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liraira [26]
3 years ago
11

A rock is dropped into a graduated cylinder filled with 35 mL of water.

Chemistry
1 answer:
avanturin [10]3 years ago
7 0

Answer:

5 cm³.

Explanation:

From the question given above, the following data were obtained:

Volume of water = 35 mL

Volume of water + Rock = 40 mL

Volume of Rock =.?

The volume of the rock can be obtained as follow:

Volume of Rock = (Volume of water + Rock) – (Volume of water)

Volume of Rock = 40 – 35

Volume of Rock = 5 mL.

Finally, we shall convert 5 mL to cm³.

This can be obtained as follow:

1 mL = 1 cm³

Therefore,

5 mL = 5 mL × 1 cm³ / 1 mL

5 mL = 5 cm³

Thus, we can say that the volume of the rock is 5 cm³.

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Answer:

Explanation:

Isotopes are atoms of elements that have the same atomic number but different mass number hence ISOTOPY. Radioactive Isotopes on the other hand are unstable as they either undergo Alpha decay, beta decay or gamma decay compared to stable isotopes.

Radioactive elements decay at varyinf rates as such the rate of radioactive decay is used in the characterization of radioactive element and mostly expressed in terms of the half life of the radioactive elements.

Half life is the time taken for half of the total atoms of an elements to decay into half of its initial sizes. for example, the half life of radium-226 is 1622 years, it implies that if we have 1000000 radium atoms at the beginning, then at the end of 1622years, 500000 would have disintegrated. These phenomenon can never be experienced by stable isotopes as such they can not be used in carbon dating techniques. reason why uranium-238 is mostly and commonly used in the earth crust to estimate the ages of rocks because it has a half life of 4.5 x 10^9 years.

And also, the radioactive isotopes of most common light element are short, they have very short half life (few days or weeks) and they decay rapidly to vanshing point, as such, they are not found in nature to any reasonable extent.

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What is the octet rule? What is it based on?
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Addition of a catalyst can speed up a reaction by providing an alternate reaction pathway that has a
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Answer:

Addition of a catalyst can speed up a reaction by providing an alternate reaction pathway that has a lower activation energy

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nasty-shy [4]

The ∆Hrxn of the reaction is -394.5kJ/mol.

<h3>What is alkaline earth metal? </h3>

The alkaline earth metals are those elements which correspond to group 2 of the modern periodic table.

All elements of this group forms a cation of +2 charge.

The other elements of this group are:

Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.

<h3>What is Halogen? </h3>

The Halogen elements are present in group 17 of the modern periodic table.

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We have following data of bond energy in kJ/mol:

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Since, one mole of Mg react with one mole of Cl atom to form one mole of MgCl

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∆Hrxn = -394.5kJ/mol.

Thus, we concluded that the ∆Hrxn of the reaction is -394.5kJ/mol.

learn more about bond energy:

brainly.com/question/13526463

#SPJ4

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