principle
b. silicon
c. silver
d. argon
The most reactive element among the options is iodine. The Option A.
Iodine is the most reactive element in this list because it belongs to the halogen group of elements in the periodic table, which is known for its high reactivity.
Halogens readily form compounds by gaining electrons to achieve a full outer electron shell. Iodine, with its seven valence electrons has a strong tendency to gain one more electron to achieve stability.
This makes it highly reactive especially when it comes into contact with elements that readily lose electrons such as metals.
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Answer:
iodine
Explanation: